new gary fisher, chain skip problem
 

I've had my new 2003 tassajara for 2 days now and on the 2nd day of riding the chain was skipping horribly. When ever I was pedalling with increased torque, the chain would jump gears and sometimes not catch at all, one time resulting in the pedal carving up my leg. Any insight into this? The bike shop guy took a quick look at it before he closed shop and said that the lines need to be tightened on a new bike after an initial break-in? Is this true? I hope its nothing serious or costly since I just bought the bike and if it can't take a rough ride then the bike is near useless for me.

-c

Cables always stretch when they are new. This puts the index gearing out of by a few mm. The cables need to be tightened using the small barrel adjusters, or taking up a bit of cable at the gear mechanisms.
You bike shop should do this for free.

thanks for the speedy reply. So the problem is probably nothing more than a tightening job? Thats great, here I was afraid I might have broken something with some heavy pedal crunching.

-c

Nothing out of the ordinary.

All new cables stretch. I usually try to stretch them by stressing them out a bit before they leave the shop, but invariably they will still stretch some more.

If you can't make it back to the shop, here's what you do:

Hang the bike from a rack or a place where you can pedal with one hand and make adjustments with the other.

Shift into the middle ring up front (left shifter) and the smallest cog in the back!

Start pedaling and shift up one click on shifter (in back - right shifter). If the chain doesn't shift into the 2nd cog, turn the barrel adjuster (located on rear derailleur, where cable meets the derailleur) counter clockwise until it wants to start climbing into the 3rd cog, then turn it back in (clockwise) about a full turn to a turn and a half. This will line up the rear derailleur directly under the cog. (When looking at the derailleur from the rear, the upper jockey pulley should line up directly below the cog.)

Then shift through all the cogs. They should be crisp shift going up and down. Do this a couple of times.

If the shifting is slow going up (to the bigger cogs) turn the barrel adjuster out at 1/8 intervals.

If the chain hesitates shifting down, turn in using 1/8 turns.

You'll get to a point where it shifts smoothly both up and down through all the gears.

If it shifts well in the small cogs, but not the big ones or versa-vice, you've probably bent your derailleur hanger and should take it into the shop for adjustments.

Good Luck
L8R:beer:

BTW congrats on the new bike!

thanks a2psyklnut,

this is pretty much my first serious mountain bike that wasnt handed down or a total POS. Im loving the front shocks and the disc brakes and am hoping to get many years out of it. One thing I was clear in looking for a bike that could take the beatings. So far Im loving it and I'd be biking everyday if my body wasnt so sore :rolleyes:

-c