645/20R29 Tire Size Specifications
This tire size 645/20R29 fits 0 vehicles in our database.
Everything to know about the 645/20R29 tire size
Size geometry
A 645/20R29 tire has a 645mm section width and a 20% aspect ratio, mounted on a 29-inch rim. Sidewall height works out to 129.0mm (5.08") and overall outside diameter is 994.6mm (39.16"). At highway speed the tire completes about 320 revolutions per kilometre â your speedometer and odometer were calibrated against this number.
Direct substitute sizes
If 645/20R29 is unavailable, the closest same-diameter substitutes on the same rim are 635/20R29 and 655/20R29. Both keep your speedometer reading within 1% â safe for daily use, ABS, and stability control. Always verify load and speed ratings before swapping.
Plus / minus sizing options
For a 645/20R29 you can upsize to 655/18R30 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 635/22R28 (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 645/20R29 tire size from the factory. Aftermarket fitment depends on rim width, offset, and clearance â match these specs to your wheel before purchasing tires.
Vehicles Using 645/20R29
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