I rode 250+ hours on the last bike we built and sold and the only issue was one slow leak in the rear tire last summer. if a person is building a mb from scrach, yes fabing and moding and problems will arise, but our bikes do not have those problems, the staton trans bolts right in the frame with 2 grade 8 bolts, the chainline is perfect, not one thrown chain, the wheels are handbuilt with quality downhill rims, and the parts are the best american made parts you can buy. Thompson stems and seatposts, chris king headsets, Hayes disc brakes, and the rest Shimano. The engine was a Honda ghx50 4 stroke and a USA made Staton trans and rear hub, again quality components that last. USA ALL THE WAY!!!