Hi all

I am doing damage to my frame in the inside of the chainring. I'm on a mechanical 2x10 Shimano 105. Rotor chainring 53-38 and 160 mm Rotor cranks. It is a carbon Felt IA10 frame, and it is very damaged now.

I do most of my training indoors, and drop my chain almost daily. I use a dumb Cycleops magnetic trainer with Zwift.

I notice the programs sometimes ask me to jump from, say, 250 watts at 60 rpm, to 115 w and 85 rpm, or sometimes to hold say 230 watts, but jumping between 60 rpm to 100 rpm.

This means I should use my front derailleur a lot, since obviously I cannot control my resistance without shifting, and sometimes even going through the 10 speeds I cannot achieve the combination the program asks me.

I'm guessing this is causing the chain to drop, I've checked and without load it shifts pefectly, no rubbing or touching chain even with a crossed chain. I know I should not do this, but sometimes I cannot find the right combination of power/cadence without crossing it, I don't know if that is also a cause for dropped chain in the front.