How to measure go kart tires

How to Read Go-Kart Tire Sizes

Go-karts are light weight racing machines that have a low center of gravity and rely on quick acceleration around apexes through superior handling and tire grip. If you own your own go-kart, equipping it with the optimal tires is of utmost importance. Failing to do so can negatively affect your racing performance.

It’s therefore vital to understand what the optimal tires sizes are for your go-kart. However, before you can do that. you would need to understand where to find the tire size indicator and how to read it correctly.

Where to Find the Tire Size?

As you can see in the picture illustrated below, you can find the go-kart tire size on the outer part of the tire (facing away from your kart). You’ll be able to see 3 numbers in combination. In the example below you are able to see: 10 x 4.50 – 5.

How to Read the Go-Kart Tire Size?

Now that you know where to find the size indicator, it’s time to take a look at what those numbers actually mean. Remember that it’s always going to be a 3 number combination. The example below shows 11 x 6.00 – 5. 

Here is how to quickly read a go-kart tire size. An 11 x 6.00 – 5 go-kart tire is 11″ tall, 6 inches wide and is suitable for a rim diameter of 5 inches.  

For a more in-depth explanation of reading go-kart tires properly, feel free to explore the section below. I’ve included some examples as well, for better understanding.

Tire Height

The first number on the tire (always the highest) indicates the height of the tire in inches. In the example above, the tire height is 11 inches. You’ll commonly find the tire height between 10 – 12 inches. Off-road go-karts on the other hand have much larger tires. It’s also common for the front tires of a go-kart to be slightly smaller as compared to the back.

Tire Width

The second number of your go-kart tires indicates the tire width. In this example the tire has a width of exactly 6 inches. Racing tires are typically between 4 – 9 inches wide. The reason why you’ll always see this number with 2 decimal places is because go-kart tires widths also come in fractional sizes, for example 4.5 or 7.1 inches. Also take note that front tires have a smaller width than the back tires, due to the weight distribution and the increased grip required at the back.

Rim Diameter

The last number on the tire shows the diameter of the rim. From the sample image above you can see that the tires sits on a rim that has a 5 inch diameter. The rims on the front and the back of go-karts usually have the same diameter. Typical rim sizes for racing are between 4 – 6 inches, whereas off-road rims are much larger.

What Type of Tires Are There?

Go-kart tires come in all shapes and sizes and vary depending on their application. Racing go-kart tires for example are usually wet or slicks, which are designed for maximum grip on the race track. 

On the other hand, off-road go-kart tires usually have knobs and are larger, in order to give the kart a higher clearance for climbing uneven terrain. All go-kart tires should indicate the size on the outer side.

Where Can I Find All Tire Sizes?

You may want to find a specific set of tires for your go-kart and need to ensure that your new or replacement tires are the right size. For everyone’s convenience, I’ve created a go-kart tire size chart and database that contains most of the manufacturers tire data. Please feel free to have a look!

About Gerrit

Owner, Researcher, Writer & Editor at

Hi, I'm Gerrit. I have been racing go-karts competitively and recreationally for the past 20 years. Apart from actively growing local karting communities, I run GoKartGuide and write comprehensive articles, guides & reviews about go-kart racing. I race, build, mod, & discuss go-karts whenever I find the time. Thanks for stopping by and enjoy the read!

Go-kart tire size chart - All numbers explained

by Pittalks

The below is the tire size chart of common go-kart tire brands. You can use the search box to find your specific tires’ sizes.

How To Read Any Tire's Size?

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How To Read Any Tire's Size?

If you do not understand what these numbers mean, consult the guide section right below the chart.

Go-kart tire size chart

Click here to download the go-kart tire size chart pdf file for free.

