155/70R13 vs 185/70R13
185/70R13 is 7.7% taller (+1.65 in) and 1.18 in wider than 155/70R13.
185/70R13 is 7.7% taller than 155/70R13. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears.
Real speed on 185/70R13.
Change in height under the axle.
On the same wheel, split inboard and outboard.
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155/70R13 or 185/70R13?
Can I use 185/70R13 instead of 155/70R13?
185/70R13 is 7.7% taller than 155/70R13. Beyond 5% you usually need a lift or leveling kit, a speedometer recalibration and sometimes new gears. 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 185/70R13 you are really doing 64.6 mph if the speedometer was set up for 155/70R13. Going the other way, 155/70R13 would make it read 55.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.83 in (+21 mm) under the axle.