Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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Easy way to know without arrows. The logic of the directional tread is that the center hits first, then pushes water outward in the channels as they come into contact with the pavement until it leaves out the side. That's very important for flat bottomed car tires that otherwise would plane up on the water film (hydroplaning) like a racing boat.
In reality it doesn't matter on bike tires, because the small contact patch, and curved profile acts like a wedge, cutting through water and pushing it out sideways, regardless of tread direction or even if there's any tread at all.
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