NameItemSizeCircum.WheelTread Depth Type
MAXXIS HT3-W8611112×9.00-634″6″ x 10″0.055″Dirt
MAXXIS PRIME8570410×4.50-531 3/4″5″ x 6″0.125″Dry
MAXXIS PRIME8570611×6.00-533 1/2″5″ x 7.75″0.125"Dry
MAXXIS PRIME8570711×7.10-5 33 1/4″ 5″ x 9″0. 125"Dry
MAXXIS RAPTOR8560410×4.50-5 31 1/2″ 125 mm 0.115"Dry
MAXXIS RAPTOR8560611×6.00-5 34 3/8″ 175 mm 0.125"Dry
MAXXIS RAPTOR8560711×7.10-5 33 3/4″ 175 mm 0.125"Dry
8590410×4.50-5 32 1/2″ 125 mm 0.130" Dry
MAXXIS RAPTOR8590611×6.00-5 34 1/2″ 175 mm 0.130"Dry
MAXXIS RAPTOR8590711×7.10-5 34 1/2″ 175 mm 0.130"Dry
MAXX8594012×4.00-5 36 3/4″ 3″ two piece0.700"Dry
MAXXIS SPORT8572410×4.50-5 31 3/4″ 5″ x 6″ 0. 125"Dry
MAXXIS SPORT8572711×7.10-5 33 1/4″ 5″ x 9″ 0.125"Dry
MAXXIS RAIN TIRE8580410×4.50-5 32″ 5″ x 5.5″ 0.170"Rain
MAXXIS RAIN TIRE8580611×6.00-5 34 3/4″ 5″ x 7.25″ 0.170"Rain
MAXXIS HT38610410.5×4.50-6 32 1/2″ 6 x 6.5″ 0.040"Dry
MAXXIS EL8620410.5×4.50-6 32 1/2″ 6 x 6.5″ 0.100"Dry
MAXXIS EL8620611×6.00-6 33″ 6 x 8.5″ 0.100"Dry
MAXXIS EL8620812×8.00-6 34″ 6 x 10″ 0.100"Dry
MAXXIS SLH85SLH-4.5010×4.50-5 32 1/4″5″ x 6″ 0. 115"Dry
MAXXIS SLH85SLH-6.00 11×6.00-5 33 1/4″ 5″ x 7.75″ 0.115"Dry
MAXXIS SLH85SLH-7.10 11×7.10-5 33″ 5″ x 9″ 0.115"Dry
Vega MCS MCS 450-6 10.5x4.50-6 32 1/2″6" x 6.5".050"/.060"Dry
Vega MCS MCS 600-6 11.5x6.00-633"6" x 8.5".060"/.070"Dry
Vega MCS MCS 800-612x8.00-634"6" x 10".080"/.090"Dry
Vega MCM MCM 450-610.5x4.50-632 1/2"6" x 6.5".050"/.060"Dry
Vega MCM MCM 600-6 11x6.00-633"6" x 8.5".060"/.070"Dry
Vega MCM MCM 650-611.5x6.50-633 1/2"6" x 9. 25".060"/.070"Dry
Vega MCM MCM 800-6 12x8.00-634"6" x 10".080"/.090"Dry
Vega XHEXHE 450-610.5x4.50-634"6" x 5"0.115"Dry
Vega MDHMDH 450-610.5x4.50-632 1/2"6" x 6.5".050"/.060"Dry
Vega MDHMDH 600-611.5x6.00-633"6" x 8.5".060"/.070"Dry
Vega MDHMDH 800-612x8.00-634"6" x 10".080"/.090"Dry
Vega VAHVAH-46 (Front)10x4.60-5 32 1/4″--Dry
Vega VAHVAH-60 (Rear)11x6.00-533"--Dry
Vega VAHVAH-71 (Rear)11x7.10-533″--Dry
Vega Xh4Xh4-46 (Front)10x4. 60-532 1/4″--Dry
Vega Xh4Xh4-71 (Rear)11x7.10-533″--Dry
Vega XM3XM-46 (Front)10x4.60-532 1/4″--Dry
Vega Xh4XM-71 (Rear)11x7.10-533″--Dry
Vega W6 W6 42 (Front)10x4.20-532"--Rain
Vega W6 W6 60 (Rear)11x6.00-533"--Rain
Burris slick 5" sprint 9455XX10x4.50-531 3/4″ --Dry
Burris slick 5" sprint 9715XX11x7.10-533″--Dry
Burris slick 6" oval track9506XX11x5.00-634 1/2″ --Dry
Burris slick 6" oval track9606XX11x6. 00-633"--Dry
Burris slick 6" oval track9816XX11x8.1-6 ---Dry
Burris slick 6" oval track9706XXS11.5x7.0-6---Dry
Burris slick 6" oval track9856XXS11.5x8.5-6---Dry
