bottom bracket spindle length
12-08-11, 06:46 PM
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bottom bracket spindle length
Hello everyone,
So I am building up an old Campania frame and have to get a bottom bracket and crank. The crank i'm looking at getting needs a spindle length of 108mm, this is what the guy on JensonUSA chat told me. The crank is Retrospec 3 piece crank. Now for my bottom bracket options i am looking at the Shimano UN54 since i have a 70mm shell width. My options for spindle length on the bottom bracket are either 107mm or 113mm. Which one should i choose if I am making this a 1 x 5 bike NOT a fixie?
Thanks
So I am building up an old Campania frame and have to get a bottom bracket and crank. The crank i'm looking at getting needs a spindle length of 108mm, this is what the guy on JensonUSA chat told me. The crank is Retrospec 3 piece crank. Now for my bottom bracket options i am looking at the Shimano UN54 since i have a 70mm shell width. My options for spindle length on the bottom bracket are either 107mm or 113mm. Which one should i choose if I am making this a 1 x 5 bike NOT a fixie?
Thanks
12-08-11, 06:58 PM
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You don't have all the needed info, because many spindles are asymmetric, meaning they're a few millimeters longer on the right side.
But assuming that both are symmetrical go with the 107. It's a difference of only 1/2mm per side, and makers don't write their specs that close.
But assuming that both are symmetrical go with the 107. It's a difference of only 1/2mm per side, and makers don't write their specs that close.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
12-08-11, 07:15 PM
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https://harriscyclery.net/product/shi...24tpi-1802.htm
Thanks! ^ that is the bottom bracket I am looking at. Should that 107 work for my needs?
Thanks! ^ that is the bottom bracket I am looking at. Should that 107 work for my needs?
12-08-11, 08:05 PM
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Should ? no clue, Retro Spec ? it is not a known crank, who are they?
get several lengths .. to make sure , and return the ones that don't work ..
Generally,
Low profile cranks use a short spindle, often symmetrical
wider profile type sit out further , come back in, use an Asym BB..
and need a longer spindle to place the chainring in the same place
the right angle type take the longest spindle. but can be lowest 'Q'
Guess if Jenson sold you that , go with what they said.
get several lengths .. to make sure , and return the ones that don't work ..
Generally,
Low profile cranks use a short spindle, often symmetrical
wider profile type sit out further , come back in, use an Asym BB..
and need a longer spindle to place the chainring in the same place
the right angle type take the longest spindle. but can be lowest 'Q'
The crank is Retrospec 3 piece crank.
Last edited by fietsbob; 12-08-11 at 08:19 PM.
