Recommended ST145/R12 Radial Tire on a 12" x 4" Rim for a Spare Tire

Updated 07/20/2026 | Published 07/15/2026

Products Featured in This Question

Taskmaster Steel Modular Trailer Wheel - 12" x 4" Rim - 5 on 4-1/2 - Silver

(589)

$45.50

Rambler ST145/R12 Radial Trailer Tire - Load Range D

(85)

$73.32

Question:

I am looking for a spare tire on a rim for my jetski trailer i can email you pictures of the tags on the trailer if u can help me find a spare I need to purchase one

asked by: curtis f

Expert Reply:

Thanks for the pics Curtis. I looked at our options and the closest I could find to your wheels is the Taskmaster Steel Modular Trailer Wheel item # TA79RR. This is a 12" x 4" rim with a 5 on 4-1/2 lug nut pattern.

For a tire, you would need the Rambler ST145/R12 Radial Trailer Tire item # TA89GR. We do not have this combo mounted. This is a load range D tire with a 1,230 lbs capacity and a top highway speed of 81 mph.

expert reply by: Jerred H

Jerred H.

7/20/2026

Thanks for the pictures Curtis. I looked at our options and the closest I could find to your wheels is the Taskmaster Steel Modular Trailer Wheel item # TA79RR. For a tire, you would need the Rambler ST145/R12 Radial Trailer Tire item # TA89GR. We do not have this combo mounted.