Understanding tire measurements can be very tricky and complicated, especially when tires are similar in size but described using different measurements. There is the metric measurement and the imperial or standard measurements and these can become confusing very quickly. So what is the main difference between 35×12.5R17 vs 315/70R17 tire?
The 35” tire represents the overall combined width (mm), aspect ratio (%), and wheel diameter (inches) measurement. The 315 tire measurement is a metric value and only represents the tire width which is measured in millimeters.
The two sizes are almost the same but vary somewhat between tire models and brands. Let’s find out what the exact differences are between the two tires when it comes to size, weight, height, and load ratings.
Let’s go!
Table of Contents
So let’s start with the 315/70R17 tire. This tire measurement means the tire is measured as follows:
315 – The tire width, measured in millimeters
70 – The tire aspect ratio (sidewall) height, measured in percentage
17 – The tires wheel circumference, measured in inches
Let’s see what that looks like in a formula form
Tire Size: 315/70R17 (35”)
As you can see above, the 315 70 17 tire measures 12.4″ wide and 34.362″ tall.
Let’s now see how that differs to a 35/12.5R17
So now we know what the 315/70R17 represents, let’s look at how to read and decipher the 35×12.
5R17 measurement.
When looking at a 35×12.5R17, the 35” measurement represents the overall tire size which includes the width, aspect ratio, and wheel diameter.
The 12.5 represents the section width. The Section width is defined as the measurement between the widest point of the outside sidewall to the widest point of the inner sidewall.
17 represents the wheel diameter, measured in inches.
These two tire sizes might differ slightly in physical dimensions, however, there are factors like load ratings, tire tread pattern, tire molds, etc. that makes the difference. The weight differences can vary between 500g to 1. kg or 1.102 to 2.204 pounds.
| 315/70-17 | 35/12.5-17 | Difference | |
| Diameter inches (mm) | 34.36 (872.8) | 35.03 (889.72) | 0.67 (16. 92) 1.9% |
| Width inches (mm) | 12.4 (315) | 12.52 (318) | 0.12 (3) 1% |
| Circum. inches (mm) | 107.95 (2741.98) | 110.04 (2795.14) | 2.09 (53.16) 1.9% |
| Sidewall Height inches (mm) | 8.68 (220.5) | 9.01 (228.96) | 0.33 (8.46) 3.8% |
| Revolutions per mile (km) | 586.93 (364.7) | 575.77 (357.76) | -11.16 (-6.94) -1.9% |
As you can see in the above table, the differences in aspect ratio (sidewall height) is roughly 3.8%.
The table below will show how the aspect ratio affects the accuracy of your speedo readings.
| Speedo Reading | Actual Speed |
| 20 mph (32.19 km/h) | 20.39 mph (32.81 km/h) |
| 25 mph (40.23 km/h) | 25.48 mph (41.01 km/h) |
30 mph (48. 28 km/h) | 30.58 mph (49.22 km/h) |
| 35 mph (56.33 km/h) | 35.68 mph (57.42 km/h) |
| 40 mph (64.37 km/h) | 40.78 mph (65.62 km/h) |
| 45 mph (72.42 km/h) | 45.87 mph (73.82 km/h) |
| 50 mph (80.47 km/h) | 50.97 mph (82.03 km/h) |
| 55 mph (88.51 km/h) | 56.07 mph (90.23 km/h) |
| 60 mph (96.56 km/h) | 61.16 mph (98.43 km/h) |
| 65 mph (104.61 km/h) | 66.26 mph (106.64 km/h) |
| 70 mph (112.65 km/h) | 71.36 mph (114.84 km/h) |
| 75 mph (120.7 km/h) | 76.45 mph (123.04 km/h) |
| 80 mph (128.75 km/h) | 81.55 mph (131.24 km/h) |
| 85 mph (136.79 km/h) | 86.65 mph (139.45 km/h) |
| 90 mph (144.84 km/h) | 91.74 mph (147.65 km/h) |
| 95 mph (152.89 km/h) | 96.84 mph (155.85 km/h) |
| 100 mph (160.93 km/h) | 101.94 mph (164.05 km/h) |
5R17 vs 315/70R17 – LOAD DifferencesThe load range is just a complicated way of telling you what the maximum number of pounds the tire can comfortably support is. It’s a common misconception that Size and load rating are related however they actually have very little to do with each other. 315/70R17s are also available in C/D/E rages.