Burris slick 6" oval track9956XXS11.5x9.5-6---Dry
Burris 5" Treaded Tires95051111x5.0-5---Dirt
Burris 5" Treaded Tires9555XX11x5.50-5---Dirt
Burris 5" Treaded Tires9705XX11x7.0-5---Dirt
Burris 6" Treaded Tires9556XX11x5.50-6---Dirt
Burris 6" Treaded Tires9706XX11. 5x7.0-6---Dirt
Burris 6" Treaded Tires9856XX11.5x8.5-6 ---Dirt
Burris 6" Treaded Tires9956XX11.5x9.5-6---Dirt
Burris 6" Treaded Tires9806XX12x8.00-6---Dirt
Burris QRC TreadsQ9906XX12x9.0-6---Dirt
Dunlop SL1 225681 (front)10x4.50-5---Dry
Dunlop SL1 225685 (rear)11x7.10-5---Dry
Dunlop SL3288865 (front)10x3.60-5---Dry
Dunlop SL3219423 (front)10x4.50-5---Dry
Dunlop SL3288867 (rear)11x5. 00-5---Dry
Dunlop SL3219455 (rear)11x7.10-5
Dunlop RS1303083 (front)10x4.50-5---Dry
Dunlop RS1303085 (rear)11x7.10-5---Dry
Dunlop DF2308863 (front)10x4.50-5
Dunlop DF2308867 (rear)11x7.10-5---Dry
Dunlop DF M309933 (front)10x4.50-5
Dunlop DF M309937 (rear)11x7.10-5
Dunlop DF H309935 (front)10x4.50-5
Dunlop DF H309939 (rear)11x7. 10-5
Dunlop DF S309941 (front)11x5.50-6
Dunlop DF S309943 (rear)11.5x8.00-6---Dry
Dunlop W7306565 (front)10x3.60-5
Dunlop W7306567 (rear)11x4.50-5
Dunlop SL W2293389 (front)10x4.50-5
Dunlop SL W2293391 (rear)11x6.50-5---Wet
Dunlop SL W13309945 (front)
10x4.50-5 ---Wet
Dunlop SL W13309947 (rear)11x6.50-5
Dunlop SL W13309949 (front)11x5. 00-6
Dunlop SL W13309951 (rear)11.5x7.10-6
BRIDGESTONE YLMYLM-45 (front)10.0x4.5-5-5" x 4.5"100mmDry
BRIDGESTONE YLMYLM-71 (rear)11.0x7.1-5-5" x 8.0"160mmDry
BRIDGESTONE YLCYLC-45 (front)10.0x4.5-5-5" x 4.5"100mmDry
BRIDGESTONE YLCYLC-60 (rear)11.0x6.0-5-5" x 6.0"132mmDry
BRIDGESTONE YLCYLC-71 (rear)11.0x7.1-5-5" x 8.0"156mmDry
BRIDGESTONE YDSYDS-45 (front)10.0x4.5-5-5" x 4.5"100mmDry
BRIDGESTONE YDSYDS-60 (rear)11. 0x6.0-5-5" x 6.0" 117mmDry
BRIDGESTONE YDSYDS-71 (rear)11.0x7.1-5-5" x 8.0"150mmDry
BRIDGESTONE YLHYLH-50 (front)11.0x5.0-6-6" x 5.0"115mmDry
BRIDGESTONE YLHYLH-80 (rear)12.0x8.0-6-6" x 8.0"182mmDry
BRIDGESTONE YLFYLF-50 (front)10.5x5.0-6-6" x 4.5"114mmDry
BRIDGESTONE YLFYLF-60 (rear)10.5x6.0-6-6" x 8.0"157mmDry
BRIDGESTONE YJFYJF-65 (front)10.5x6.5-6-6" x 8.0"150mmDry
-6" x 10.0"190mmDry
BRIDGESTONE YLPYLP-4510. 0x4.5-5-5" x 4.5"90mmRain
BRIDGESTONE YLPYLP-6011.0x6.0-5-5" x 7.0"126mmRain
Mitas SRX58538310×4.50-5-5" x 4.5"-Dry
Mitas SRX58538811×7.10-5-5" x 8.0"-Dry
Mitas SRH57437210×3.60-5-5" x 4"-Dry
Mitas SRH57340910×4.50-5 -5" x 4.5"-Dry
Mitas SRH57342811×5.00-5-5" x 4.5"-Dry
Mitas SRH57346711×6.00-5-5" x 6"-Dry
Mitas SRH57344811×7.10-5-5" x 8.0"-Dry
