Mountain bike frame Material:full carbon fiber Finish:3K,12K,UD Weight:from 1100g With:31.6mm seat post XC-R857Full carbon fiber MTB 26"frameSize:15,17,19,21BB:Regular or BB30Material:full carbon fiberFinish:3K,12k,UDWeight:from 1100gWith:31.6mm seat post (XC-R857) Regular or BB30 OEM 1100g 26" carbon mountain bike frame