Join Date: Jul 2006
Location: Toronto (again) Ontario, Canada
Bikes: Norco Bushpilot (out of commission), Raleigh Delta
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Originally Posted by brundle_fly
A lot of half decent bikes now come with the external bottom brackets.Do you think this is the way to go,or do the older designs still prove to be more reliable
How is the longlivity compared to the others? I assume that using larger bearings closer to the crank arm(as with the external) will make them last longer?
External bottom brackets were invented because they wanted to make the axle bigger on some designs, which meant smaller bearings, which would wear out faster. Some people say it makes things stiffer, some think it's a marketing scam to promote incompatability in bottom brackets, still other people say it's bling factor and the remaining folks don't give a rats right ear, about internal vs external. As for bearing size, most externals use a larger diameter axle, and the same size bearings as an internal.
It really comes down to the requirements of the crankset, if you want a specific crankset, and it requires a certain bottom bracket, use the one that is recommended, and don't worry about it.