05-02-2010, 02:47 PM
I keep buying bikes with 10-speed clusters... I must be a glutton for punishment . New bike (to me) exhibits frequent chain slipping in 4th gear only--i.e. small chainring in front, 4th biggest cog in back. I will check again today whether there is any "slipping" when I move the front onto the big ring. I don't think so. Bike has low miles, Dura Ace FD and RD, FSA SL/k double crankset. Shifts great. I may be able to see the chain riding on the tips of the teeth of the suspect rear cog when the slipping happens -- happens pretty quickly for my old eyes. Chain measures 12" spot on, as I noted bike has low mileage. Debug tips?