Section Width105 mm (4.1")
Aspect Ratio387%
Rim Diameter42"
Overall Diameter1880 mm (74.0")
Sidewall Height406 mm
Circumference5905 mm
105/387R42 — Buy Tires

Everything to know about the 105/387R42 tire size

Size geometry

A 105/387R42 tire has a 105mm section width and a 387% aspect ratio, mounted on a 42-inch rim. Sidewall height works out to 406.4mm (16.00") and overall outside diameter is 1879.5mm (74.00"). At highway speed the tire completes about 169 revolutions per kilometre — your speedometer and odometer were calibrated against this number.

Direct substitute sizes

If 105/387R42 is unavailable, the closest same-diameter substitutes on the same rim are 95/428R42 and 115/353R42. 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 105/387R42 you can upsize to 115/342R43 (plus-one) to fit a larger wheel without changing the speedometer reading, or downsize to 95/441R41 (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 105/387R42 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 105/387R42

tire_size.no_vehicles_found