175/70R13 vs 155/80R13
155/80R13 is 0.5% taller (+0.12 in) and 0.79 in narrower than 175/70R13.
155/80R13 is 0.5% taller than 175/70R13. That is inside the ±3% most shops treat as a straight swap.
Real speed on 155/80R13.
Change in height under the axle.
On the same wheel, split inboard and outboard.
Shop 155/80R13 tires
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175/70R13 or 155/80R13?
Can I use 155/80R13 instead of 175/70R13?
155/80R13 is 0.5% taller than 175/70R13. 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 155/80R13 you are really doing 60.3 mph if the speedometer was set up for 175/70R13. Going the other way, 175/70R13 would make it read 59.7 mph at a real 60.
How much ground clearance does it change?
Half the diameter difference: +0.06 in (+2 mm) under the axle.