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I'm having trouble installing a new crankset. My existing bb is octalink. It's ok so I've left it in place. So I've bought shimano octalink crankset to replace the old worn out rings and cranks. The new crankset looks exactly same as the old in terms of compatibility. But no matter how I grease or try to carefully tease the crank onto the spindle (will a mallet or some man force), it will only go on about half the way. Thus I can't set up my front derailleur properly. Any ideas?

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allez neg [497 posts] 2 years ago
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I'm not certain if all octalinks were the same, I have a nagging suspicion that road and MTB octalink splines were different, and Dura-Ace different again.

That said, if the new chainset splines all line up and it goes onto the splines ok by hand is it just that the new chainset design requires an octalink bb with a longer axle length?

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RobertWilkinson [3 posts] 2 years ago
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Allen neg thanks. Pretty sure bb length is fine. Splines line up and drive side chainset goes on only 50% by hand.

Strange cos non drive side sides fine.

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RobertWilkinson [3 posts] 2 years ago
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Non drive side fits fine. Sry

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PJ McNally [589 posts] 2 years ago
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Hi,

Having recently replaced an octalink bb, yes, they are not all the same! Search for octalink v1 or v2, or look at wikipedia, I updated the article!
http://en.m.wikipedia.org/wiki/Bottom_bracket
Basically road vs mtb, as usual.