245/40R17 vs 195/70R14
195/70R14 is 0.1% taller (+0.03 in) and 1.97 in narrower than 245/40R17.
195/70R14 is 0.1% taller than 245/40R17. That is inside the ±3% most shops treat as a straight swap.
Real speed on 195/70R14.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 195/70R14 tires
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245/40R17 or 195/70R14?
Can I use 195/70R14 instead of 245/40R17?
195/70R14 is 0.1% taller than 245/40R17. 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 195/70R14 you are really doing 60.1 mph if the speedometer was set up for 245/40R17. Going the other way, 245/40R17 would make it read 59.9 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.02 in (+0 mm) under the axle.