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is that material quite stiff like an ass-saver?
like most sheet materials, their stiffness can be modified by the addition of shaping into the equation. I put the mud flap inside the mudguard and set it so that it follows the contours thus making it stiff enough to acheive what you are looking for.
You can shape it using hot/boiling water. It retains its profile when cool.
The mud flap follows the profile of the mudguard and gradually opens out to the wider end.
Not at home so cannot add a photo or two
Raw were cheaper than I remember but bike is no frills or expense spent so I'm looking for something even cheaper!
I've used rubber offcuts from a local gasket factory previously but even when quite thick it's been too flexible at speed for riders behind, is that material quite stiff like an ass-saver?