Home / Compare / 225/65R17 vs 235/65R17
225/65R17 vs 235/65R17 Tires: Size Difference
The 235/65R17 is 0.5 inches taller than the 225/65R17 (29.0 in against 28.5 in, +1.8%). At a displayed 60 mph on the speedometer you are really doing 61.1 mph. Edit either size below to compare something else.
1.8% taller overall: inside the common 3% guideline. Speedometer and odometer will be off by about the same percentage.
| Measure | Current 225/65R17 | New 235/65R17 | Difference |
|---|---|---|---|
| Overall diameter | 28.5 in (724 mm) | 29.0 in (737 mm) | +0.5 in (+1.8%) |
| Section width | 8.9 in (225 mm) | 9.3 in (235 mm) | +0.4 in (+10 mm) |
| Sidewall height | 5.8 in (146 mm) | 6.0 in (153 mm) | +0.3 in (+7 mm) |
| Circumference | 89.6 in | 91.2 in | +1.6 in (+1.8%) |
| Revolutions per mile | 707 | 695 | -12 (-1.8%) |
| Rim diameter | 17 in | 17 in | 0 in |
Ground clearance changes by about +0.3 in (+7 mm) at the axle, before load and tire flex.
| Speedometer shows (mph) | 30 | 45 | 60 | 70 | 80 |
|---|---|---|---|---|---|
| Actual speed (mph) | 30.5 | 45.8 | 61.1 | 71.3 | 81.4 |
| Speedometer shows (km/h) | 50 | 80 | 100 | 120 |
|---|---|---|---|---|
| Actual speed (km/h) | 50.9 | 81.4 | 101.8 | 122.2 |
Assumes the speedometer is accurate on the current size and reads from wheel rotation. Real speedometers can read a little high or low.
Estimates from the size codes only. This does not check whether the new size fits, rubs or is safe on your vehicle; ask a tire shop before you buy.
What changes between 225/65R17 and 235/65R17
- Diameter: 28.5 in becomes 29.0 in (+0.5 in, +1.8%). 1.8% taller overall: inside the common 3% guideline. Speedometer and odometer will be off by about the same percentage.
- Width: 225 mm (8.9 in) becomes 235 mm (9.3 in), a change of +10 mm.
- Sidewall: 146 mm (5.8 in) becomes 153 mm (6.0 in). A taller sidewall rides softer; a shorter one steers sharper.
- Revolutions per mile: 707 becomes 695, so the wheel turns 12 fewer times for every mile.
- Rim: 17 in and 17 in (the same wheel size).
Speedometer and odometer
With the 235/65R17 fitted and a speedometer set up for the 225/65R17, the dial no longer matches the road. The actual speed is the displayed speed multiplied by 29.0 / 28.5 = 1.018. The speedometer will read low by about 1.8% and the odometer will under-count distance by the same amount. Over 10,000 displayed miles you would really cover 10179 miles.
These figures assume the speedometer was accurate on the 225/65R17. A recalibration by a dealer or tuner can bring the dial back in line if the gap bothers you.
Will 235/65R17 fit instead of 225/65R17?
This page works out numbers from the size codes; it does not know your vehicle. Before you buy, check:
- The tire placard on the driver's door jamb for the approved sizes and the minimum load index and speed rating.
- Whether your wheel width suits a 235 mm tire. Every tire has an approved rim-width range.
- Clearance at full steering lock and over bumps, including the fender liner and suspension parts.
- If you change rim size, that brake calipers clear the new wheel.
The guide to reading a tire size explains every part of the code, and the pages for 225/65R17 and 235/65R17 give each size on its own.
More tire size comparisons
225/65R17 vs 235/65R17 FAQ
Is 235/65R17 bigger than 225/65R17?
Yes. The 235/65R17 is 29.0 inches tall against 28.5 inches for the 225/65R17, a difference of +0.5 inches (+1.8%). It is 10 mm wider than the 225/65R17.
How much will my speedometer be off going from 225/65R17 to 235/65R17?
If the speedometer is accurate on the 225/65R17, then at a displayed 60 mph you are doing 61.1 mph on the 235/65R17, and at a displayed 100 km/h you are doing 101.8 km/h. The odometer will differ by the same 1.8%.
Is the difference between 225/65R17 and 235/65R17 within the 3% rule?
Yes. The overall diameter differs by 1.8%, and the common guideline is about 3%. Staying within it keeps the speedometer error small but does not guarantee the tire will fit.
Will 235/65R17 rub where 225/65R17 does not?
That depends on your vehicle. The 235/65R17 is 10 mm wider and its sidewall is 7 mm taller. Wheel offset, wheel width, suspension and fender liners decide whether it rubs, so ask a tire shop.