Mitas SRC58361310×3. 60-5-5" x 4"- Dry
Mitas SRC57341510×4.50-5-5" x 4.5"-Dry
Mitas SRC58359811×5.00-5-5" x 4.5"-Dry
Mitas SRC57346911×6.00-5-5" x 6"- Dry
Mitas SRC57345911×7.10-5-5" x 6"-Dry
Mitas SRB57437310×3.60-5-5" x 4"-Dry
Mitas SRB57342010×4.50-5-5" x 4.5"-Dry
Mitas SRB57342911×5.00-5-5" x 4.5"-Dry
Mitas SRB57386711×6.00-5-5" x 6"-Dry
Mitas SRB57346411×7.10-5-5" x 8. 0"Dry
Mitas SRW57347410×4.00-5-5" x 4"-Rain
Mitas SRW57348011×6.00-5-5" x 6"-Rain
LeCont SVASVA CIK MINI (front)10x4.00-5--4.0 mmDry
LeCont SVASVA CIK MINI (rear)11x5.00-5--4.0 mmDry
LeCont SVB CIK OPTIONSVB CIK OPTION (front)10x4.50-5--3.6 mmDry
LeCont SVB CIK OPTIONSVB CIK OPTION (rear) 11x7.10-5--4.0 mmDry
LeCont SVC CIK PRIMESVC CIK PRIME (front)10x4.50-5--4.0 mmDry
LeCont SVC CIK PRIMESVC CIK PRIME (rear)11x7.10-5--4. 0 mmDry
LeCont SV1 SV1 CIK WET (front)10x4.20-5--4.6 mmRain
LeCont SV1 SV1 CIK WET (rear)11x6.00-5--4.6 mmRain
LeCont LH03 LH03 AUS (front) 10x4.50-5
--3.6 mmDry
LeCont LH03 LH03 AUS (rear)11x7.10-5--4.0 mmDry
LeCont LH05LH05 (front)10x4.00-5--3,5 mmDry
LeCont LH05LH05 (rear)11x5.00-5--3,5 mmDry
LeCont 4SLeCont 4S (front)10x4.50-5---Dry
LeCont 4SLeCont 4S (rear)11x7.10-5---Dry
MG FZFZ10x4. 60-5-120 mm-Dry
MG FZFZ11x6.00-5-170 mm-Dry
MG FZFZ11x6.50-5-170 mm-Dry
MG FZFZ11x7.10-5-200 mm-Dry
MG SMSM10x4.60-5-205 mm-Dry
MG SMSM11x7.10-5-205 mm-Dry
MG SHSH10x4.60-5-120 mm-Dry
MG SHSH11x7.10-5-205 mm-Dry
MG SWSW10x4.20-5-130 mm-Rain
MG SWSW11x6.00-5-180 mm-Rain
MG SCSC10x4. 00-5-103 mm-Dry
MG SCSC11x5.00-5
-138 mm-Dry
MG SCWSCW10x4.00-5-103 mm-Rain
MG SCWSCW11x5.00-5-138 mm-Rain
MG RL1RL110 x 4.60 - 5-120 mm-Dry
MG RL1RL111 x 6.00 - 5-180 mm-Dry
MG RL1RL111 x 7.10 - 5-205 mm-Dry
MG RL2RL210 x 4.60 - 5-120 mm-Dry
MG RL2RL211 x 6.00 - 5-180 mm-Dry
MG RL2RL211 x 7.10 - 5-205 mm-Dry
MG RL3RL310 x 4. 60 - 5-120 mm-Dry
MG RL3RL311 x 6.00 - 5-180 mm-Dry
MG RL3RL311 x 7.10 - 5-205 mm-Dry
MG SSSS10 x 4.60 - 5-120 mm-Dry
MG SSSS11 x 7.10 - 5-205 mm-Dry
MG SISI10 x 4.60 - 5-120 mm-Dry
MG SISI11 x 7.10 - 5-205 mm-Dry
MG AZAZ10 x 4.60-5-120 mm-Dry
MG AZAZ11 x 7.10-5-205 mm-Dry
MG SDSD10 x 4.60 - 5-120 mm-Dirt
MG SDSD11 x 6. 00 - 5
-170 mm-Dirt
Hoosier diry oval karting1132510.5 x 5.0 - 632.75"6" x 6.5"-Dirt
Hoosier diry oval karting1160011 x 6.0 - 633"6" x 8.5"-Dirt
Hoosier diry oval karting1180011 x 8.0 - 634"6" x 10"-Dirt
Hoosier diry oval karting1550010.5 x 5.0 - 632.75"6" x 6.5"-Dirt
Hoosier diry oval karting1560010.5 x 6.0 - 633"6" x 8.5"-Dirt
Hoosier diry oval karting1580011 x 8.0 - 634"6" x 10"-Dirt
