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Rear Cog Protective Plate
#1
In cleaning my rather old bike yesterday, I noticed the plastic plate (does it have a name?) was brittle and cracking. To replace it, I believe I need to remove the cogs, pop off the old, and pop on the new. Has anyone done this? Are they one size fits all for your rim size?
Thanks
Bruce

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#2
The disc is there to stop the rear derailleur going into the spokes and damaging them.
You actually don't need to have one unless there is a danger of the derailleur overshifting.
There is usually a stop screw, on the derailleur, to counteract this.
If you look at current bikes they don't have the disc.
I would expect all discs to be standard and possibly you could make your own out of suitable plastic.

[font=Trebuchet MS]Ride hard or ride home alone![/font]
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#3
Thanks. I was at the bike shop today and got a similar answer. They say some people actually break them off and never use them.

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