USPKS announced earlier this year that they and Route 66 are going to the 7.10 for juniors in 2015. The 6.0 tire is made really for the US market, and there doesn’t seem to be a real reason to keep it around. Just more of a pain for shops and karters to have more rims and tires in stock.
I don’t know anything about the WKA rumor, but if the trend continues as it has, they will follow USPKS.
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