Hi

I’ve just noticed the small aluminium protection plate on my Checkpoint on the chainstay behind the crank is starting to come loose. Carbon frame. What adhesive would you recommend I squeeze in there to re-secure it?

Good actual use for gorilla glue (aka, dries slightly rubbery). Clean all the remaining adhesive off the two parts, degrease, and apply a SMALL (ie, like the size of a normal black bean) amount of adhesive to the plate. Apply the plate to the frame, fixing it in place with a couple of pieces of masking tape to prevent it from moving. Follow up by wrapping the area tightly with a spent bicycle tube (this step is important, because gorilla glue/most other "regular" adhesives expand when they cure).

I might just remove it completely and just wrap it with vinyl tape (electrical tape) in the color of your choice. Or if the surface is smooth enough the clear polyurethane tape that most manufacturers use. What most of us refer to as helicopter tape.

I use rubber cut from an old innertube, wrapped like bar tape and finished with a zip tie. It deadens sound and I think offers better protection than PVC tape. Polyurethane tape is quite effective but the edges of the thicker stuff tend to be vulnerable to lifting on smaller diameters - looks better than bits of old innertube, but is perhaps less permanent.

Goop trim adhesive.

The problem with old inner tubes is that they degrade quickly. I use them to cover my seat clamp area to prevent egress of water & grime into the seat tube. But they only last a few years.

Since carbon frames are built with epoxy resin, I don't know why you wouldn't use the highest strength epoxy you can find. Better yet, contact the frame manufacturer and ask them what adhesive they used. (Then again, it failed, so there's that.) THEN I would consider wrapping the area with durable tape. I wouldn't go without the plate.

Yes, I meant to add "keep the metal guard, whatever you might wrap it with".
I think epoxy is too permanent, you might want to replace the guard with a differently shaped one, or remove it so a potential future buyer could see the chainstay is not damaged. I might try hot melt glue as a sticky but peelable option. Otherwise there are some very grabby double-sided adhesive tapes. Or use many small clear zip ties with the pawls tucked out of sight.

3M's VHB tape I think is tough enough and can be removed later if done with care if you slowly 'saw' through it with monofilament fishing line.

You can buy a lifetime's supply (if you only use it for this particular task) at any local hardware store for less than a middling size cup of coffee.

(This post reminds me I need to pull the cranks on my Tarmac soon, see just how bad the clearcoat got scuffed last fall when I dropped chain....)