MTB rear derailleur shifting problem

The stops within the grip shift are worn out. I did three of them
(Right, Left, Right) on a HUFFY KMART Powerline 21. The first
replacements pair cost 10 for one or 15 for pair and 5 shipping. For
the second replacement went to LBS and cheapest was 25 for one. Both
from same manufacturer, SRAM.

J.M. Rudder said:

Hi,

I have a mountain bike which shifts gear smoothly, but the rear derailleur
drops the chain back down to the small cog from all other cogs unless I keep
the shifter in place with my thumb, an obvious inconvenience. I can remove
it from its handlebar mount, but the mechanism itself appears to be
contained, un-dismantlable.

Josh
Ithaca, NY

Thanks, Mike.

Quoted message said:

From: Mike Schwab <[email hidden]>
Newsgroups: rec.bicycles.misc
Date: Sat, 07 Aug 2004 22:56:46 -0500
Subject: Re: MTB rear derailleur shifting problem

The stops within the grip shift are worn out. I did three of them
(Right, Left, Right) on a HUFFY KMART Powerline 21. The first
replacements pair cost 10 for one or 15 for pair and 5 shipping. For
the second replacement went to LBS and cheapest was 25 for one. Both
from same manufacturer, SRAM.

J.M. Rudder said:

Hi,

I have a mountain bike which shifts gear smoothly, but the rear derailleur
drops the chain back down to the small cog from all other cogs unless I keep
the shifter in place with my thumb, an obvious inconvenience. I can remove
it from its handlebar mount, but the mechanism itself appears to be
contained, un-dismantlable.

Josh
Ithaca, NY