bosbike

Hello,

I was hoping someone could enlighten me on an issue I am having with my Dura Ace 7800 derailleur:

Recently I switched from Ultegra SL triple to Dura Ace 7800. It is a complete DA setup (except brakes) including chain, cassette and crankset.

My issue is with the rear dérailleur shifting. Although the rear derailleur is aligned (no mis-shifts or skipping gears or anything like that), and my down shifts to larger sprockets (i.e. from from 11t to 13t) are smooth a silent, my upshifts to smaller sprockets (i.e. from 13t to 11t) are not smooth nor quiet.

Every up shift, I experience two things: I sharp change in the gear (i.e. if I kept force on the pedal my leg would jerk at the change of gear) and a relatively loud slam of the chain to the proper gear.

Any input as to what is causing this is greatly appreciated!

Thanks!

-Franco