SidewallerTire & wheel calculators

175/65R15 vs 185/70R14

185/70R14 is 1.0% taller (+0.24 in) and 0.39 in wider than 175/65R15.

OK
Close match

185/70R14 is 1.0% taller than 175/65R15. That is inside the ±3% most shops treat as a straight swap.

175/65R15185/70R14Change
Diameter23.96″24.20″+0.24″+1.0%
Width6.89″7.28″+0.39″+5.7%
Sidewall4.48″5.10″+0.62″+13.8%
Circumference75.3″76.0″+0.8″+1.0%
Wheel15″14″−1″
Revs per mile842834−8
SideTread
175/65R15185/70R14
Speedometer shows 60 mph60.6mph

Real speed on 185/70R14.

Ground clearance+0.12in

Change in height under the axle.

Width per side+0.20in

On the same wheel, split inboard and outboard.

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175/65R15 or 185/70R14?

Can I use 185/70R14 instead of 175/65R15?

185/70R14 is 1.0% taller than 175/65R15. That is inside the ±3% most shops treat as a straight swap. Also match or beat the original load index and speed rating, and check that the wheel width suits the new tire.

Will my speedometer be off?

At an indicated 60 mph on 185/70R14 you are really doing 60.6 mph if the speedometer was set up for 175/65R15. Going the other way, 175/65R15 would make it read 59.4 mph at a real 60.

How much ground clearance does it change?

Half the diameter difference: +0.12 in (+3 mm) under the axle.

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