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Butter b1 for quick release dropouts

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Product Description

Butter's b1 is the original and best chain keeper, and now it's even better. The new b1 Plus has an extended roller shaft that allows derailleur shifting which improves access to the derailleur for cleaning and service. The b1 is compatible with all quick-release style dropouts found on road bikes, cyclocross bikes and many older mountain bikes. 



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