295/70R18 vs 315/70R17
315/70R17 is 0.3% taller (+0.10 in) and 0.79 in wider than 295/70R18.
315/70R17 is 0.3% taller than 295/70R18. That is inside the ±3% most shops treat as a straight swap.
Real speed on 315/70R17.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 315/70R17 tires
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295/70R18 or 315/70R17?
Can I use 315/70R17 instead of 295/70R18?
315/70R17 is 0.3% taller than 295/70R18. 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 315/70R17 you are really doing 60.2 mph if the speedometer was set up for 295/70R18. Going the other way, 295/70R18 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.