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Rear Cog Protective Plate

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brb408wpb Offline
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Posts: 6
Joined: Jul 2009
Post: #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
Jul 18, 2009 10:02 AM
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cyclerUK Offline
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Posts: 327
Joined: Jan 2009
Post: #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.
Jul 18, 2009 12:34 PM
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brb408wpb Offline
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Posts: 6
Joined: Jul 2009
Post: #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.
Jul 18, 2009 06:43 PM
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