Measure what? If you mean which width to get, buy the guards that are around 5mm wider than your tyres. So If you ride 28 tyres, get the guards that are around 35mm wide.
Buy SKS Chromoplastic mudguards.
@Skülly 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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Measure what? If you mean which width to get, buy the guards that are around 5mm wider than your tyres. So If you ride 28 tyres, get the guards that are around 35mm wide.
Buy SKS Chromoplastic mudguards.