Tire Revolutions per Mile Chart

Revolutions per mile = 63,360 ÷ (π × diameter in inches). The calculated figure uses the unloaded diameter; makers publish a figure measured under load, which in the data books we use is about 2.5–5% higher. For speedometer or gearing work, use the maker's figure for your exact tire.

Size	Calculated revs/mi	Published revs/mi	Diameter
37x12.50R17	545	565–577	37.0 in
37x12.50R20	545	565–572	37.0 in
37x13.50R20	545	560–573	37.0 in
37x12.50R18	545	565–575	37.0 in
37x12.50R22	545	565–569	37.0 in
295/65R20	575	588–596	35.1 in
35x12.50R20	576	592–606	35.0 in
35x12.50R17	576	596–609	35.0 in
35x12.50R18	576	593–607	35.0 in
35x12.50R22	576	593–602	35.0 in
35x11.50R20	576	598–604	35.0 in
35x11.50R17	576	602–609	35.0 in
35x12.50R24	576	—	35.0 in
35x12.50R15	576	598–608	35.0 in
285/75R18	579	593–601	34.8 in
315/75R16	583	601–606	34.6 in
315/70R17	587	600–608	34.4 in
285/55R22	587	600–604	34.3 in
295/70R18	589	602–609	34.3 in
275/65R20	592	605–615	34.1 in
295/60R20	594	608–617	33.9 in
285/75R17	596	609–618	33.8 in
285/70R18	598	614	33.7 in
285/60R20	603	617–625	33.5 in
305/55R20	607	621–637	33.2 in
275/70R18	608	619–631	33.2 in
255/80R17	610	624–633	33.1 in
33x12.50R20	611	630–643	33.0 in
33x12.50R18	611	630–643	33.0 in
33x12.50R17	611	634–643	33.0 in
33x12.50R22	611	629–639	33.0 in
33x12.50R15	611	628–650	33.0 in
33x10.50R15	611	632	33.0 in
275/60R20	611	626–642	33.0 in
285/75R16	614	626–638	32.8 in
275/50R22	614	632–638	32.8 in
305/45R22	615	633–635	32.8 in
285/70R17	617	627–647	32.7 in
265/70R18	619	624–646	32.6 in
285/65R18	619	633–643	32.6 in
265/60R20	620	634–650	32.5 in
285/55R20	624	637–654	32.3 in
275/70R17	627	645–652	32.2 in
285/45R22	628	643–651	32.1 in
275/65R18	629	640–660	32.1 in
255/75R17	629	643–654	32.1 in
255/70R18	629	647–658	32.1 in
32x11.50R15	630	657–664	32.0 in
275/55R20	632	647–662	31.9 in
235/85R16	636	648–661	31.7 in
265/75R16	637	649–661	31.6 in
265/70R17	638	648–672	31.6 in
305/40R22	638	657–659	31.6 in
265/65R18	639	658–665	31.6 in
245/75R17	641	651–665	31.5 in
255/70R17	649	667–679	31.1 in
255/65R18	650	669–680	31.1 in
255/55R20	650	670–680	31.0 in
31x10.50R15	651	667–687	31.0 in
275/45R21	656	676–680	30.7 in
265/70R16	659	677–692	30.6 in
265/65R17	660	675–684	30.6 in
265/60R18	661	680–696	30.5 in
245/70R17	661	675–691	30.5 in
245/75R16	662	674–694	30.5 in
295/45R20	662	681–685	30.5 in
265/50R20	663	677–690	30.4 in
235/55R20	668	689–697	30.2 in
255/65R17	671	689–700	30.1 in
255/60R18	671	690–705	30.0 in
255/55R19	671	692–704	30.0 in
255/50R20	671	688–699	30.0 in
235/65R18	672	691–705	30.0 in
30x9.50R15	672	698–713	30.0 in
275/45R20	678	692–705	29.7 in
245/50R20	680	697–708	29.6 in
245/55R19	681	697–711	29.6 in
245/60R18	682	703–716	29.6 in
245/65R17	683	700–719	29.5 in
245/70R16	684	702–717	29.5 in
265/35R22	688	703–713	29.3 in
225/75R16	689	705–721	29.3 in
235/55R19	691	710–723	29.2 in
235/60R18	693	709–726	29.1 in
255/55R18	694	716–730	29.0 in
255/50R19	695	713–723	29.0 in
255/45R20	695	710–720	29.0 in
235/65R17	695	709–720	29.0 in
235/70R16	697	716–729	29.0 in
