Another dept-store bike question...
Are the bottom-bracket bearings on dept store bikes generally upgradeable at all? Also are all the wheels on current MTB's the same O.L.D.?
I am pondering building a HPV, but I don't have much of any bicycle parts on hand and what I am planning may not be ridable.... so what I want to do is, strip/cut up a dept-store MTB and use the pieces off it, just to see if I can get the thing to basically work. I have found a steel-frame 3x5-speed MTB
for $80, which is easily less than I would pay rooting around for pieces separately online.
If the HPV happens to work out fairly well then I'd want to upgrade some key parts, as I know that dept-store bikes tend to have lousy BB bearings (the bike comes with 1-piece steel cranks, so does that mean it's a BMX shell? And does that impose any limitations on my crank choices later on? I would want to put a cheap generic road triple in).
Also the MTB only has 3x5 gearing, and I'd want to put a 9-speed wheel on it eventually....