Can Trailer Tire Size 20.5x8-10 be Upgraded to 13 inch Tire Size

Updated 07/16/2025 | Published 12/18/2024

Products Featured in This Question

Kenda Karrier ST175/80R13 Radial Trailer Tire with 13" Black Mod Wheel - 5 on 4-1/2 - LR D

(2797)

$141.60

Loadstar ST175/80D13 Bias Trailer Tire with 13" Galvanized Wheel - 4 on 4 - Load Range C

(7282)

$114.86

Question:

I have 20.5x8-10 on my 4 place snowmobile floe trailer. What size can I safety go to 13 wheel

asked by: Paul D

Expert Reply:

Hey Paul, so your current tire size is 20.5 inch in diameter and the smallest diameter 13 inch trailer tire diameter is 175/80-13 which is 24.1 inches. So that is a difference of 3.6 inches and since that gets split on either side of your wheel diameter you'd lose fender clearance by 1.8 inches. Most likely that's not a big deal but you'd want to measure to be sure.

The part # AM31990 would work great if the bolt pattern is 5 on 4-1/2 inch or part # AM3S130 if you have a 4 lug bolt pattern.

expert reply by: Jameson C

Greg M.

7/16/2025

I'm thinking of doing the same thing but I'm running into a problem with the pilot hole size on a 20.5x8-10 rim and tire 5 lug have 2.83 pilot hole vs 175/80-13 has a 3.19 pilot hole? Thanks

Jameson C.

7/16/2025

@GregM Having a slightly larger pilot diameter actually won't be a problem since the wheel actually centers on the lug nuts and not the center hole.