Tire Size Box

315/50R17 vs 315/60R17

315/60R17 compared with 315/50R17

+8.4% diameter, 0.0" width

315/60R17 is 31.88" tall vs 29.40". More than the 3% rule of thumb, so check carefully before switching.

29.4"17" rim6.2"12.4" wide
315/50R17 (solid) compared with 315/60R17 (dashed outline), drawn to scale

With 315/60R17 tires, when your speedometer says 60 mph you are really going

65.1 mph

315/60R17 is +2.48 inches (+8.4%) in overall diameter. That is more than the 3% most shops and makers recommend.

315/50R17315/60R17Difference%
Overall diameter29.40"31.88"+2.48"+8.4%
Section width12.40"12.40"0.00"0.0%
Sidewall height6.20"7.44"+1.24"+20.0%
Circumference92.37"100.16"+7.79"+8.4%
Revolutions per mile686.0632.6−53.4−7.8%

Speedometer difference

If your vehicle came with 315/50R17 and you fit 315/60R17, here is your real speed for each speedometer reading:

Speedometer showsActual speedDifference
20 mph21.7 mph+1.7 mph
30 mph32.5 mph+2.5 mph
40 mph43.4 mph+3.4 mph
50 mph54.2 mph+4.2 mph
60 mph65.1 mph+5.1 mph
65 mph70.5 mph+5.5 mph
70 mph75.9 mph+5.9 mph
75 mph81.3 mph+6.3 mph
80 mph86.7 mph+6.7 mph

Each size on its own

Questions

Which is bigger, 315/50R17 or 315/60R17?
315/60R17 is taller by 2.48 inches (31.88" vs 29.40"). 315/50R17 is the same width.
Can I replace 315/50R17 with 315/60R17?
It is not recommended without checking carefully. The diameter difference is +8.4%, more than the 3% most shops and makers allow. It will throw off the speedometer and may affect ABS, stability control and clearance.
How much will 315/60R17 change my speedometer?
When your speedometer reads 60 mph with 315/60R17 fitted (calibrated for 315/50R17), your real speed is 65.1 mph. Your odometer will under-count miles by about 8.4%.
Will 315/60R17 lift my vehicle?
Ride height changes by half the diameter difference: +1.24 inches of ground clearance at the axle.

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