I've got a 5-1/2 year old OCR2 with Tiagra FD, triple gear set.
When I shift from the middle ring to the big ring, the chain doesn't always stay there; it will simply drop back down. Doesn't matter whether I hold the shifter for long or short. Happpens about 40% of the time.
The shifters are pretty new Ultegras. I've had the bike to the LBS a few times for adjustments yet the problem persists.
So I'm wondering if the problem could be with the FD rather than the cabling? Is there any shelf life to a FD?
Any other suggestions welcomed!