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Bottom bracket compatability. Square taper to hollowtech?

stuart_c-2stuart_c-2 Posts: 805
edited April 2010 in MTB workshop & tech
Hi all,

Today's stupid question. If you have an old style square taper bottom bracket and cranks, can you upgrade to some like a hollowtech or octalink setup? Is the basic design of the bottom bracket shell on bike the same?

My brother has an old 99 Rockhopper and wants to change his chainset, is he restricted to square taper type setups?

Cheers
"I ride to eat"

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