Bicycle Mechanics - shifting problem

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fadetoblack6902
08-17-06, 10:05 PM
I have an old zeus 10 speed road bike I am having a problem with. while shifting to and from the smallest cog, the chain hits and sometimes gets caught on the base of the seatstay at the dropout. The frame looks completly straight. The freewheel is in good condition. any ideas?
thanks in advance

moxfyre
08-17-06, 10:32 PM
Check the adjustment of the rear derailer: you can adjust the limit screws on the derailer to prevent the chain from moving so far out that it gets caught on the dropout.

Read this for how: http://www.sheldonbrown.com/derailer-adjustment.html#rear
the beef
08-17-06, 10:46 PM
Yep, limit screws. Just be glad it wasn't the other way around, with the chain slipping off the big cog into the spokes. That can often be messy. So make sure to adjust the low gear limit screw while you're at it.

fadetoblack6902
08-18-06, 06:04 AM
nope it's not the limit screws. The problem is when shifting from the smallest cog to the next smallest cog, or from the second smallest cog to the smallest cog. The limit screws are set correctly, and the chain does not go beyond the small cog.
redtires
08-18-06, 06:30 AM
nope it's not the limit screws. The problem is when shifting from the smallest cog to the next smallest cog, or from the second smallest cog to the smallest cog. The limit screws are set correctly, and the chain does not go beyond the small cog.

Uh, let me see if i'm reading this right. Your saying that when you shift either up or down in the last two cogs, the chain just jumps off the freewheel and into the dropout?
fadetoblack6902
08-18-06, 06:36 AM
well, you kind of are. It doesnt directly jump off the cogs. on it's way up to the second cog, the chain rubs on the dropout, and sometimes the chain gets caught between the dropout and the cogs, which makes a kink in the chain at the dropout. It doesnt actually fall off the cogs. Does that make sense yet?
Al1943
08-18-06, 08:06 AM
Do you have a tight link in the chain. Check each link to see if the chain plates pivot freely on the chain pins.

Al
AndrewP
08-18-06, 09:50 AM
you need a slightly thicker locknut or spacer on the drive side of the axle.
fadetoblack6902
08-18-06, 10:35 AM
you need a slightly thicker locknut or spacer on the drive side of the axle.


good thinking. I think that'll do it