tireheight.com285/65R18 vs 285/70R17
285/65R18 and 285/70R17 are about the same height: 32.7″ and 32.9″ on average as listed by their makers (32.59″ and 32.71″ on paper).
What changes
Going from 285/65R18 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 285/65R18 and uses the revolutions per mile the makers publish: at an indicated 60 mph you'd be doing 60.4 mph.
Side by side
| 285/65R18 | 285/70R17 | Difference | |
|---|---|---|---|
| Listed height ″ | 32.56–33.40 | 32.70–33.15 | +0.12 |
| Size code height ″ | 32.59 | 32.71 | +0.12 |
| Height under load ″ | 31.6 | 31.8 | +0.2 |
| Width ″ | 11.22 | 11.22 | +0.00 |
| Listed width ″ | 10.9–11.5 | 11.4–11.6 | +0.1 |
| Sidewall ″ | 7.29 | 7.85 | +0.56 |
| Wheel ″ | 18 | 17 | −1 |
| Weight lb | 41.1–66.8 | 46.0–65.7 | −2.1 |
| Tread depth /32″ | 13–19 | 13–19 | −0.1 |
| Tires listed | 15 | 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 | 285/65R18 ″ | 285/70R17 ″ | Taller by | Heavier by |
|---|---|---|---|---|
| BFGoodrich All-Terrain T/A KO3 | 32.60 | 32.80 | +0.20″ | −3.1 lb |
| BFGoodrich HD-Terrain T/A KT | 32.60 | 32.80 | +0.20″ | −1.9 lb |
| BFGoodrich Mud-Terrain T/A KM3 | 32.60 | 32.80 | +0.20″ | −0.1 lb |
| General Grabber A/TX | 32.60 | 32.70 | +0.10″ | +1.0 lb |
| Michelin Defender LTX M/S 2 | 32.60 | 32.80 | +0.20″ | +4.3 lb |
| Mickey Thompson Baja Boss A/T | 33.20 | 32.90 | −0.30″ | −8.5 lb |
| Mickey Thompson Baja Boss M/T | 33.40 | 33.00 | −0.40″ | −1.0 lb |
| Mickey Thompson Baja Legend EXP | 33.00 | 33.10 | +0.10″ | −1.0 lb |
| Toyo Open Country A/T III | 32.56 | 32.81 | +0.26″ | −2.9 lb |
| Toyo Open Country M/T | 32.80 | 32.99 | +0.20″ | −2.6 lb |
| Toyo Open Country R/T | 32.80 | 32.99 | +0.20″ | +0.7 lb |
| Toyo Open Country R/T Pro | 32.60 | 32.76 | +0.16″ | −1.6 lb |
| Toyo Open Country R/T Trail | 32.56 | 32.76 | +0.20″ | −2.1 lb |
Questions about 285/65R18 vs 285/70R17
How much taller is 285/70R17 than 285/65R18?
0.12″ on average, going by the heights tire makers list: 285/65R18 tires are listed at 32.56–33.40″ and 285/70R17 at 32.70–33.15″. The size codes work out to 32.59″ and 32.71″, a 0.12″ difference.
How much lift does 285/70R17 give over 285/65R18?
Almost none: the tire's radius changes by 0.06″. Both are the same width on paper. Whether it fits depends on your vehicle, lift and wheel offset.
Will my speedometer be off with 285/70R17 instead of 285/65R18?
Yes. If it's set for 285/65R18, it will read about 0.7% slow: at an indicated 60 mph you'll be doing 60.4 mph. Worked out from the revolutions per mile the makers publish.
Can 285/70R17 go on the same wheel as 285/65R18?
No. 285/65R18 fits a 18-inch wheel and 285/70R17 a 17-inch wheel.