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Bottom Bracket sealed bearing upgrade, Schwinn Boundary
#1
Schwinn Boundary bottom bracket bearing let go. I would like to upgrade them to sealed bearings. Threaded frame bottom tube 35 mm nut thread od. x 73 mm wide.
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#2
(09-28-2021, 03:30 AM)Smartbird Wrote:  Schwinn Boundary bottom bracket bearing let go. I would like to upgrade them to sealed bearings. Threaded frame bottom tube 35 mm nut thread od. x 73 mm wide.

I thought they used sealed bearings. Do you have a photo of the old bottom bracket?
Ride Fast, Be Safe!
Howard
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#3
Do you mean a sealed cartridge? One that goes into a Standard Threaded BB?

You need to measure the axle of the one you have after you remove it.

Then you get the same size sealed bottom bracket for 73mm shell.

For example,

122.5 x 73

https://cambriabike.com/products/shimano-un300-square-taper-bottom-bracket?variant=32171611095114&utm_source=googleshopping&utm_medium=cse&utm_source=google&utm_medium=cpc&adpos=&scid=scplpGM060120-11&sc_intid=GM060120-11&gclid=CjwKCAjwndCKBhAkEiwAgSDKQTD4hn_ga3q152Ne8ik62ySTWf93OcMbviKe5d0xyqFMgd​1w32AeVhoCSsUQAvD_BwE
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