Cycling UK Forum

tim-b wrote:

Was just wondering if anyone on the forum had used the coin tap scenario, and was later proven wrong

There's a reason that Airbus engineers don't go around tapping their aircraft with a coin

This Australian is an expert and has a Youtube channel of CF testing and repair. This example is why you shouldn't rely on a visual inspection alone https://carbonbikerepair.com.au/article ... scan-video
He's not a video editing expert, so stick with it

Fair enough. I haven't crashed my bike though, just gone over a couple of small pot holes. The bike is 10 years old though, so that video puts things into perspective. Cheers.

Thanks for the reply. Makes sense. Was just wondering if anyone on the forum had used the coin tap scenario, and was later proven wrong.

Afternoon all, need a bit of help. I bought a carbon tt bike last year (guru cr 901) which was in excellent condition bar a confirmed paint crack below the seat.

I've recently noticed a small 1 inch crack on the frame, now I've only gone over 2 very small potholes in the last year, so other than that, I've not hit the bike or gone into anything likely to cause a crack.

Now the bike is white, and I'm lead to believe that white paint is applied thicker than other paints and is prone to cracks, being 10+ years old, I would have thought this could be the main reason.

Now, I've done a couple of coin taps on both the confirmed paint crack, and the new crack, and both sound the same. However, I've contacted a carbon repair company and they've said that on bikes, with monolithic laminates, it's sometimes difficult to establish if it is a crack in the carbon.

Anyway, just wanted to know, would it be ok to carry on using it, or should I get the necessary repairs done, I just don't want to be fleeced by the company telling me there are cracks when there aren't. Any advice much appreciated.