I've now received my new frame from
Ribble so as promised a few pics showing the extent of the downtube cracks on my old CGR Ti:
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The frame was just under 3 years old with about 11,000 miles on it, mostly ridden on the road but probably with a few hundred gravel miles as well.
I think the bottom right hand crack may have originated from a sharp corner in the welded in cable port surround, causing a stress raiser which eventually gave way causing the catastrophic failure you can see in the pictures. I feel lucky to be alive and undamaged as just before my last ride in the New Forest I checked these cable ports as the screws have a habit of coming loose and I'm certain they didn't exist then, so they must have propagated in the 20 odd miles of that ride. About 1/2 mile from the end of this ride I was going down hill at 29.4mph (according to Strava) so if the cracks had completely gone around the downtube the results don't bear thinking about!
Anyway Ribble have been very good and replaced the frame without any argument and have been very polite and efficient in arranging delivery of the new frame to me. The only hiccup has been the new frame has external headset cups which I cannot fit so it's in the local LBS to have them fitted and should be ready tomorrow, hopefully I'll be back out by the weekend!