Or, don't buy anything - just look in your recycling bin, find an old plastic bottle, cut 'mudflap' out with scissors and attach as suggested in the second post above.
Plastic flower pot also works for this.
I’ve used cheap, flexible cutting boards of various colors and textures to make flaps. Works great and you can get several flaps from each one.
@farewell 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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Or, don't buy anything - just look in your recycling bin, find an old plastic bottle, cut 'mudflap' out with scissors and attach as suggested in the second post above.