tireheight.com255/70R18 vs 275/65R18
255/70R18 and 275/65R18 are about the same height: 32.1″ and 32.1″ on average as listed by their makers (32.06″ and 32.07″ on paper).
What changes
Going from 255/70R18 to 275/65R18.
Lift is half the height difference, since the axle sits at the middle of the tire. The speedometer figure assumes it was set for 255/70R18 and uses the revolutions per mile the makers publish: at an indicated 60 mph you'd be doing 60.1 mph.
Side by side
| 255/70R18 | 275/65R18 | Difference | |
|---|---|---|---|
| Listed height ″ | 32.09–32.30 | 32.09–32.44 | +0.03 |
| Size code height ″ | 32.06 | 32.07 | +0.02 |
| Height under load ″ | 31.1 | 31.2 | +0.0 |
| Width ″ | 10.04 | 10.83 | +0.79 |
| Listed width ″ | 10.2–10.5 | 10.7–11.0 | +0.7 |
| Sidewall ″ | 7.03 | 7.04 | +0.01 |
| Wheel ″ | 18 | 18 | same |
| Weight lb | 35.3–52.3 | 37.7–63.0 | +7.5 |
| Tread depth /32″ | 9–15 | 10–19 | +1.9 |
| Tires listed | 14 | 46 |
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 | 255/70R18 ″ | 275/65R18 ″ | Taller by | Heavier by |
|---|---|---|---|---|
| BFGoodrich Advantage Control HT | 32.09 | 32.09 | +0.00″ | +3.2 lb |
| BFGoodrich All-Terrain T/A KO3 | 32.10 | 32.10 | +0.00″ | +4.5 lb |
| BFGoodrich Trail-Terrain T/A | 32.10 | 32.10 | +0.00″ | +2.2 lb |
| BFGoodrich Trail-Terrain T/A+ | 32.10 | 32.10 | +0.00″ | +1.8 lb |
| General Grabber A/TX | 32.10 | 32.10 | +0.00″ | +6.0 lb |
| General Grabber APT | 32.10 | 32.10 | +0.00″ | +8.4 lb |
| General Grabber H/T | 32.10 | 32.10 | +0.00″ | +8.0 lb |
| Michelin Defender LTX M/S 2 | 32.10 | 32.10 | +0.00″ | +7.3 lb |
| Michelin X-Ice Snow | 32.09 | 32.09 | +0.00″ | +2.3 lb |
| Toyo Open Country A/T III | 32.09 | 32.18 | +0.09″ | +10.0 lb |
| Toyo Open Country H/T II | 32.09 | 32.09 | +0.00″ | +6.3 lb |
Questions about 255/70R18 vs 275/65R18
How much taller is 275/65R18 than 255/70R18?
0.03″ on average, going by the heights tire makers list: 255/70R18 tires are listed at 32.09–32.30″ and 275/65R18 at 32.09–32.44″. The size codes work out to 32.06″ and 32.07″, a 0.02″ difference.
How much lift does 275/65R18 give over 255/70R18?
Almost none: the tire's radius changes by 0.02″. 275/65R18 is also 0.79″ wider on paper, 0.39″ per side on the same wheel. Whether it fits depends on your vehicle, lift and wheel offset.
Will my speedometer be off with 275/65R18 instead of 255/70R18?
Barely: about 0.2% slow.
Can 275/65R18 go on the same wheel as 255/70R18?
Both fit a 18-inch wheel. Wheel widths approved for both run from 7.5″ to 8.5″.