You are reading a single comment by @novocaine and its replies.
Click here to read the full conversation.
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
@novocaine
no it's got nothing to do with dirt.
to remove the rubber takes friction. this friction creates heat which burns the rubber as it's removed. the rubber becomes black when burned leaving black marks.
using another rubber object to remove the makes is ti do with less heat generated as it takes less effort to remove the mark than it does to make it.