245/35R20 vs 215/70R15
215/70R15 is 0.4% taller (+0.10 in) and 1.18 in narrower than 245/35R20.
215/70R15 is 0.4% taller than 245/35R20. That is inside the ±3% most shops treat as a straight swap.
Real speed on 215/70R15.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 215/70R15 tires
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245/35R20 or 215/70R15?
Can I use 215/70R15 instead of 245/35R20?
215/70R15 is 0.4% taller than 245/35R20. 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 215/70R15 you are really doing 60.2 mph if the speedometer was set up for 245/35R20. Going the other way, 245/35R20 would make it read 59.8 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.05 in (+1 mm) under the axle.