I have a 2012 Specialized Roubaix with Ultegra components. Since the day I got it, there are a couple gears towards the center of the cassette where I'll almost always miss a down shift. Then, when I click again, it shifts twice. Annoys the heck out of me. No problems up shifting.

I took it to my LBS last week for it's allowed physical during the first year of ownership, and immediately the tech said the cable was too short to the rear derailleur. Now that didn't sit well with me since it was built that way, and once he realized it was passed through the inside of the frame on the Roubaix, he determined he couldn't lengthen it, and I would have to bring it back this week for the more experienced guys to look at. He also added tension to the cable since they may have stretched over its' breakin period (which doesn't surprise me), but that hasn't helped. I have 3 sets of wheels..all with 11-28 cassettes..and all of them do the exact same thing.

Do you think he may be onto something with the cable being too short ? Said it restricts the cable movement. In fact, he said the pass through frame style is a headache compared to older out of frame cabling. Didn't sit well with me either since I have about 4K in that bike thinking it was an upgrade over my 105 model that I have NEVER had problems with.

But, anyway, I'm taking it back tomorrow to see what the more experienced guys say. If the cable has to be lengthened, it appears it has to be replaced from the front through the frame all the way to the rear derailleur. Last weeks tech hadn't done that before and couldn't pull any slack through just trying to lengthen the short rear piece of cable.