i was thinking about this the other day when i was on my turbo. because the back chainstay/seatstays are locked in place, do you think this puts extra stress on your bike when you are pedalling? i seemed to be getting a lot of flex in the frame i was riding. don't know if that's just coz it was an old frame but it made me wonder if having the rear end locked down caused extra stress on the bike or maybe whether it just seemed like a lot of flex coz i wasn't going anywhere and was watching my bike rather than the road. waddyathink?