Marble? inside a HD tube

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Crossed-up

Pangaman
Joined
Jun 30, 2008
Messages
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Location
Cape Town
Bike
Yamaha XT500
I have a Bridgestone UH tube in the front of my XT.  As I spin the wheel I can hear something rolling around inside the tube. I checked it out it today when I changed my front tyre.  It feels like a regular marble, perhaps a bit smaller.

It's a bit disconcerting, but I suppose at speed it will settle somewhere.  Is this a freak of manufacture or is a feature of these tubes - some sort of self balancing thing?
 

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