Upper column is isolated from the lower column (plastic bush), lower column is isolated from the rack (rubber bushing) and finally the track-rods are isolated from the hubs (bushing) and are not themselves grounds.
@Dammit started
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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Upper column is isolated from the lower column (plastic bush), lower column is isolated from the rack (rubber bushing) and finally the track-rods are isolated from the hubs (bushing) and are not themselves grounds.