Hoosier diry oval karting1545610.5 x 4.5 - 632.5"6" x 6.5"-Dirt
Hoosier diry oval karting1560011 x 6. 0 - 633"6" x 8.5"-Dirt
Hoosier diry oval karting1591011 x 9.0 - 634"6" x 10"-Dirt
Hoosier treaded kart1150510.5 x 5.0 - 633.75"6" x 5"-Dirt
Hoosier treaded kart1185011.5 x 8.0 - 6 36"6" x 10"-Rain
Hoosier treaded kart1190011 x 5.5 - 634.5"6" x 6"-Rain
Hoosier treaded kart1190111 x 5.5 - 635.75"6" x 5.5"-Rain
Hoosier treaded kart1192011 x 6.5 - 6 35.5"6" x 6.5"-Rain
Hoosier treaded kart1193011 x 6.0 - 634.2"6" x 6.5"-Rain
Hoosier treaded kart1193912 x 8. 0 - 638.5"6" x 6.5"-Rain
Hoosier treaded kart1194012 x 8.0 - 637.5"6" x 10"-Rain
Hoosier treaded kart1194112 x 8.0 - 637.5"6" x 10"-Rain
Hoosier treaded kart1195011.5 x 9.0 - 637"6" x 10"-Rain
Hoosier treaded kart1196012 x 9.0 - 638.5"6" x 10"-Rain
Hoosier treaded kart1197012 x 9.0 - 638.5"6" x 10"-Rain
Hoosier asphalt oval karting1550010.5 x 5.0 - 633.125"6" x 6"-Dry
Hoosier asphalt oval karting1565611 x 6.5 - 6 34.75"6" x 8.5"-Dry
Hoosier asphalt oval karting2560011 x 6. 0 - 633"6" x 8.5"-Dry
Hoosier asphalt oval karting1580011 x 8.0 - 634"6" x 10"-Dry
Hoosier 5" sprint2214910 x 4.5 - 532"5" x 5"-Dry
Hoosier 5" sprint2215010 x 4.5 - 532"5" x 5"-Dry
Hoosier 5" sprint2215510 x 4.5 - 532"5" x 5"-Dry
Hoosier 5" sprint2218010 x 4.5 - 532"5" x 5"-Dry
Hoosier 5" sprint2225011 x 6.0 - 534"5" x 7"-Dry
Hoosier 5" sprint2226011 x 6.0 - 534"5" x 7"-Dry
Hoosier 5" sprint2236811 x 7.1 - 534"5" x 8. 25"-Dry
Hoosier 5" sprint2237111 x 7.1 - 534"5" x 8.25"-Dry
Hoosier 5" sprint2238011 x 7.1 - 534"5" x 8.25"-Dry
Hoosier 5" sprint2240510 x 4.5 - 532.255" x 4.75"-Rain
Hoosier 5" sprint2243511 x 6.0 - 534.5"5" x 6.75"-Rain
Hoosier super kart 2246010.5 x 4.6 - 633"6" x 5"-Dry
Hoosier super kart 2250510.5 x 5.0 - 633.75"6" x 4.75"-Rain
Hoosier super kart 2255011 x 5.5 - 635"6" x 4.75"-Dry
Hoosier super kart 2265011 x 6. 5 - 634.75"6" x 8"-Dry
Hoosier super kart 2271011.5 x 7.1 - 635.875"6" x 8"-Rain
Hoosier super kart 2280011.5 x 8.0 - 635.875"6" x 8"-Dry
MOJO D2XXD2-XX (front)10 x 4.5 - 5--3.5 mmDry
MOJO D2XXD2-XX (rear)11 x 7.1 - 5--3.5 mmDry
MOJO D2-6D2-6 (front)10 x 4.5 - 5--3.5 mmDry
MOJO D2-6D2-6 (rear)11 x 6.0 - 5--3.5 mmDry
MOJO D5D5 (front)10 x 4.5 - 5--3.5 mmDry
MOJO D5D5 (rear)11 x 7.1 - 5--3.5 mmDry
MOJO W5W5 (front)10 x 4. 5 - 5--5 mmRain
MOJO W5W5 (rear)11 x 6.0 - 5--5 mmRain
MOJO C2C2 (front) 11 x 5.0 - 5--3.5 mmDry
MOJO C2C2 (rear)10 x 4.0 - 5--3.5 mmDry
MOJO CWCW (front)10 x 3.6 - 5--6 mmRain
MOJO CWCW (rear)11 x 4.5 - 5--6 mmRain

