Another BB question
08-27-22, 05:06 PM
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Another BB question
Here are my BB's I have been experimenting with to get my chainline right . Left is a Shimano with 110mm length , right is a cheapie at 103mm . As you can see both drive sides are the same , they get their longer , shorter distance on the NDS side . I need my chain ring to move 4.5mm closer to the frame . Options ?
Thanks , Mark .
IMG_0892 by mark westi, on Flickr
Thanks , Mark .
IMG_0892 by mark westi, on Flickr
08-27-22, 05:15 PM
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Are you certain your back wheel is dished properly to give the cog or cogs on it the proper chain line?
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08-27-22, 07:20 PM
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What cranks are you running? Could be they have too much offset. Not aware of any BB more narrow than 103.
If a double crank being used for a single, maybe mount the ring on the inside?
If a double crank being used for a single, maybe mount the ring on the inside?
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08-27-22, 08:26 PM
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Yes it is a cheapie , I didn't know it was going to be a road crank . Have you any experience with a real track crank off set compared to a road crank set ?
I know of a fix , take the DS threaded cup off the BB and put in a spacer , but I can't get it off .
Thanks , Mark .
08-28-22, 09:18 AM
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How will putting a spacer on the DS cup move your ring closer to the frame?
You perhaps need to look for a proper crankset for a track bike. The spider shape of the crank positions the chain line too. And from the moment you said it was a track bike, then that 4.5 mm more that you need seemed to indicate you probably have a road crank made for a wider chain line.
There are 103 mm BB's out there. Phil Woods makes on if you want. But then you are getting up to the price of a crank.
When the BB was in the bike, did you have enough clearance between the crank and the BB itself to go another 4.5 mm?
You perhaps need to look for a proper crankset for a track bike. The spider shape of the crank positions the chain line too. And from the moment you said it was a track bike, then that 4.5 mm more that you need seemed to indicate you probably have a road crank made for a wider chain line.
There are 103 mm BB's out there. Phil Woods makes on if you want. But then you are getting up to the price of a crank.
When the BB was in the bike, did you have enough clearance between the crank and the BB itself to go another 4.5 mm?
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08-28-22, 10:32 AM
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How will putting a spacer on the DS cup move your ring closer to the frame?
You perhaps need to look for a proper crankset for a track bike. The spider shape of the crank positions the chain line too. And from the moment you said it was a track bike, then that 4.5 mm more that you need seemed to indicate you probably have a road crank made for a wider chain line.
There are 103 mm BB's out there. Phil Woods makes on if you want. But then you are getting up to the price of a crank.
When the BB was in the bike, did you have enough clearance between the crank and the BB itself to go another 4.5 mm?
You perhaps need to look for a proper crankset for a track bike. The spider shape of the crank positions the chain line too. And from the moment you said it was a track bike, then that 4.5 mm more that you need seemed to indicate you probably have a road crank made for a wider chain line.
There are 103 mm BB's out there. Phil Woods makes on if you want. But then you are getting up to the price of a crank.
When the BB was in the bike, did you have enough clearance between the crank and the BB itself to go another 4.5 mm?
And yes I do have a road bike crank and the bike is modified to 120mm spacing . I like your suggestion , I need to get a proper track crank .
Thanks , Mark .
