Bike Forums - View Single Post - Japanese Bottom Bracket

06-29-10 | 02:49 PM

#5

seenoweevil

invisible friend

Joined: Jun 2008

Posts: 955

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From: Decatur, Alabama

Bikes: Gary Fisher Tassajara hardtail mtb, '01 Rans Wave, '98 Raleigh R700, Mid-80's Takara Professional, '91 Bianchi Alfana

Quote:

Originally Posted by EjustE

I am a bit confused... do you want to change the length of the crank arms to shorter ones? or you want to change the chainrings to smaller ones? Both are doable without changing the bottom bracket:

If you want smaller chainrings keep the crankarms and change the chain rings (possibly you might need a different RD)
If you want shorter arms, look for a crank just like yours (or compatible with your BB, i.e. same make and same time frame ) and just get shorter arms to use. (most Dura Ace/600/and 105 bb work with all 3 kinds of cranks and the reverse - with some exceptions 7410- if made around the same time)

Here is Sheldon Brown's BB size database

Yeah, sorry about the confusion! I want to do both - shorter arms and smaller cranks, at least the 42. Just figured if I were going to that trouble, it would be easier to get an entire compact assembly.

Thanks to you all for the great info!

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