225/45R17 vs 195/65R15
195/65R15 is 0.0% taller (+0.01 in) and 1.18 in narrower than 225/45R17.
195/65R15 and 225/45R17 are the same overall diameter, so the speedometer stays accurate.
Real speed on 195/65R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 195/65R15 tires
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225/45R17 or 195/65R15?
Can I use 195/65R15 instead of 225/45R17?
195/65R15 and 225/45R17 are the same overall diameter, so the speedometer stays accurate. 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 195/65R15 you are really doing 60.0 mph if the speedometer was set up for 225/45R17. Going the other way, 225/45R17 would make it read 60.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.00 in (+0 mm) under the axle.