The most common bolt pattern for a 15" trailer wheel is 6 on 5-1/2" so this is very likely what you have now. In order to choose the correct spare you just need to know your tire size. The Westlake ST225/75R15 Radial Trailer Tire w/ 15" Silver Mod Wheel part # LHAW124 for example uses a 225/75-15 tire (load range e) with 6 on 5-1/2" wheel.
I have attached a full list of all our wheels/tires in the wheel size you mentioned as well. view full answer...
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