I bought my DT's at the local GY shop - nothing special.
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As stated above the E rated duratrac has a slight hum on the road but it's no where near annoying.
When I bought them I had pretty modest expectations but have been shocked at how well they preform in a variety of traction conditions.
Outstanding! I plan to bump up in tire size soon, and cheaper is always better. I'll see how the MT/R's wear, as so far I'm very happy with them. But, the Duratracs are a great second option.