Hi all

The first thing I should say is that generally we don’t want toencourage people to make repairs to structural and safety critical part like abike frame without explaining that any work undertaken would be at your ownrisk, any advise given is given in good faith and no guarantees or assurancescan be made as to whether a repair is appropriate or safe to do. If in anydoubt, either replace the frame or take it to a professional.

 With that said, if you do wish to undertake arepair yourself then it’s often perfectly safe and easy to make a good repairand restore strength to the frame. If the damage has broken or split the carbonfibres themselves (i.e. it is structural damage) then you can add new layers ofcarbon fibre to the part to return the original strength and prevent furtherdamage.

 If you do make a repair like this then you shouldbe aware that you will always be able to see where the repair has been made.You can restore the strength in this way but not the original appearance. Tomake a structural repair to a bike frame I would recommend our Fishing Pole Repair Kit. Although it wasdeveloped to repair fishing poles, repairing a bike frame is done in exactlythe same way.

 The more fabric (and resin) that you add (i.e.the more times you wrap the fabric around) then the more strength you will addbut it the same time the repair will look bigger. The Fishing Pole Repair Kituses a very special, lightweight 90gsm cloth which allows very thin andlightweight repairs to be undertaken however if the damage is significant andyou intend to add 1mm+ or wall thickness by way of the repair then you shouldconsider additionally purchasing a small Carbon Fibre 2/2 Twill 3k 195g - Mini Roll 0.3sqm.This cloth is more than twice the weight of the cloth included in the FishingPole Repair Kit and would be ideal for larger repairs to heavier damagealthough if the repair is small you will be fine with just the 90gsm clothincluded in the Fishing Pole Repair Kit.

By using some UD you could in theory have a thinner repair if the original used UD as you'd be copying the original layup rather than building extra strength with a thicker woven cloth lay up.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Hi Warren

Ideally in one session, but you can add to it later by keying the surface properly so the epoxy bonds.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant

Hi Warren,

Pretty much a standard repair as per the video.  Make sure all loose material has been removed and the area has a good key.  The square section can make things a little bit more awkward but should still be achievable.

Remember you may not be able to see all the damage or know exactly how deep the damage goes so be sure to add enough reinforcement to strengthen it sufficiently depending on wall thickness of tube etc.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant