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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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@hippy
http://www.mavic.com/en/technology/wheels/Exalith
Mavic exclusive technology for Wheel-Tyre System featuring aluminum rims provides a very high level of durability and a unique aesthetic. The Exalith specific treatment penetrates the alloy, so the rim keeps its distinctive anthracite grey color for thousands of kilometers. - Delays rim wear - Specific formulation penetrates into the rim to provide extreme hardness - To be used with special Mavic Exalith brake pads to ensure braking performance and longevity (delivered with the wheels)