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Coming out of the saddle on a hill and pushing hard by rocking the bike side to side is normally a test for a mudguard stiffness but again silent.
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Basically they didn't wobble and buzz the tyres, also they didn't make any noise apart from a small 'donk' when a particularly large drop in the road was hit. I also really liked the matt black anodised finish, I thought that this looked really stealth and understated. It was really easy to adjust the stays to sit close enough to the tyre, but still with room to stop rubbing. Once fitted I was pleased with the stiffness of the setup, there was no wobble, and consequently no tyre rub.
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Portland Design Works Full Metal Fenders: the ride
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