I just recieved the Dura Ace 9 speed bar end shifters I bought for my TT bike build. They are the B77 model. I have a brand new, never used Ultegra 6500 rear deraillier. But when scanning through the paperwork that Shimano provides with the bar end shifters, it says they can only be used with Dura Ace 7700 rear derailliers. ??? What gives here? I've used Ultegra RD's with Dura Ace STI brifters...any idea why they say this for the bar end shifters? Do I need to go out and spend more money on a Dura Ace rear derailllier now?
Frustrated and confused.