I dunno. You get better traction when your bike is more upright. Safer thing to do is use body position to turn first, lean angle next as you need it. If you are using the right technique and turning with maximum tire contact, it should be pretty hard to ride all the way to the edges of your tires on the street. You just don't get the speed unless you ride like an idiot. On the track, sure, ride the whole tire, but I just don't see the opportunity on the street. Just my
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"Improvement makes straight roads, but the crooked roads without improvement, are roads of genius." — William Blake