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@MileEater
I believe it has to do with the ridges getting caught in between tiles. The rail hooks into them, making it steer unpredictably. My older tires would just ride through the ridges (I'm not sure if that's how you call them).They feel normal when riding on smooth roads though, very little if no flex, even for a slightly taller tire. But a spongy feel is to be expected with 3mm belt, but nothing you can't get used to.