The diameter of the ST wheels is the same as the LPR's but I tried to the LPR's on my ST pro wheels and they will not fit. The lip of the rim is different than the lip of the tire and will not fit in. I am sure you can probably cut the tire to fit but I did not want to do that so I bought the Losi LPR rims. Also the st rims are a 1/2" wider than the LPR rims and tires and the tire looked it it would stretch a bit due to the extra width.