The K1 was like 3 gear transmission and that had its issues. I think one of the issues is the size of the diffs and with the K1 series the size of the spur. When you look at the other belt drive cars that have appeared in the last couple of years none have gone well on high traction circuits, good on dirt though! The X Rays and B64 cars just seem a lot easier to drive and can be pushed harder easier.
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