235/75R15	698	714–734	28.9 in
245/45R20	703	720–730	28.7 in
315/35R20	703	722–731	28.7 in
275/40R20	704	717–730	28.7 in
225/60R18	704	726–738	28.6 in
225/65R17	707	729–744	28.5 in
305/35R20	710	729–739	28.4 in
225/75R15	713	734–747	28.3 in
235/50R19	714	734–742	28.3 in
235/55R18	716	737–750	28.2 in
255/45R19	719	739–746	28.0 in
255/40R20	719	736–747	28.0 in
275/60R15	720	745	28.0 in
215/70R16	724	744–757	27.9 in
225/55R18	727	747–763	27.7 in
245/40R20	728	744–758	27.7 in
215/75R15	728	751–765	27.7 in
245/45R19	729	747–759	27.7 in
225/60R17	730	750–764	27.6 in
275/35R20	731	749–760	27.6 in
225/70R15	736	757–762	27.4 in
235/50R18	740	757–771	27.3 in
305/30R20	741	758–767	27.2 in
235/55R17	742	759–778	27.2 in
215/60R17	743	765–777	27.2 in
205/75R15	744	766–769	27.1 in
255/60R15	746	771	27.0 in
255/40R19	746	763–782	27.0 in
255/35R20	746	760–785	27.0 in
215/65R16	747	769–786	27.0 in
225/50R18	751	771–782	26.9 in
215/70R15	751	773–776	26.9 in
245/35R20	754	771–782	26.8 in
225/55R17	754	773–788	26.7 in
245/40R19	755	771–784	26.7 in
245/45R18	756	776–786	26.7 in
225/60R16	757	781–795	26.6 in
295/50R15	758	784	26.6 in
275/35R19	759	779–789	26.6 in
235/40R19	764	785–795	26.4 in
235/45R18	766	785–795	26.3 in
215/55R17	767	789–800	26.3 in
205/70R15	767	786–795	26.3 in
215/60R16	771	793–805	26.2 in
205/75R14	773	795–799	26.1 in
235/60R15	773	800	26.1 in
225/40R19	773	788–804	26.1 in
255/40R18	775	794–805	26.0 in
255/35R19	775	793–805	26.0 in
225/45R18	777	794–808	26.0 in
225/50R17	780	801–820	25.9 in
245/35R19	783	799–813	25.8 in
225/55R16	783	807–821	25.7 in
245/40R18	784	800–815	25.7 in
205/60R16	785	804–824	25.7 in
245/45R17	785	799–815	25.7 in
275/40R17	786	805–813	25.7 in
215/45R18	787	803–817	25.6 in
205/65R15	791	816–832	25.5 in
235/35R19	792	806–823	25.5 in
215/50R17	792	814–824	25.5 in
235/40R18	794	806–826	25.4 in
235/45R17	796	815–827	25.3 in
215/55R16	797	822–834	25.3 in
265/35R18	797	817–827	25.3 in
225/40R18	804	818–837	25.1 in
205/50R17	804	827–837	25.1 in
195/65R15	807	831–848	25.0 in
225/45R17	808	822–840	25.0 in
205/55R16	811	834–845	24.9 in
215/45R17	819	837–851	24.6 in
185/65R15	824	850–865	24.5 in
195/55R16	825	848–862	24.4 in
195/60R15	833	858–868	24.2 in
185/55R16	840	865–874	24.0 in
185/60R15	850	875–884	23.7 in
195/50R16	852	876–883	23.7 in
185/65R14	859	885–898	23.5 in
195/55R15	860	883–898	23.4 in
205/45R16	867	894–895	23.3 in
205/50R15	874	899–910	23.1 in
185/55R15	876	902–915	23.0 in
195/50R15	889	910–921	22.7 in

Important: These are calculated (nominal) dimensions, not a fitment recommendation. Real tires of the same size differ by brand and model (makers allow about ±3% of section height), and width changes with the rim it is mounted on. The math can't see wheel width and offset, clearance at full steering lock and suspension travel, load index, speed rating, or what your vehicle maker approves. Before changing size, check your door-jamb placard and owner's manual and ask a tire professional. A replacement tire must meet or exceed the load index and speed rating on the placard.