195/55R15 vs 175/65R15
175/65R15 is 2.2% taller (+0.51 in) and 0.79 in narrower than 195/55R15.
175/65R15 is 2.2% taller than 195/55R15. That is inside the ±3% most shops treat as a straight swap.
Real speed on 175/65R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 175/65R15 tires
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195/55R15 or 175/65R15?
Can I use 175/65R15 instead of 195/55R15?
175/65R15 is 2.2% taller than 195/55R15. 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 175/65R15 you are really doing 61.3 mph if the speedometer was set up for 195/55R15. Going the other way, 195/55R15 would make it read 58.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.26 in (+7 mm) under the axle.