Bottom Bracket
mark_foden
Posts: 89
Evening all
I am in the process of repairing / doing up my Hardrock sport, I want/need to change the cranks and bottom bracket I need some help / advise on the following -
The shell width taken from the old BB is 68, and I wish to fit an octalink shimano LX crank, therefore I need an octalink BB, all the websites state that I need a BB that is 121mm long for best chain alignment, is this true for all frames ???
Many thanks
Mark
I am in the process of repairing / doing up my Hardrock sport, I want/need to change the cranks and bottom bracket I need some help / advise on the following -
The shell width taken from the old BB is 68, and I wish to fit an octalink shimano LX crank, therefore I need an octalink BB, all the websites state that I need a BB that is 121mm long for best chain alignment, is this true for all frames ???
Many thanks
Mark
0
Comments
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what are the crank part numbers? or year? or colour?"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
Parktools :?:SheldonBrown0 -
The crankset I would like is the Shimano LX Chainset Octalink M572 & the BB is Shimano LX Bottom Bracket Octalink ES51
Thanks 4 Your help0 -
Same one I have, this crankset specifically needs the 121mm BB. It is a function of this chainset, not your frame (to give a specific chainline).
The 68mm you refer to is the shell width of the bottom bracket. make sure you get the 68mm and not the 73mm.
And a great choice of crank!0
