Last April I bought a Trek 2.1 WSD™ (specs below). I'm repeatedly having to have my shift cable adjusted at my LBS as I keep losing my big ring - the chain just won't stay there after shifting. While I know that I should learn to fix this myself, is this really normal? Has anyone had this problem and can shed some light on why this keeps happening? Is it something specific to my components, my bike, or something I might be doing to cause this?
Long version of problem: Within a few rides after buying my bike I was back in the bike shop because it was taking 2 clicks to shift into the front big ring - not a big deal, but wasn't sure this was normal. My LBS adjusted a cable & everything was fine - for a few rides. It was soon taking 2 clicks to shift again & I decided not to worry about it, it wasn't a big deal. Then, I totally lost the big ring - the chain just wouldn't stay there after shifting. Back to LBS for adjustment. It shifted on 1 click for a few rides, then 2 clicks, then, in my first tri, again lost the big ring. bummer. This has happened repeatedly, most recently in a tri this past weekend. (note: I wasn't shifting under load; it was on a flat/downhill.) I'll be making yet another trip to my LBS today to get the cable adjusted (and really paying attention so I can do this at home) but it doesn't seem to me like you should have to adjust your cables every few rides - or do you?
confession: I'm a horrible cross-chainer - love my top & bottom gears - but I thought this would potentially stretch your chain, not the shift cables. Could this be contributing?
Thanks for any help/suggestions -
Shifters Shimano 105 STI, 10 speed
Front Derailleur Shimano 105
Rear Derailleur Shimano 105
Crank Shimano R-600 50/34 or R-553 50/39/30
Cassette Shimano 105 12-27, 10 speed
Headset Aheadset w/cartridge bearings, integrated, sealed, alloy
Brakeset Shimano Tiagra w/short reach Shimano 105 STI levers