How to read Go-karts tire size

The first number – Tire height

The first number indicates the height or diameter of your go-kart’s tires. This number often ranges from 10″ to 12″. Off-road go-karts typically have taller tires than those used for racing. This is because they need more ground clearance to navigate rough terrain.

Smaller tire height also has its own benefits. Lower go-kart tires provide a lower center of gravity. This makes your go-kart more stable and less likely to tip over. In addition, lower tires offer:

  • Less weight
  • Better acceleration (but lower top speed)
  • Better handling
  • And very important, less expensive

Usually, the front tires’ height on go-karts is lower than the rears’.

The second number – Tire width

The second number in a go-kart tire size designation indicates the tire’s width. The range for this number is usually 4″ to 9″.

Wider go-kart tires provide more traction, which will increase your kart’s speed when cornering. This is only true if your go-kart engine is powerful enough. Otherwise, wider tires’ weight and rolling resistance will bog down your engine.

Wider tires also provide better braking because they have a larger contact patch. Again, this is only true if your kart gets a good-enough brake. If not, wider tires may just make your kart harder to stop (because the little calipers can’t handle too much rotational mass. )

The front tires are narrower than the back tires because they don’t need as much grip, and the weight is distributed differently.

You can also notice that wet tires are generally narrower than slick tires. That’s because a higher amount of force per contact surface area helps to move water aside better.

The third number – Rim diameter

The last number in a go-kart tire size is the diameter of the wheel or rim that the tire will be mounted on. The common rim diameter is usually 4″ to 6″. This size is the same for both front and rear tires.

Other numbers you need to know when choosing kart tires


To calculate the circumference of a go-kart tire, this is the general formula:

C = πd


  • C is the circumference in inches
  • d is the diameter of the tire in inches
  • And π is 3.14159

However, as you can see on the size chart above, some tires have the same diameter but different circumferences. Why is this possible?

It’s because the rim width affects the sidewall height, which in turn alters the tire’s circumference.

Rim (or wheel) width

Do not be confused between rim width and tire width. The width of the rim is the distance between the inside and outside of the bead seat.

Usually, this number can be found under this form: A x B

Where A is the rim diameter and B is the rim width.

