185/55R15 vs 175/65R15
175/65R15 is 4.1% taller (+0.94 in) and 0.39 in narrower than 185/55R15.
175/65R15 is 4.1% taller than 185/55R15. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 175/65R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 175/65R15 tires
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185/55R15 or 175/65R15?
Can I use 175/65R15 instead of 185/55R15?
175/65R15 is 4.1% taller than 185/55R15. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock. 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 175/65R15 you are really doing 62.5 mph if the speedometer was set up for 185/55R15. Going the other way, 185/55R15 would make it read 57.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.47 in (+12 mm) under the axle.