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Yes, you can. You can go from higher speed chains (9 speed) down to lower number of gears (such as your 6 speed). It isn't till you hit the 11 speed chains that it becomes a pain. a 10 speed chain will fit down to a 7 (personal experience). And a 11 will fit a 10 with no problem. That said, the advantage to a 6,7,8 speed chain is that they are thicker and ...


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It's just an older style of BB. It's a square taper BB. Simply remove it and it should indicate width of the axle and the cup size (very likely 68mm). Then go order a Shimano BB-UN52 for less than $20 online. It'll outlast the rest of the bike. BTW, you can still find these cranksets on ebay. Good luck!


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The most important measurement is the bolt circle diameter or BCD. This is the spacing that the mounting bolts use. On a 3x crank there should be 2 BCDs, one for the inner 'granny' ring mounts and one for outer mount used by the middle and outer ring. There are a variety of BCDs is use (see http://www.sheldonbrown.com/cribsheet-bcd.html). The standard is 104 ...



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