thanks for info. cost aside, wondering whats likely to give most comfortable result- moustache, drop or trekking bars. so far only exp is with drop bars on road bikes, and mb bars that hurt my wrists on long ie 40 plus mile rides. also wondering if mb3 frame is worth playing with because its a relatively stout frame, straight tube chromo, but the rockhopper above is prob. similar. the one benefit of an mb conv. over my trek 520 for example is ability for fat tires. but between the extra weight of frame and fat tires im probably 6 pounds over a trek 520 with 28mm tires. not sure how that would feel on daily 30 mile roundtrip commute or 50 mile sunday ride. ill probably proceed with conv. but not sure what ill use the bike for esp. with the fat tires. the diff with the diff type of bars is trekking and most moustache are 25.4 (I see now i can get 26 moustache but only nitto for close to $80) and drops are mostly 26 (I'd prefer that) so i have to decide which tall stem to get. i dont want to shim a 25.4 bar.