Weight Weenies
* FAQ    * Search    * Trending Topics
* Login   * Register
HOME Listings Blog NEW Galleries NEW FAQ Contact About Impressum
It is currently Tue Dec 12, 2017 3:21 pm

All times are UTC+01:00





Post new topic  Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Sun Sep 03, 2017 11:29 am 
Offline

Joined: Tue May 19, 2015 4:55 pm
Posts: 48
Location: California
I have a Praxis Works M30 BB (https://praxiscycles.com/product/m30-english-threaded/) and I've been searching for a way to replace/remove the bearings. If someone has done this please advise. I've been looking for a bearing pull tool for this thing. Seems the bearings are flushed and there's no leverage to knock out the bearings.

Alternatively: is there a way to remove the BSA female thread located on the BB frame if there is no way to replace the bearings?

This is on my daughter's specialized Ruby frame. Thanks.


Top
   
PostPosted: Sun Sep 03, 2017 12:24 pm 
Offline
User avatar

Joined: Tue Nov 13, 2007 1:19 pm
Posts: 26
Location: Scotland, UK
You need a blind bearing puller, if you Google them there are plenty available which should fit. They basically expand inside the bearing with a very small lip on the back and then use a slide hammer to pull them out. I'm in the process of ordering one to do the same thing however price is higher than replacement cups etc and you will want a bearing press to reinstall the new cartridge bearings. If you're planning on doing this a few times and you have the tools it makes sense. I've just done a similar thing on my Rotor Pf30 cups and it worked a treat.

Sent from my SM-G935F using Tapatalk


Top
   
Posted: Sun Sep 03, 2017 12:24 pm 


Top
   
 
PostPosted: Sun Sep 03, 2017 12:35 pm 
Offline

Joined: Fri Dec 24, 2010 9:37 pm
Posts: 1360
Location: it's raining, it must be uk
generically, you should be able to get a screwdriver/drift through from the opposite side onto the edge of the inner race and go around the edge gently tapping out the bearing

'proper' tools that should be able to extract the bearings it would be a headset cup remover or blind bearing tool

you'd need to source correct bearings to replace, then get or improvise a press to get the new bearings in (large bolt + nuts, plus thick washers (using the old bearing outer race to press the new bearing in)

by "is there a way to remove the BSA female thread located on the BB frame if there is no way to replace the bearings", do you mean remove the bb from the frame? unless you've a bb tool that fits, looks like you'd need to get the praxis tool https://praxiscycles.com/product/m30-tool/

are you certain the bearings are really shot? first step i'd take would be use a pick to carefully remove the outer seals, flush out all the old grease/dirt with spray solvent, spin them to see if they rotate freely without roughness or play, if ok pack with marine grease and pop the seals back on


Top
   
PostPosted: Sun Sep 03, 2017 1:36 pm 
Offline

Joined: Mon Aug 29, 2016 11:19 am
Posts: 405
Whats the inner diameter of the bearing? I don't know about bb bearings larger inner diameter but for smaller bearings I saw a genius idea on youtube. It's to use something the youtuber called a "magnabolt", simple tool you find in the hardware store. I think it's used as an anker in concrete walls.

You buy one with the correct inner diameter and expand it in the bearing. Then knock the bearing out without having to hit a tiny exposed inner race. You'll have the magnabolt to knock against from the other side.

/a


Top
   
Display posts from previous:  Sort by  
Post new topic  Reply to topic  [ 4 posts ] 

   Similar Topics   Author   Replies   Views   Last post 
There are no new unread posts for this topic. Praxis Zayante Crankset - BB compatibility

in Road

Stolichnaya

4

425

Sun Aug 27, 2017 1:14 pm

Attermann View the latest post

There are no new unread posts for this topic. Praxis Alba / Zayante Chainrings

in Road

iamalex

0

399

Sun Mar 12, 2017 8:49 pm

iamalex View the latest post

There are no new unread posts for this topic. Praxis alternative to 110mm rings on Shimano?

in Road

itsacarr

12

991

Fri Jul 14, 2017 7:43 am

Beaver View the latest post

There are no new unread posts for this topic. Praxis Works chainring bolt torque spec

in Road

SpecializedColnago

4

767

Sat Feb 18, 2017 6:13 am

sp3000 View the latest post

There are no new unread posts for this topic. Attachment(s) RD-R9150 wheel removal issue

[ Go to page: 1 2 ]

in Road

beanbiken

29

2255

Tue Mar 28, 2017 1:05 pm

ms6073 View the latest post


All times are UTC+01:00


Who is online

Users browsing this forum: Apv, benzebub, crn, FIJIGabe, Matt28NJ and 34 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Limited