355/61R21 Tire Size Specifications
This tire size 355/61R21 fits 0 vehicles in our database.
Everything to know about the 355/61R21 tire size
Size geometry
A 355/61R21 tire has a 355mm section width and a 61% aspect ratio, mounted on a 21-inch rim. Sidewall height works out to 216.6mm (8.53") and overall outside diameter is 966.5mm (38.05"). At highway speed the tire completes about 329 revolutions per kilometre â your speedometer and odometer were calibrated against this number.
Direct substitute sizes
If 355/61R21 is unavailable, the closest same-diameter substitutes on the same rim are 345/63R21 and 365/59R21. 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 355/61R21 you can upsize to 365/56R22 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 345/66R20 (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 355/61R21 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 355/61R21
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