Fix Debonded Giant Bottom Brackets

This is a Giant Defy with the Common Debonded Bottom Bracket Shell problem. This time it debonded and bought part of the frame with it. A classic line from mechanics is to just use Epoxy glue to stick it back in. This does not help with the bearing alignment or the correct diameter to help propper bearing function.
In this video I show you how I fixed this issue. Taking into account the expansion from the glue, and the concentricity of the bearings.
The repair worked out perfectly.
the Glue we use is called
Vuduglu from Easy Composites.
www.easycomposites.co.uk/vm10...
I would suggest picking up several nozzles as they are single use items.
When choosing a retaining compound consider the gap fill, viscosity and cure time of the product. the Henkel website will help.
www.henkel-adhesives.com/uk/e...
The Bottom bracket used in this case was the Praxis M30 for BB86 to accept the Infocrank PowerMeter Crankset.

Пікірлер: 86

  • @thetravellingwhiteleys9594
    @thetravellingwhiteleys9594

    As a bike mechanic I love watching your channel. Personally I would be very apprehensive about tackling a repair like this. Kudos to you for taking it on

  • @Sirmellowman
    @Sirmellowman

    it sounds crazy to say but after how many years of established bike mechanic techniques this shop is still pushing the limits and still working out new ways of solving problems. you would think its all been done and figured out by now but clearly not in the slightest.

  • @becyk_du_quebec
    @becyk_du_quebec

    Most bike shops in Canada would never do this kind of repair, amazing job and very well done, wish we had bike shops like yours here...

  • @dominicbritt
    @dominicbritt

    One very lucky giant owner!!

  • @kevinfrost1579
    @kevinfrost1579

    Nice to see great job Paul, thorough as always. Customer ought to be delighted 👍 Chapeau

  • @ArdGeal
    @ArdGeal

    Top job, I'm always wary of carbon frames and press fit, but good to learn something anyway and good tip about the loctite info!

  • @JibbaJabber
    @JibbaJabber

    One giant problem, one giant fix.

  • @mike_f
    @mike_f

    Another great video. So wish I had someone in USA near me with such attention to detail and competence.

  • @neilk22
    @neilk22

    Brilliant work 👌

  • @oftankoftan
    @oftankoftan

    Great job. I don't know of many LBS that would fix something like this. Or

  • @mikekelly1771
    @mikekelly1771

    Master class!

  • @caveboy9988
    @caveboy9988

    Genuinely impressed. Love it! Most would have written that frame off.

  • @MrDazP1adv3ntures
    @MrDazP1adv3ntures

    That looked like a well thought out and researched repair and your explanation was simple to understand. I do worry about my PF30 BB set up on one of my bikes where the bearing shells appear to be a bonded alloy insert like on this bike you featured. So far I have replaced the BB 3 times without any issues.

  • @felixjackson2670
    @felixjackson2670

    Good job. Have performed various Carbon Frame repair jobs and done properly,as you have done here..with careful precision and sometimes the help of websites regarding materials and application will be as good as new..ESPECIALLY in our throw away world where most folk do not have endless amounts of cash to simply buy another bike when things go wrong. Love your content. Thanks.

  • @dominicstockton7102
    @dominicstockton7102

    Ah, that Voodoo glue is amazing. Got myself out of a potentially very expensive carbon steerer tube problem with that and an extra long expanding bung.

  • @MrGarycoww
    @MrGarycoww

    Love it ❤

  • @NelsonSherry
    @NelsonSherry

    It's really awesome having someone producing a KZread channel experimenting with and showing their work with some of the higher end type repairs that I enjoy exploring and doing. THANK YOU! Two thoughts: 1) As thin a layer of epoxy as used in slip-fit inert repairs, I've never been particularly concerned about expansion of the epoxy and have not found any measurable decreased circumference contributable to it. Have you found epoxy expansion to contribute to insert shrinkiage? 2) I was surprised to see you insert the fitting into the frame having shown to only put epoxy onto the frame surface instead of both the frame surface and the insert. I have always put epoxy on both surfaces to reduce the likelihood of any voides even though it does increase clean-up on the outside of the repair after the fact. 3) Excellent trick using separate inner and outter drifts for the bearing you don't have a specific drift for! 4) Great Loctite use and research tips! Again, surprised not to see you put the retaining compount on both inner and outer surfaces to minimize post-installation gaps in the "adheasive". Thanks again for an enjoyable and informative channel.

  • @Bloodyfallsmassacre
    @Bloodyfallsmassacre

    "...Powermeter with a 24mm axle that actually works." Well... there are quite a lot. Stages, 4iiii, Sigeyi.

  • @pab2611
    @pab2611

    Great repair job 👌🏼, I with there where more stores with this level of craftsmanship.