My road bike was serviced at weekend. I was informed of a difference in parts, which I wasnt able to deduce how it happend. I have a 105 10 speed cassette with 11 speed shifters(maybe an 11 speed chain)? Now when I stand up and apply pressure to the pedals the chain slips, happens in all gears and can be a nightmare in the little ring going up 20% hills.
I understand the shifters pull different cable tensions but would this cause massive chain slip?
Any advice would be massively appreciated