The reason I ask about the SM rim, I would like to run a TKC but the off road rim is for a 17 inch 140 Karoo T. The TKC 140 is not imported to the USA I've been told. The SM rim is wider and will accept a 150 which is available in the TKC, but I worry the black rim may not be as strong as the bronze off road rim. I hope some one from this forum might know. The Karoo T only lasted about 2000 miles before it erased itself. I want to ride, not spend every other weekend changing tires.