185/65R15 vs 245/40R17
245/40R17 is 1.0% taller (+0.25 in) and 2.36 in wider than 185/65R15.
245/40R17 is 1.0% taller than 185/65R15. That is inside the ±3% most shops treat as a straight swap.
Real speed on 245/40R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 245/40R17 tires
Opens the store’s own searchPrices and stock change often, so check a few stores. We don’t earn anything from these links.
185/65R15 or 245/40R17?
Can I use 245/40R17 instead of 185/65R15?
245/40R17 is 1.0% taller than 185/65R15. 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 245/40R17 you are really doing 60.6 mph if the speedometer was set up for 185/65R15. Going the other way, 185/65R15 would make it read 59.4 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.12 in (+3 mm) under the axle.