Specialized Rockhopper Comp 29 M4. Before and after pictures. Stripped it down to bare metal. Rebuilt with almost all Promax components Cranks ,bb ,stem, headset, post. Kept the Deore derailleur. New Shimano cassette. Wanted a 29er bmx but 2 knee and 2 ankle surgeries didn't allow it. So I made this 1x 9 29er.