We bought the larger size after discussing whether the smaller size would fit. We chose the right version without paying much attention to the product's characteristics. (The product dimensions in the description of 15 x 7.3 x 4.9 inches are just wrong.) More important than wheel size on a two-axle trailer is the total distance from the back of the rear wheel to the front edge of the front wheel. . It's about 66 inches on our trailer. The 30-32 inch cap fits well, not so tight that it's difficult to put on and not so loose that it sags and doesn't bottom out.
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