185/60R15 vs 185/55R16
185/55R16 is 1.1% taller (+0.27 in) and the same width than 185/60R15.
185/55R16 is 1.1% taller than 185/60R15. That is inside the ±3% most shops treat as a straight swap.
Real speed on 185/55R16.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 185/55R16 tires
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185/60R15 or 185/55R16?
Can I use 185/55R16 instead of 185/60R15?
185/55R16 is 1.1% taller than 185/60R15. 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 185/55R16 you are really doing 60.7 mph if the speedometer was set up for 185/60R15. Going the other way, 185/60R15 would make it read 59.3 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.14 in (+3 mm) under the axle.