245/40R17 vs 245/45R17
245/45R17 is 3.9% taller (+0.96 in) and the same width than 245/40R17.
245/45R17 is 3.9% taller than 245/40R17. It often still fits, but expect a noticeable speedometer error and check clearance at full steering lock.
Real speed on 245/45R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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245/40R17 or 245/45R17?
Can I use 245/45R17 instead of 245/40R17?
245/45R17 is 3.9% taller than 245/40R17. 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 245/45R17 you are really doing 62.3 mph if the speedometer was set up for 245/40R17. Going the other way, 245/40R17 would make it read 57.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.48 in (+12 mm) under the axle.