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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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#4
(09-29-2021, 08:06 PM)Criminal Wrote:  
(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?

Hello,

I'm new here and I'm aware this is a necrothread. However, it pulls up as one of the first Google results for the Boundary bottom bracket, especially when searching as to whether there is a cartridge that will fit.

The bottom bracket most definitely is NOT sealed cartridge (see attached pics.) I'm trying to find a cartridge as my bottom bracket keeps loosening up and developing a ticking when the right pedal is at about 3:00, and I want the thing on hand before tearing into it again. I'm lazy, so I'm researching while eating pizza instead in the garage getting greasy 😆

If I find the answer, I'll post back to this thread so folks finding it on search engines will have an answer 👍

   


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