Because rim diameter is already displayed in tire size (Y x Z – A), you can sometimes only see one number on the section wheel (rim) dimension. That’s also the rim width.

Tread depth

Tread depth is the distance between the top of the tread to the bottom of the deepest grooves.

The higher the tread depth, the better your kart grip on a wet surface. This is because the tread will displace water and avoid skidding.

For that reason, “wet” tires have much higher tread depth than dry (slick) tires. Meanwhile, dry tires have little to no tread to provide the most amount of grip.

According to Jones and Childers’s coefficients of friction report, a slick tire can offer a 0.9 coefficient of friction on a dry surface. But on a wet surface, this number can drop down to 0.1, which is very dangerous.

A deep-grooved tread can offer a 0.4 coefficient of friction on a wet surface and 0.7 on dry.

Final words

I’ve made the table base on the information from those brands’ websites. If there is anything I miss or anything you would like me to explain more, please do not hesitate to leave a comment below.

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Pressure and temperature

Determining the operating temperature of a tire and determining the type of track surface can make your job much easier.
You can determine the temperature of the working surface by analyzing the surface of the tire. If the surface is very smooth, then the tire is not warming up, and if tracks appear on the surface in the form of peeling or bubbles, then the surface is too hot.

If you have already found your ideal tire pressure and the weather is getting colder, you will have to increase the pressure to get the correct tire temperature because the air temperature has dropped and the track temperature has dropped accordingly. The same is true in the opposite direction, since by the middle of the race day the temperature becomes higher than during the morning practice. Your best bet is to monitor your data based on track temperature and record it.

The change in pressure will depend on the number of right and left turns on your track, if their number is the same, then the pressures will be almost the same on the sides.

If you are in an area with high humidity, you will most likely experience problems with temperature and tire pressure. The water content in the air will cause the pressure to rise more. Some use nitrogen in these situations. Do not use soapy water to put the rubber on the rims as the water in the tire will boil and the pressure will build up excessively!

Track the condition of the track and the amount of rubber on the pavement. If the asphalt is smooth, then you must increase the pressure so that the wheel warms up. If there is a lot of rubber on the track, then you will have to lower the pressure so that the wheel does not overheat.

According to manufacturer's recommendations, most kart tires are designed to operate in the 74-85 o C (165-185 o F) temperature range. Keep in mind that tires cool down very quickly once they leave the track surface.
Almost any kart tire will fail when its surface temperature exceeds 93-99 o C (200-210 o F) degrees. Therefore, a kart tire whose temperature is close to the upper limit has the best performance.

Pressure and tread

When working with tyres, you have only two things you can adjust, the pressure and the position of the wheels relative to each other (tread).

How is everything going?
If the tire pressure is initially too high, you will have great grip at the beginning of the race, but then you will lose grip by the middle of the race, and even more so towards the end. With too little pressure, you will need to drive many laps to reach the working pressure of the wheel. You need your tires to warm up for 1-2 laps and the pressure becomes optimal. But this is not easy to achieve.

The first thing to do is to measure the tire pressure immediately after you have finished your race or practice. If your pressure has increased by more than 2 PSI, then you need more air. But, do not pressurize more than 1 PSI during one ride. Drive out again and see how long it takes for the tires to warm up. Further, it is only a matter of trials and your own mistakes. Most often, 16 PSI in front and 18 PSI in the rear are taken as the starting point of reference, then they work with pressure to increase or decrease.

Another parameter you can change is the distance between the wheels. How does this affect grip level?
At the beginning of your race, it can be difficult to identify front and rear hooks, even though it seems easy.
If the rear of the kart has a very good grip, then the kart will not turn properly because the rear wheels will push the kart in a straight line. Adding grip at the front will improve the balance, but when all wheels have too much contact with the track, the motor will need to put more power into cornering. Moving the rear wheels outward will reduce rear traction, move the wheels at the same time, and no more than 5mm apart. Too strong rear grip is characterized by the fact that the kart starts to jump (break) in the turn.

