just a little update.
Last weekend, I killed my RD on a local group ride in the country.
To put it short, the rear derailleur, chain, hanger is cactus. Not sure how it happened or why but it lunched itself on the flat after an up gear change doing about 25kph, popped the chain off the cassette and wedged itself between the spokes and bottom gear, locking the back wheel up and tearing the RD off the hanger which ultimately then wrapped itself around the cassette with a twisted chain and ending up in a mess. It all happened within a few seconds and I had to think quick as I couldnt pedal, the bike was pulling up fast and and I was still locked in to the cleats, so pretty much fishtailed it to a stopped and ended up getting my left foot out in time to get my balance. It could have ended worse. Lucky it was on the home stretch of the ride.
The bike is at the bike station now (where I bought it from) and is still under warranty. Hoping to have it back by the weekend pending no frame damage.
I expected better from Shimano Ultegra groupsets.
Will report more later