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Need help with bottem bracket

Old 07-22-09, 07:59 PM
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Jordan5
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Need help with bottem bracket

I have an old frame and am building it up. I have everything but my crank set. I have no idia what size bottem bracket to get for my bike. im looking to buy the crank set off ebay and the bottom bracket off the web nashbar probobly. Takeing it to my LBS is out of the qwuestion they have horrible customer service.




Thanks for any help
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Old 07-22-09, 08:12 PM
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caRpetbomBer
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Looks like a BMX bottom braket. You can get a converter for a Euro type bottom bracket.

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Old 07-22-09, 08:48 PM
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Is that possible it's on a road bike
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Old 07-22-09, 09:39 PM
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Originally Posted by Jordan5 View Post
Is that possible it's on a road bike
by bmx he means american bottom bracket. they were used on low end bikes with one piece cranks. in order to run modern 3 piece cranks you need an adapter like the one pictured above.

I don't know much about the adapters, but the cranks you buy will determine was size bb you need to get chainline right.
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Old 07-22-09, 10:12 PM
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so if the cranks i buy need a 108mm spindle i need to get an adapter to fit that?
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Old 07-22-09, 10:25 PM
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no, the adapters are all the same.

the bottom bracket you need will have a 108 spindle. good luck.
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Old 07-23-09, 07:43 AM
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Thanks very much
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Old 07-23-09, 12:38 PM
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i dont want to put another tire thread in the section for there a tons of them so i will ask my qwuestion here. were is a good place to buy 700c x20mm tires and tubes. nashbar dosent carey any.
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Old 07-23-09, 12:40 PM
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try your local bike shop? you might have a hard time finding 20mm tires anywhere. just go for the 23mm.
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Old 07-23-09, 12:43 PM
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Originally Posted by caRpetbomBer View Post
Looks like a BMX bottom braket. You can get a converter for a Euro type bottom bracket.

this is the part you need it is an ashtabula bb or you could go one piece
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Old 07-23-09, 12:54 PM
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will a 700c x 23mm work on these? or only the 700c x20mm?

http://cgi.ebay.com/NEW-RED-VUELTA-T...3A1%7C294%3A50
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Old 07-23-09, 12:56 PM
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you can probably run up to 28s on those just fine. 25 fo sho.
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Old 07-23-09, 01:02 PM
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23 will work but you should run something fatter and more comfy
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Old 07-23-09, 01:20 PM
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I'm guessing the 20mm size specified refers to the width of the rim, and probably the exterior width which isn't a particularly useful measurement. I've got a rim that's 18.5mm wide that I run 35s on for cyclocross.

What crank are you looking at that uses a 108mm bottom bracket? Is that to give you a 42mm chainline?
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Old 07-23-09, 01:28 PM
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What frame is that, exactly? Those bottom brackets only come on old low-end bikes. For the price of that adapter, you could probably buy a new frame.
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Old 07-23-09, 01:28 PM
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20mm is either the bead with on the inside or the over brake surface width it is non specific but it gives you a good idea irregardless
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Old 07-23-09, 02:09 PM
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Originally Posted by Raiden View Post
What frame is that, exactly? Those bottom brackets only come on old low-end bikes. For the price of that adapter, you could probably buy a new frame.
You can get the TruVativ adapter for under $20, so you might be able to buy the same frame for that.
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Old 07-24-09, 10:13 PM
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How do iknow how long the spindle needs to be for the chain line then?
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Old 07-24-09, 10:24 PM
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I was thinking of posting my BB troubles in a new thread but I'll just ask here. I am upgrading my conversion with a new crank and need to straighten my chainline. I don't want to buy an entire new bottom bracket so I was thinking I could buy a 107mm spindle, something like this http://www.icyclesusa.com/catalog/ri...et-spindle.htm and just replace that and use the existing BB. Is this right? I have a 1980 schwinn traveler so I'm assuming it's a standard sized bb and not oversized.
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Old 07-27-09, 08:22 AM
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How can i tell what size i would need? the e-bay seller said a 103mm would be nice but a 108mm would work aswell. dose this seem right?
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Old 07-27-09, 08:46 AM
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Depends on the crankset.
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Old 07-28-09, 07:47 AM
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So if i got this crank set what size spindle would you get and how did you determin that?

http://cgi.ebay.com/NEW-FIXED-GEAR-T...d=p3286.c0.m14
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Old 07-28-09, 08:31 AM
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Originally Posted by Jordan5 View Post
So if i got this crank set what size spindle would you get and how did you determin that?

http://cgi.ebay.com/NEW-FIXED-GEAR-T...d=p3286.c0.m14
they recommend 103-107

http://www.origin-8.com/product_deta...+ARMS+%26+SETS
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Old 07-28-09, 08:42 AM
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would it make a differnce if i went with a 108? i cant find a 107
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Old 07-28-09, 08:50 AM
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Originally Posted by Jordan5 View Post
would it make a differnce if i went with a 108? i cant find a 107
not much.

plenty 107's, if you look.

http://www.harborcountrybike.com/Pro...ST1996&click=2
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