As far as the front wheels are concerned, the operation is just the opposite of the operation with the rear wheels. Pushing the wheels outwards increases front grip. If your kart has too much grip in the front, then when you turn the handlebars, the rear kart will not be able to grip properly and the rear axle of the kart will slide. In principle, it does not take much experience to find the right balance, since one axis strongly influences the behavior of the other.
The best solution is to make changes little by little, and be aware of what results this leads to, also consult other pilots and see what they are doing.

Translation by Dmitry Tsvirko,

Tire size designation |

There are several ways to designate tire size and parameters, some manufacturers use inches, some millimeters, and some even both. The examples below will help you define the parameters yourself.

1. Tire width (cross-sectional width)
2. Tire height
3. Cross-sectional height
4. Rim diameter
5. Tire outer diameter

Example: 3.00-4, 3.50-6, 4.00-8, 5.20-10, 6.00-12….

The first digit (3.00) indicates the tire width. “-” indicates that the tire is bias-ply (a radial design would be R). The last digit (4) indicates the bore diameter in inches. So a 3.00-4 tire fits a 4" rim, is 3" wide, and has a diagonal design.

Example: 6-12, 7-14, 8-16, 9.5-18…

Same as above, but without (.00) in the first part of the size. All dimensions are in inches. It is important that tires with similar sizes may not be compatible - a tire with parameters 6.00-12 can be very different from a tire 6-12. If you doubt the definition of compatibility - contact the managers PROTEKTOR.RU

Example: 4.10/3.50-4, 4. 10/3.50-6, 5.30/4.50-6…

This size consists of 4 parts. The first digit (4.10) indicates the tire width. The second (3.50) indicates the height of the tire. The third digit (4) indicates the fit diameter of the tire. “-” refers to the diagonal design of the tire. So a 4.10/3.50-4 tire is 4.1" wide, 3.5" high, fits 4" rims, and has a diagonal design.

Example: 11x4.00-4, 13x5.00-6, 18x8.50-8, 25x12.00-9…

The first number (11) is the outside diameter of the tire in inches. The second number (4.00) is the width of the tire in inches, and the third number (4) is the rim diameter of the tire. “-” refers to the diagonal design of the tire. So a 11x4.00-4 tire is 11" OD, 4" wide, fits a 4" rim, and has a diagonal design.

Example: 10x3, 18x4, 260x85

This marking is obsolete, but you may still encounter it. Dimensions can be specified in both inches and millimeters (usually it is quite easy to distinguish this). The first number (10) indicates the outer diameter of the tire, the second the width of the tire. The seat diameter is not indicated in the size, but can be easily calculated, since the height of such a tire usually coincides with its width. Thus, an 18x4 tire has an OD of 18 inches, a width of 4 inches, and a rim diameter of 10 inches (18 inches of OD minus 2" x 4" of tire height). The modern designation for such a tire would be the formula 4.00-10. A tire with a size of 260x85 has an outer diameter of 260mm and a width of 85mm, or 10" and 3" respectively, with a 4" bore. The modern designation would look like this: 3.00-4.

Example: 255/60-10, 195/50R13, 420/85R28

The first digit is the tire width in millimeters, the second is the profile height (percentage of the tire width), and the third digit is the bore diameter in inches. If the letter R is present in the size, this means that the tire has a radial design, and “-” indicates a bias. So a 420/85R28 tire has a width of 420mm, an 85% profile (the height of the tire is 85% of the width, i. e. 357mm), a radial construction and fits a 28" rim.

Example: 145R10, 155R12

The first number indicates the tire width in millimeters and the second number indicates the bore diameter (rim diameter) in inches. R indicates a radial construction, “-” indicates a diagonal one. With this marking, the tire profile is not indicated, and by default it is 80%. That is, a 145R10 tire is 145mm wide, 116mm high (80% of 145mm), fits a 10" rim, and has a radial design. The overall tire diameter can be calculated by converting all units of measurement to inches or millimeters and adding the rim diameter to twice the height of the tire.

Currently, the ply rate determines the strength of the tire and does not indicate the number of plies of cord fabric. Originally, the term "ply" did refer to the number of plies of cord fabric and therefore served as an indication of the strength of a tire. But with the development of new materials, the original cotton cord fabric was first replaced by viscose, and now nylon or steel wire is used.

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