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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 06-07-09, 07:20 AM   #1
cbieryla
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Campy bottom bracket/chainline question

Hi,

I am helping a friend source parts for his first fixed gear project. He recently purchased a campy mirage triple crank arm set on the cheap. Having only used Shimano/Sram compatible components thus far, I was unsure which size ISO bottom bracket would be best matched with these cranks to achieve a decent chainline. I realize that he could use spacers in the rear, but I know if it were my bike, I would prefer to not have to go that route, or at least keep the spacers to a minimum. A bit more info...the rear spacing on this bike is 120mm.

p.s. I have already checked to see what Sheldon had to say on the matter, and found very little info as it specifically relates to Campy BB's. If anyone has any info. I would greatly appreciate it.
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Old 06-07-09, 08:23 AM   #2
Bianchigirll 
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WHat year is the crankset? that might make a difference but according to my 1999 Campi catalog the Mirage triple takes a 115.5. if you are not using the inner ring position you might beable to use a shorter one but that may require trial and error.
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Old 06-07-09, 04:43 PM   #3
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Originally Posted by Bianchigirll View Post
the Mirage triple takes a 115.5.
yes.
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Old 06-07-09, 06:17 PM   #4
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Originally Posted by Bianchigirll View Post
WHat year is the crankset? that might make a difference but according to my 1999 Campi catalog the Mirage triple takes a 115.5. if you are not using the inner ring position you might beable to use a shorter one but that may require trial and error.
You can only use the middle and outer chain rings on a triple to get any meaningful gear ratio. If you use a triple BB you are not going to be able to get anything close to a useable chainline.
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