Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.


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.
  Reply
#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
  Reply
#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
  Reply
#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 👍

   


Attached Files Image(s)
   
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
POLL: Are non-recumbent riders looking a...
Yesterday 12:37 PM
Rusty chain inspite of cleaning,lubing
Yesterday 07:19 AM
New rider — happy to be here
Yesterday 05:01 AM
How did your cycling start?
06-10-2025 08:01 PM
What happened to Hövding?
06-09-2025 01:42 PM
"There's been better times
06-09-2025 10:41 AM
Is anyone riding with music?
06-09-2025 12:46 AM
Good morning form Alberta CA
06-08-2025 10:49 PM
Where are you from and What is your favo...
06-08-2025 04:31 PM
The great thing about trikes
06-08-2025 09:21 AM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Criminal
26 posts
no avatar 2. rydabent
18 posts
no avatar 3. GirishH
17 posts
no avatar 4. Flowrider
11 posts
no avatar 5. SPINMAN
10 posts