tireheight.com235/80R17 vs 285/70R17
285/70R17 is 1.0″ taller than 235/80R17 on average, going by the heights their makers list (31.8″ vs 32.9″). On paper the gap is 0.91″.
What changes
Going from 235/80R17 to 285/70R17.
Lift is half the height difference, since the axle sits at the middle of the tire. The speedometer figure assumes it was set for 235/80R17 and uses the revolutions per mile the makers publish: at an indicated 60 mph you'd be doing 61.8 mph.
Side by side
| 235/80R17 | 285/70R17 | Difference | |
|---|---|---|---|
| Listed height ″ | 31.80–32.05 | 32.70–33.15 | +1.01 |
| Size code height ″ | 31.80 | 32.71 | +0.91 |
| Height under load ″ | 30.9 | 31.8 | +0.9 |
| Width ″ | 9.25 | 11.22 | +1.97 |
| Listed width ″ | 9.2–9.4 | 11.4–11.6 | +2.2 |
| Sidewall ″ | 7.40 | 7.85 | +0.45 |
| Wheel ″ | 17 | 17 | same |
| Weight lb | 42.4–52.9 | 46.0–65.7 | +10.5 |
| Tread depth /32″ | 12–19 | 13–19 | +1.4 |
| Tires listed | 17 | 36 |
Tires sold in both sizes
The same model in each size, by the heights the maker lists. Averages where a model comes in several load ranges.
| Tire | 235/80R17 ″ | 285/70R17 ″ | Taller by | Heavier by |
|---|---|---|---|---|
| BFGoodrich All-Terrain T/A KO3 | 31.80 | 32.80 | +1.00″ | +6.9 lb |
| BFGoodrich HD-Terrain T/A KT | 31.80 | 32.80 | +1.00″ | +11.1 lb |
| General Grabber A/TX | 31.80 | 32.70 | +0.90″ | +10.1 lb |
| General Grabber APT | 31.80 | 32.70 | +0.90″ | +11.6 lb |
| Toyo M-55 | 32.01 | 33.15 | +1.14″ | +9.3 lb |
| Toyo M655 | 32.01 | 33.07 | +1.06″ | +7.1 lb |
| Toyo Open Country A/T III | 31.81 | 32.81 | +1.00″ | +8.8 lb |
| Toyo Open Country C/T | 32.05 | 32.99 | +0.95″ | +8.9 lb |
| Toyo Open Country H/T II | 31.81 | 32.76 | +0.94″ | +8.0 lb |
| Toyo Open Country WLT1 | 31.93 | 32.84 | +0.91″ | +7.1 lb |
Questions about 235/80R17 vs 285/70R17
How much taller is 285/70R17 than 235/80R17?
1.01″ on average, going by the heights tire makers list: 235/80R17 tires are listed at 31.80–32.05″ and 285/70R17 at 32.70–33.15″. The size codes work out to 31.80″ and 32.71″, a 0.91″ difference.
How much lift does 285/70R17 give over 235/80R17?
The tire's radius grows by 0.50″, so the axle sits about 0.50″ higher, and the top of the tread comes 0.50″ closer to the fender. 285/70R17 is also 1.97″ wider on paper, 0.98″ per side on the same wheel. Whether it fits depends on your vehicle, lift and wheel offset.
Will my speedometer be off with 285/70R17 instead of 235/80R17?
Yes. If it's set for 235/80R17, it will read about 3.0% slow: at an indicated 60 mph you'll be doing 61.8 mph. Worked out from the revolutions per mile the makers publish.
Can 285/70R17 go on the same wheel as 235/80R17?
Both fit a 17-inch wheel. Wheel widths approved for both run from 7.5″ to 8.0″.