Can 5.30 x 12 Tires On A Pontoon Trailer Be Replaced With ST145/12 Tires

Question:

ST145/12R. Will this replace 5.30x12? I want to replace 4 tires on a pontoon trailer, but I want to use existing rims.

asked by: Todd E

Expert Reply:

Both an ST145/12R, like part # AM10130, and 5.30 x 12, like part # AM10068, will both fit a 12" wheel with the only difference being the overall diameter and section width. The # AM10130 has an overall diameter of 21.3" and section width of 5.7". The # AM10068 has an overall diameter of 21.9" and section width of 5.5".

This means that switching to the # AM10130 that you'd have a tire that's 0.10" wider on each side and would be overall smaller in diameter by 0.6". You'll just want to ensure that the there's enough clearance in the wheel well for the extra width of the new tires and then you'll be good to go.

expert reply by: Kevin C