265/40R22 vs 305/40R22
305/40R22 is 4.2% taller (+1.26 in) and 1.57 in wider than 265/40R22.
305/40R22 is 4.2% taller than 265/40R22. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 305/40R22.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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265/40R22 or 305/40R22?
Can I use 305/40R22 instead of 265/40R22?
305/40R22 is 4.2% taller than 265/40R22. 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 305/40R22 you are really doing 62.5 mph if the speedometer was set up for 265/40R22. Going the other way, 265/40R22 would make it read 57.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.63 in (+16 mm) under the axle.