165/70R14 vs 185/65R14
185/65R14 is 1.6% taller (+0.37 in) and 0.79 in wider than 165/70R14.
185/65R14 is 1.6% taller than 165/70R14. That is inside the ±3% most shops treat as a straight swap.
Real speed on 185/65R14.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 185/65R14 tires
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165/70R14 or 185/65R14?
Can I use 185/65R14 instead of 165/70R14?
185/65R14 is 1.6% taller than 165/70R14. 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 185/65R14 you are really doing 61.0 mph if the speedometer was set up for 165/70R14. Going the other way, 165/70R14 would make it read 59.0 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.19 in (+5 mm) under the axle.