Section Width635 mm (25.0")
Aspect Ratio10%
Rim Diameter27"
Overall Diameter813 mm (32.0")
Sidewall Height64 mm
Circumference2553 mm
635/10R27 — Buy Tires

Everything to know about the 635/10R27 tire size

Size geometry

A 635/10R27 tire has a 635mm section width and a 10% aspect ratio, mounted on a 27-inch rim. Sidewall height works out to 63.5mm (2.50") and overall outside diameter is 812.8mm (32.00"). At highway speed the tire completes about 392 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 635/10R27 is unavailable, the closest same-diameter substitutes on the same rim are 625/10R27 and 645/10R27. Both keep your speedometer reading within 1% — safe for daily use, ABS, and stability control. Always verify load and speed ratings before swapping.

Plus / minus sizing options

For a 635/10R27 you can upsize to 645/8R28 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 625/12R26 (minus-one) for a softer ride or winter setup. Both stay inside the Âą3% diameter tolerance that ABS and TPMS systems expect.

Vehicle compatibility

0 vehicles in our database run the 635/10R27 tire size from the factory. Aftermarket fitment depends on rim width, offset, and clearance — match these specs to your wheel before purchasing tires.

Vehicles Using 635/10R27

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