175/65R14 vs 165/70R14
165/70R14 is 0.6% taller (+0.14 in) and 0.39 in narrower than 175/65R14.
165/70R14 is 0.6% taller than 175/65R14. That is inside the ±3% most shops treat as a straight swap.
Real speed on 165/70R14.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 165/70R14 tires
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175/65R14 or 165/70R14?
Can I use 165/70R14 instead of 175/65R14?
165/70R14 is 0.6% taller than 175/65R14. 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 165/70R14 you are really doing 60.4 mph if the speedometer was set up for 175/65R14. Going the other way, 175/65R14 would make it read 59.6 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.07 in (+2 mm) under the axle.