I have the Shimano Dura Ace 7800 group on my Litespeed Vortex. About 1000 miles ago, I began to experience occasional chain slip on the chainring and the chain riding above the teeth of the rear cassette. The slippage increased over time.
I had a new chain installed yesterday (2300miles). According to my wrench, the chainring and cassette are fine. The RD is not bent. The chain is new. Yet, I'm still experiencing chain slippage and above teeth action on the cassette. I've meticulously checked the frame and fork for cracks...nothing.
Two thoughts and a question come to mind...
1. I've shifted gears during heavy load (on inclines) a couple of times over the miles. I know this practice to be a no-no, so it doesn't happen often, yet I'm thinking maybe something is bent on the RD that my wrench can't see.
2. I took ill suddenly 4 years ago and I stored the bike without it's wheels on a repair stand, hanging by the seat post, with the front fork hanging below the chain stays so as to minimize stress points.
Now, I ordered my custom frame with one of those lugs located inside the right seat stay to secure the chain during shipping. I utilized that lug; meaning that the chain and RD were under whatever pressure that position created for a period of 2 years while I was off the bike.
Question...Is it possible that the tension spring in the RD is weakened because of whatever pressure the RD was under for the 2 years? I've tried adjusting the "B" tension screw on the RD which adjusts the vertical position of the RD in relation to the cassette, but it doesn't (didn't) help.
So I'm turning to you; fellow roadies who may have experienced the same problem. What was your solution?
Thanks for your replies.
I had a new chain installed yesterday (2300miles). According to my wrench, the chainring and cassette are fine. The RD is not bent. The chain is new. Yet, I'm still experiencing chain slippage and above teeth action on the cassette. I've meticulously checked the frame and fork for cracks...nothing.
Two thoughts and a question come to mind...
1. I've shifted gears during heavy load (on inclines) a couple of times over the miles. I know this practice to be a no-no, so it doesn't happen often, yet I'm thinking maybe something is bent on the RD that my wrench can't see.
2. I took ill suddenly 4 years ago and I stored the bike without it's wheels on a repair stand, hanging by the seat post, with the front fork hanging below the chain stays so as to minimize stress points.
Now, I ordered my custom frame with one of those lugs located inside the right seat stay to secure the chain during shipping. I utilized that lug; meaning that the chain and RD were under whatever pressure that position created for a period of 2 years while I was off the bike.
Question...Is it possible that the tension spring in the RD is weakened because of whatever pressure the RD was under for the 2 years? I've tried adjusting the "B" tension screw on the RD which adjusts the vertical position of the RD in relation to the cassette, but it doesn't (didn't) help.
So I'm turning to you; fellow roadies who may have experienced the same problem. What was your solution?
Thanks for your replies.