The race groove is to keep the belt at top ratio without down shifting as fast for lower rpm cruising. I only wanted the pulley for more belt travel and also because the bearing was worn and very loose on my old pulley.
This weekend GOD willing we are going to the desert and will test the 13/43 gearing.
Top speed in my red buggy was 39/40 mph in a 100 yard straight away in dirt with 31/16 sprockets and 13/40 internal gears with some motor rpms to spare just couldn't pull any more.
The 39/16t and 13/40 gears same 100 yard test trail it topped 33mph at 8800rpms.
So with the new 13/43 I am hoping to get the 40mph at max rpms but have a better sweet spot while cruising and taking off. It already feels better on my short test runs.
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