I've been looking for this info - but for some reason cannot find it and have not reached the owner of a frame I might be trading my PX pitbull for. Does anyone know if the Surly instigator will take a 24" rear (with canti's)? Also - thought I'd throw this in - anyone interested in trading a solid FR hartail of some sort for a PX Pitbull w/ Fox Vanilla RLC 125, PX tubular cromo cranks, PX LMF rims laced to PX (front) XT (rear) - can give the rest of details if anyone is interested, just in case the deal on the Surly falls through? I love the bike - but I would like something not quite so compact that I can take to the skatepark OR on trails, should I feel so inclined.