185/60R15 vs 185/65R15
185/65R15 is 3.1% taller (+0.73 in) and the same width than 185/60R15.
185/65R15 is 3.1% taller than 185/60R15. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 185/65R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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185/60R15 or 185/65R15?
Can I use 185/65R15 instead of 185/60R15?
185/65R15 is 3.1% taller than 185/60R15. 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 185/65R15 you are really doing 61.8 mph if the speedometer was set up for 185/60R15. Going the other way, 185/60R15 would make it read 58.2 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.36 in (+9 mm) under the axle.