As you go up in ratings you get improved load carrying abilities and a beefier tire however due to the stiffer sidewall, offering little flexibility you can sacrifice ride quality and added unsprang weight.
Personally, I am a fan of XL for most 4WD ½ ton trucks and SUV applications. Here the application is key i.e. is it your daily driver or is it used as a work truck etc.
SL – Standard load, normal body ply with regular load capacity, P metric like P255/70R17
XL – Extra load, heavier body ply with high load capacity also P metric
C ply(6) rating, heavier body ply with higher load capacity, LT metric like LT285/70R17
E ply(10) rating, heavier body ply with higher load capacity also LT metric
You can expect 1 to 2 mpg difference when upgrading from 33” to 35“tires.
The larger diameter, width, and circumference add to the unsprang weight which has a direct effect on fuel economy, performance, gearing, and other drivetrain components.
Users who have made the switch have reported a decrease of anything between 1-2mpg when cruising on the highway and 2-4mpg when driving in the city. Of course, the truck’s low-down torque and overall performance outputs play a major factor and figures will vary from vehicle to vehicle.
It’s not uncommon for Jeep Wrangler owners to fit 35” tires, since they have SFA and plenty of options to improve wheel clearance. Of course, re-gearing is key. Once you fit 35s it recommended to go with either the 5.13 or 4.88 gears. Even though frugal gas mileage shouldn’t really be your main concern when driving a 4WD, many JK owners report a drop of between
YES, 315 wide tires are the same as 35” tires although 315 is the tread width in millimeters and 35″ is the tire diameter.
315/70/17 is usually the accepted metric equivalent size for standard/imperial 35-inch tires.
Click here to get more detail on this topic
In most cases when comparing physical differences most 35″ tires hardly crack the 34″ mark in actual tire size. If you find a tire that has both “315” and “35” measurements take a look at load range/speed rating to determine the best fit for your application.
315/70 R17 in inches What rims fit 315/70 R17 tires What is 315/70 R17?
Overall: 91%
Dry: 93%
Wet: 92%
Snow: 88%
Comfort: 88%
Wear: 91%
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Overall: 88%
Dry: 92%
Wet: 91%
Snow: 78%
Comfort: 88%
Wear: 87%
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Overall: 87%
Dry: 92%
Wet: 88%
Snow: 78%
Comfort: 87%
Wear: 89%
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Overall: 84.
5%
Dry: 87.7%
Wet: 96%
Snow: 71%
Comfort: 90%
Wear: 83.5%
Buy again: 100%
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Overall: 82.8%
Dry: 78.7%
Wet: 80%
Snow: 80%
Comfort: 87%
Wear: 90%
Buy again: 97%
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Overall: 82%
Dry: 88%
Wet: 88%
Snow: 85%
Comfort: 86%
Wear: 79%
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Overall: 81%
Dry: 89%
Wet: 88%
Snow: 81%
Comfort: 87%
Wear: 83%
Check on Amazon
Overall: 91%
Dry: 90%
Wet: 89%
Snow: 88%
Comfort: 84%
Wear: 87%
Check on Amazon
Overall: 91%
Dry: 91%
Wet: 88%
Snow: 79%
Comfort: 79%
Wear: 83%
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Overall: 84.
