That's funny, the 'Doublewide' Rim was the one I had in mind for this use, I think they're around 40mm or so. If you have the time, I'd love to see pics of an endomorph on a singletrack rim. I'm just trying to get away without building a LargeMarge wheelset that I can't use for another bike. The 'doublewide' rims I can put on my other 26" bikes with 'normal' size tires..mtnbikerx said:Plum, your problem will be with the rear triangle. I took a stock Vicious Cycles 26 inch fork and used a Porta Power to spread the legs wide enough for the tire to fit (used a skewer to hold the dropouts stable). These Endomorphs are HUGE. Although they can be thought of as 29" OD, the sidewalls are 100mm wide (on Remo rims). I'll mount one on a Sun Single Track for you and measure the sidewall to sidewall if you want. However; a 32mm wide rim would bring the beads way to close together to support the width of the tires. You might get away with a DH wide rim like a Sun "Doublewide".