That will happen to every bike, if you don't know how to ride it. Try not to shift while under full pressure.
stanomatic said:In January I bought a 04 Stumpjumper FSR Expert Disc bike. This was a major improvement over my 10 year old K-mart special. At least I used to think that was an improvement. From day one I have dropped the chain on to my BB. I had my LBS adjust it only to have it drop right after the adjustment. I have had three different shops look at the problem.
Most of the time it is when I am riding the mountain. After six months of riding the bike and walking on eggshells trying not to hard shift and drop the chain I took it to the pros of CO Sports Garage. They said the drive train is not aligned and sold me an adjustable BB and Truvativ cranks. They adjusted the BB to pull the crank all the way to the frame. Later I took it out on the mountain and the chain dropped yet again.
I am a runner transitioning to mtn bike racing. I race short track and 15 ? 25 mile mountain bike races. If I can eliminate jamming my chain I can move up the ladder a few notches as the time shows only seconds between riders. I am spending about a minute or so un-jamming the chain every race.
My question is: Is the chain drop a problem with Specialized bikes or with most FSR bikes? I am considering selling my bike for one that will keep the chain on the drive. Is there an aftermarket product I can purchase to keep the chain on the small ring instead of my frame?
round00 said:I have a 04 Stumpjumper and my chain sucks all every once in a while. It'll fall off, but it should not be doing it all the time - mine does it every 8-10 rides.
I'd say something isn't right...
You should take it back to where you bought it and tell them to fix it. Did you get free service as part of the purchase?
I'd also think about contacting Specialized - on the phone and discuss the problem with them...
stanomatic said:I am putting on the original parts back on for warranty reasons and some one from Specialized will be contacting me in the next couple of days to hopefully resolve the issue. I will post again after this has been resolve or not resolved. Thanks again MTBR community.
Great to hear! No reason to spend that much money and have something that doesn't do what it is supposed to do...stanomatic said:Bottom line - 6 mechanics, 3 shops, and four cranks later, I now have a great working bike.
I've noticed the same thing on EVERY bike I've bought. Road,Mtn, Trek,Giant,Specialized they all had it too high for me. The thickness of a nickle (for us yanks) is about right as it passes over the big ring while shifting. I watched a couple of guys in our lbs building up bikes. The derailleur comes at that height and they just leave it there so it ends up being too high.Maestro said:Good News!
I have found many bikes to have the front derailleur mounted too high on the seat tube relative to the chainrings. I thinks S h i m a n o only recomends 1.5mm clearance. Lowering it helped my bike when I was dropping chains.