Here is the page for the Michelin 235s
http://www.michelintruck.com/micheli....do?tread=XTE2
and for the 215s
http://www.michelintruck.com/micheli...=215%2F75R17.5
Sorry about the long address. the 215s will fit a 6 to 6.75 rim and the 235s need a 6.75 to 7.5 rim with.
Max speed ratting is 62 MPH on both. When I bought mine it was 65 MPH and that as fast as I like to go when pulling.