Road Cycling · Public discussion

Any experience of threadless bottom brackets ?

Started by Alex Bird · · Last activity · 4 posts · 1,102 views

This thread is locked and is currently read-only.

Thread details

What we know about this thread

Original section
Road Cycling
Published
14 September 2003
Last activity
16 September 2003
Original author
Alex Bird
Posts
4
Discussion status
Public discussion
Total views
1,102
Views / 30 days
0

The navigation and discussion metadata provide context. Posts remain in their original chronological order.

Showing posts 1–4 of 4
Posts remain in their original chronological order.

Text size
  1. Hello, I'm currently trying to make a salvaged frame into a bike, using parts from my current bike,
    as cheaply as possible. Before you start, I'm well aware how cheap a new bike can be, and the
    implications of re-using old kit, it's what I tell people when they ask me to fix cheap consumer
    electronics etc. I know that if you have the time, and can risk the cost rising so it isn't really
    economical, and you don't care, then it's fine ;0) The frame is completely straight and sound. The
    problem is the length of time it was outside; the alloy frame is fine, the bottom bracket was
    immovable. A metal shop removed it, by welding leverage on. There isn't a lot of thread left, though
    it's fine further in. Once we've worked out the right length for my chainset, I intend to fit a
    sealed bottom bracket that screws into itself. These seem to be made by YST, and I am warned they
    are not of high quality. Of course quality is relative, the bike is mainly used on city roads here
    in edinburgh and is a bit of a stopgap, in 18 months I will have finished uni. and might have a lot
    more money to spend, or need a different kind of bike...

    Are there higher quality options for a stripped bb thread? Would thread-lok be advisable? I can't
    see what stops them undoing. Are they _completely_ [censored] (I don't stamp on the pedals half as much as
    I used to) ?

    Sorry about long post, Big thanks for any Advice, Alex

  2. Alex Bird said:

    immovable. A metal shop removed it, by welding leverage on. There isn't a lot of thread left,
    though it's fine further in.

    Shimano low-end bottom brackets are one-piece cartridges, and you can get by with surprizingly
    little viable thread with one of them. I know. Probably worth a try; they are cheap, and someone
    else can use it if it does not work for you.

    --

    David L. Johnson

    __o | It is a scientifically proven fact that a mid life crisis can _`\(,_ | only be cured by
    something racy and Italian. Bianchis and (_)/ (_) | Colnagos are a lot cheaper than Maserattis
    and Ferraris. -- Glenn Davies

  3. "David L. Johnson" <[email hidden]> wrote in message
    news:<[email hidden]>...

    Quoted message said:
    Alex Bird said:

    immovable. A metal shop removed it, by welding leverage on. There isn't a lot of thread left,
    though it's fine further in.

    Shimano low-end bottom brackets are one-piece cartridges, and you can get by with surprizingly
    little viable thread with one of them. I know. Probably worth a try; they are cheap, and someone
    else can use it if it does not work for you.

    I think I might try this, think there might be enough metal there. Fingers crossed, I'll be in the
    shop later...

  4. [email hidden] (Steve McDonald) wrote in message
    news:<[email hidden]>...

    Quoted message said:

    What I would do in this stripped-thread situation, to squeeze more use out of the bike, is this:
    I'd clean all the grease out of the bottom bracket and finish with an alcohol scrubbing. Then, I'd
    apply some metal-mending epoxy putty (JB-Weld is good) to the threads, before installing the inner
    parts. This would cause a permanent lock, so you couldn't adjust the bearing cups or add grease
    later. I'd use the standard putty, not the quick-set type, so I could properly set the adjustable
    cup, before it hardened. If only the right-side fixed cup is stripped, I'd use putty on it only
    and the left-side cup could still be adjusted. Grease would need to be added to the bearing cups,
    but kept out of their epoxied threads during insertion.


    <snip>

    I'll bear this in mind if all else fails; I'm using sealed cartridge bottom brackets though so it
    would be much easier. Tried several today but none reached the undamaged thread, and they didn't
    catch on the damaged thread. I also considered plumbers self-amalgamating thread tape, if I haven't
    just made it up, but there really isn't the thread there to lock to. Have now fitted a
    'screw-into-itself' sealed bb, will almost certainly do the job. When I've put some cables on this
    baby, in a couple of hours, I'll know!

    Thanks for your suggestions, Alex

Active in the last 60 minutes

Active in this thread

0 users · 0 guests ·0 bots ·0 total

No signed-in users are active right now.

No known search crawlers active right now.