6%
Dry: 85%
Wet: 81.5%
Snow: 94%
Comfort: 77%
Wear: 85.5%
Buy again: 90%
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Overall: 84%
Dry: 89%
Wet: 81%
Snow: 80%
Comfort: 83%
Wear: 86%
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Overall: 80.7%
Dry: 78.3%
Wet: 65%
Comfort: 75%
Wear: 90%
Buy again: 100%
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Overall: 79%
Dry: 84%
Wet: 80%
Snow: 74%
Comfort: 74%
Wear: 73%
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Overall: 73.
6%
Dry: 73.7%
Wet: 75%
Snow: 85%
Comfort: 58%
Wear: 83%
Buy again: 75%
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Best 315/70 R17 All Terrain TiresBest 315/70 R17 Off Road/Mud Terrain Tires
315/70 R17 tires diameter is 34.4 inches, section width is 12.4 inches and rim diameter is 17 inches. So the closest and almost equal metric tire size of 315/70R17 existing size in inches is 35x12.50R17, which is 1.74% taller and 0.81% wider.
Compare 315/70 R17 vs 35x12.50R17 with our handy tire size calculator.
For each tire size there often there are several wheel sizes. You can't put very wide tires on narrow rims or vise versa.
Here is what size of the rims do you need for 315/70 R17 tires:
Rim diameter x rim width
| Parameter | Meaning |
|---|---|
| 315 | The first number shows that the tire has a width of 315 millimeters or approximately 12.4 inches. |
| 70 | The second number is the aspect ratio. In this case, it is 70%. It shows the height of the tire from the ground to rim edge, which is 70% of the width or ~ 221mm |
| R17 | The letter R means this tire is radial. Most of all tires nowadays are radial. The number is the tire diameter in inches. It means that tire will fit 17 inch wheels |
Calculate
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In the table above you can see a detailed comparison of the difference in dimensions, parameters and performance between a 315/70 R17 tire and a 335/70 R17 tire. The results of the calculations are also presented in the form of visual models (infographics), on which the tire with a size of 315/70 R17 is on top, and with a size of 335/70 R17, respectively, at the bottom. The visualization was generated in two projections: lateral (left) and frontal (right). The online calculator compares tires according to the following characteristics: diameter, width, circumference, profile height, revolutions per km, ground clearance change. In addition, the potential deviation between the actual speed and the speed displayed on the speedometer is calculated, which can occur if the difference between tires 315/70 R17 and 335/70 R17 is significant. US and UK inch version of calculations.
If you want to compare other tyres, simply select the required parameters in the drop-down fields and click on the green button.
| Side Comparison | Frontal comparison |
|---|---|
Further development of the proven BF.GOODRICH All-Terrain wheels. The new generation of tires, according to the manufacturer, is the most durable, reliable and durable in the history of the company.
The main differences from the previous series are:
- Increased sidewall strength by 20%, thanks to the use of advanced CoreGard ™ technology - the manufacture of the sidewalls of the tire from the rubber compound used on the Baja T / A® KR2 racing tires, which has increased strength;
- Shoulder zones made of thicker rubber and extending further into the sidewalls provide additional sidewall protection where the risk of damage is highest;
- Computer-simulated tread pattern designed to provide flotation in the harshest conditions, including gravel, mud, rocks and snow.
- The use of a new rubber compound makes it possible to increase the tread wear resistance by 15% on asphalt and by 100% on gravel, as well as uniform wear over a long period of time;
- Tires are marked 3PMSF (3 Peak Montain SnowFlake - Snowflake on the background of three peaks). This abbreviation confirms the possibility of confident driving even in the most extreme winter conditions.
Inch size 35x12.5R17
Metric size 315/70R17
Load/speed index 121S (max speed: 180 km/h or 113 mph. Max load 1450 kg.)
Disc diameter 17.0"
Line structure5 Radial 90 Tread Non-directional
Tread type Universal (AT)
Studding None
Tread Depth(x) 12mm,
Contact Patch Width (inches) (Normal Pressure) n/a
Actual Height 34.4"
Actual Width 12.70"
Recommended Wheel Size 8" - 11"
Max Pressure 4.30 atm.
Maximum load 1438 kg.
Weight 29.21 kg.
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