[FLY ARMY]

I recently had my LBS install a set of DA 7800 cranks on my complete DA 7700 drive train bike. I now have severe chain rub (front D) on 10 different gears. When I questioned the mechanic about it, he said that would happen until I upgraded to a 10 speed system. Am I being BS'd here or what?
If this is correct, can I use a DA 10 STI's and cranks with Ultegra front/rear derails, chain, and cassette? Do I need to upgrade the front D, or will the 9 speed work with 10?
Thanks

 

[TurboTurtle]

I recently had my LBS install a set of DA 7800 cranks on my complete DA 7700 drive train bike. I now have severe chain rub (front D) on 10 different gears. When I questioned the mechanic about it, he said that would happen until I upgraded to a 10 speed system. Am I being BS'd here or what?
If this is correct, can I use a DA 10 STI's and cranks with Ultegra front/rear derails, chain, and cassette? Do I need to upgrade the front D, or will the 9 speed work with 10?
Thanks

BS - TF

 

[steelbikerider]

9-speed deraillers work fine

I am running 10 speed cranks, levers and cassettes with 9-speed DA deraillers and everything work great. I did have to fiddle with the FD to get it to shift correctly but after initial adjustments, I can''t seem to find any reason to buy a new FD. Get a new machanic.

 

[the bull]

Yep, BS.

Get someone who knows how to adjust a front derailleur.