185/65R15 vs 205/65R15
205/65R15 is 4.2% taller (+1.02 in) and 0.79 in wider than 185/65R15.
205/65R15 is 4.2% taller than 185/65R15. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 205/65R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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185/65R15 or 205/65R15?
Can I use 205/65R15 instead of 185/65R15?
205/65R15 is 4.2% taller than 185/65R15. 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 205/65R15 you are really doing 62.5 mph if the speedometer was set up for 185/65R15. Going the other way, 185/65R15 would make it read 57.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.51 in (+13 mm) under the axle.