You are reading a single comment by @Dammit 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.
@Dammit
Are you using a GSC-10 Tiswas? If so how is it calibrated?
I'd tend to trust the GPS as MDCC suggests, but that's not to say that it cannot be giving erroneous results.