This was a warranty replacement frame from my sons broken Gary Fisher Hi Fi. 18.5" virtual, 17.5" actual is the Trek sizing. He's totally lost interest in mtn. biking and is frankly to busy with school, job, and friends so it needs a new home. RP-3 DRCV shock with boost valve, full floater suspension with ABP (Active Braking Pivot) and 120mm travel. Comes with a 142 x 12 axle however a kit is available from Trek to use std. 135mm wheels if that's what you have. Frame weight is 6.33lbs with shock, rear axle and seat post QR. $850. Call or PM me with any questions.