Threadless bottom bracket

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  • Hello,

    I'm considering fitting a threadless bottom bracket because one side of the threads are worn inside the frame. Do you know of anywhere in London I can get threads cut out of the frame to get a threadless bottom bracket fitted?

    Thanks

  • why not just get the threads recut?

  • i did but there is not enough thread left at the same size cut

  • I was having the same problem, and at the end the only solution I had was weld together frame and BB, I know is quick bestial aproach but... works.
    The BB, never give problems, imagine to have to change it.

    The bike was my beater, I did not mind, diferent history if yours is something like a mercian o BJ.

  • Well places like Argos in Bristol will drill out the shell, put in a sleeve of steel and recut threads into that, meaning that you can put in a normal bb again.
    But, in answer to your actual question, can't help you - maybe someone like Roberts or Witcomb would have the means to do what you want

  • This is what you need:
    link

    Oh, and you don't have to worry about smoothing the threads of the BB shell, the lack of threading means that it doesn't affect the installation.

  • if I know this before.... £20.

  • bikefix can shrink the bb shell and re cut some new threads and re face it. cost me £40. Best money i have ever spent on my bike, frame was good for scrap otherwise. i tried threadless bb's, but had a few scary moments with them unwinding while pedaling along.

  • if you can recut the threads for 40 quid do that.
    I haven't had any experience with recutting threads, but have with threadless BBs.
    The recut BB will be more secure for sure.

  • thank you all for your input, it is much appreicated.

  • I've just ordered one of these and I have no idea how to fit it.... Does it need a press like an headset? or does it just sit in? It's going into an old road frame 68 shell, 110 wide for a conversion.

  • I've just ordered one of these and I have no idea how to fit it.... Does it need a press like an headset? or does it just sit in? It's going into an old road frame 68 shell, 110 wide for a conversion.

    I've been looking to get one of those, let us know how it goes. My BB shell is stripped but it still works fine (i think anyway) but would likely invest in a threadless if it all went wrong.

  • I got the threadless bottom bracket fitted, it fits together really well and works but keeping it really tight is the problem, the reason is the bracket works by compressing together onto the frame. I'm not too sure how to keep it constantly tight though?

  • Did you go for the one at sjs?

  • yes

  • You really need to have the seating faces chamfered at 45 degrees. Once done the BB cups get a much better grip. To do this properly you'd need a special tool, some LBS can do it. If you're very careful and patient with a half round file and some engineers blue you can do it yourself.

  • Otherwise, Loctite.

  • a bmx shop might be a good place to go to get it fitted or get you're frame prepped for fitting.
    quite a few bmx frames use threadless bbs

  • You really need to have the seating faces chamfered at 45 degrees. Once done the BB cups get a much better grip. To do this properly you'd need a special tool, some LBS can do it. If you're very careful and patient with a half round file and some engineers blue you can do it yourself.

    This is what they just told me at Mosquito.... my fame is so stripped on one side that it's perfectly chamfered, the other is fine, so I'll use a bit of glue, or maybe I'll just keep tightening it up and see how it goes. It's only for use on a shitty conversion for locking up in Hackney.

    I'm now looking for a BB tool to get it on.... anyone have a cookie cutter style one I could borrow for the afternoon? I'm in Islington

    xx

  • Bump.

    Does anyone have any recommendations as to which threadless bb to go for?

    YST seems to be the cheapest
    Acor
    Spa
    Ofmega
    VO Gand Cru - most expensive, but the design sounds better, so is it worth the extra?

  • I fitted a YST threadless on a colleague's daily ride 6 months ago and it still runs smoothly and hasn't come loose so I would recommend it.

    I was going to buy it from Hilary Stone but it was cheaper on eBay so got it there, around £16 with P&P from memory.

    You will need 2 Shimano type BB tools & wrenches to fit it.

    Cheers

    Vince

    Bump.

    Does anyone have any recommendations as to which threadless bb to go for?

    YST seems to be the cheapest
    Acor
    Spa
    Ofmega
    VO Gand Cru - most expensive, but the design sounds better, so is it worth the extra?

  • I have a Prestine bottom bracket, you can get it from SJS, has been in my bike for 3 years now and not come loose, just use some grease and torque it up, works wonders.

    When it was first installed it was installed dry, came loose after 3 weeks or so, then I tried it with loctite, same story, finally I installed with grease and it torqued up nice and tight, hasn't come loose since. My bike was also modified to take a Mavic threadless bottom bracket so the shell was chamfered away at 45 degrees meaning the bottom bracket would not fully close so had to fill the space with a plastic space, I think the compression of this by the BB has helped it stay in place as well.

  • reawakening this as need some help!

    I have lovely Mercian that requires using a threadless bottom bracket. My LBS fitted a YST bracket but after reading online they don't have a great rep - I'm currently riding single speed and this will but more pressure on the BB. The velo orange is expensive but seem good - what are peoples experience - I cant find the Prestine one mentioned above. Any help on this would be great

  • Hey Joe, I think the YST and Prestine are pretty much the same, that same BB is still inside my bike running fine! I would not worry about it the pressure on the BB, the biggest issue you will have with a threadless BB is it coming loose, if it has been installed correctly, which your LBS will have done you'll be fine. Ride it until you have an issue then fix it and ride it some more.

  • Hi

    Thanks so much - that's incredibly re assuring to hear that your BB has had such a great life span

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Threadless bottom bracket

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