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I need some help please, I have a Trek 6000 and I need to change my bottom bracket. I am also thinking about changing my crank to a bigger size. Right now I have a 22/32/42, does anyone know how much bigger I could go without having any problems? I have road tires on the bike and use it for cross country riding and want more speed.
 

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dirtbag
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By bigger, I assume you mean the rings and not the crank length. Looks like you've got a compact crankset 58/94 BCD and you'll want to get a standard 74/110 BCD. Standard chainrings are usually 24/34/46 but you can go up to a 48t bigring if its speed you're looking for.

Road tires and cross country?
 
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