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Old 03-25-08, 09:00 PM   #1
turtletwins2002
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Rear tension pulley

Pedals locked up at mile 10 of a 12 mile ride, hopped off and found this jammed into the tension pulley of my 105 RD. It appears to be made of soft, pliable rubber (consistency of an automotive oil filter seal) and is molded in the shape you see, does not appear to be broken. I just want to make sure its not part of my bike, which after an inspection and test ride, it does not appear to be. However, I cannot imagine where or how this thing found its way onto the chain and into the tension pulley. Anyone have any idea what it is or where it may have come from. Kind of a noob when it comes to road bikes, so maybe its common to have random rubber parts jam themselves into the drive train? I was on a well traveled road at the time so it could be an automotive part, I suppose. It has this part number molded into it: 70 0195/2

Any help would be appreciated,
BaJ

The pen cap is included for scale:

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Old 03-25-08, 09:21 PM   #2
JiveTurkey
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Doesn't look familiar. Likely just something that got kicked up from the tire.
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Old 03-25-08, 09:23 PM   #3
skiracing
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This kinda makes me think of the O-ring that brought down the shuttle!
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Old 03-25-08, 09:49 PM   #4
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Originally Posted by skiracing View Post
This kinda makes me think of the O-ring that brought down the shuttle!
Except the that ones on the space shuttle are about 20' in diameter.

- Mark
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Old 03-26-08, 07:12 AM   #5
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Road side debris isn't a common problem but it does cause damage once in a while. A few years ago I destroyed a nearly new 9-speed Ultegra rear derailleur when a piece of steel wire (coat-hanger stuff) along the road side got caught in the chain and sucked into the derailleur.

Last edited by HillRider; 03-27-08 at 11:05 AM.
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Old 03-26-08, 09:11 PM   #6
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Thanx for the help. All seems fine with the bike after todays ride. Must have been junk, lucky it was rubber.

BaJ
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