Bottom Bracket Advice
modd1uk
Posts: 18
Hi, my mrs has a merlin dual frame and is in need of cranks/bb. We were looking at these possibilites
http://www.chainreactioncycles.com/Mode ... delID=2962
and
http://www.chainreactioncycles.com/Mode ... delID=7604
or
http://www.chainreactioncycles.com/Mode ... delID=1178
My question is which crankset, and what size BB, the frame has a shell size of 68 but not sure which axle length to buy.
cheers in advance guys
http://www.chainreactioncycles.com/Mode ... delID=2962
and
http://www.chainreactioncycles.com/Mode ... delID=7604
or
http://www.chainreactioncycles.com/Mode ... delID=1178
My question is which crankset, and what size BB, the frame has a shell size of 68 but not sure which axle length to buy.
cheers in advance guys
0
Comments
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" ISIS-Drive cleverly addressed this problem by assigning standard lengths (i.e., 108mm for road double, 113mm for MTB, 118mm for road triple, etc.), so you almost always know which length of axle you need for your cranks, and by using chainline control shoulders, so your chainline would always be as intended. "
Take it that means even for a triple mtb xc its only a 113mm axle length ?0 -
correct.
nick
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Parktools :?:SheldonBrown0 -
ISIS crank and 113mm BB unless you have a E type front mech and then a 133mm E type BB I would believe is the correct one. 108mm BB are road doubles and 118mm are normal triple road cranks.0
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dam i was to slow0
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RPM crankset looks better-tougher chainrings and non-shiny probably more scratch-resistant paint- and it's cheaper.0
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thanks guys, much appreciated it makes life a hell of alot easier having standard sizes, not like the good old square bb days !0
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TBH i would look at a LX HT2 crankset.
nick
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My Pictures.
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<center><font size="1">
"Do not follow where the path may lead, Go instead where there is no path, and Leave a Trail."
<font color="brown"> Sheldon Brown</font id="brown"> <font color="blue">Park Tools!</font id="blue"> <font color="black">Spoke Calculator</font id="black">
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Parktools :?:SheldonBrown0 -
nick, its only for my mrs, she does very lite xc as shes just getting into the sport, the fsa's should suffice for a while ?0
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To be honest, i'd go with Nicks advice.
The reason being is that ISIS bearings die very very quickly, it's inherent to the design.
So while she may only do light XC, it means a lot less money in the long run and you won't have to replace the BB every 3 - 6 months.
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my last ISIS truvative gigapipe lasted well over a year of solid riding. they work ok for xc. i just bought the new crank bros cobalt BB which has a 5 year garente:
but the fsa would be fine for occasional riding0
