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Preven Chain Derailling

Old 06-10-05, 05:31 AM
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K. Alanc
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Preven Chain Derailling

Hi all
I'm quite new to chain mechanics etc. I want to buy an accessory to help prevent chain derailment. Very interested in N-Gear's Jump Stop. They come in 3 sizes 28.6mm, 31.8 and 34.9. Can anybody tell me what does this size refers to? What should I watch out for to know which size to go for?
Thanks
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Old 06-10-05, 06:23 AM
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shane45
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The sizes refer to your seat tube (outside) diameter as measured in millimeters. The Jump Stop mounts to your seat tube.

As to the effectiveness of the Jump Stop, I have no comment as I have never used one.
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Old 06-10-05, 07:56 AM
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troie
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By derailment you mean the chain falls off the chain ring or it shifts on its own either in the front or the rear?
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