Without knowing how far you're running at the moment its hard to say but less than 20% at a time and no more than once per week.
@Sainsburys_Ed 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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Without knowing how far you're running at the moment its hard to say but less than 20% at a time and no more than once per week.