Since buying my new shiny B'twin Ultra 700 back in September I've been using it almost daily. My chain is slipping on my big ring (hah) and not catching. I suspect it's down to general wear-and-tear. In fact, looking at my bike stats on Strava i've put 645mi through it so... maybe that's it? I replaced my chain with another 105 model after the winter break and that's catching the rear cassette no bother, slips up and down with ease. I've ordered up a new 50t ring to be safe but would welcome any other diagnosticians weighing in on what might be the issue and if there are any interim measures i can take to make it work that little bit better.