I have changed gearing to 1:7 and have mounted 1:5 GRP onroad tires which results in a calculated top speed of 110km/h (69mph).
short video from today
As the GRP 1:5 tires provide enough grip i will stay with them for now. I'm happy with the actual speed so gearing should also remain as such. Time to buy some new batteries to bump up run time to 10 minutes plus. 2x 6s 5000 wired in parallel should be the ticket for this target.
Track width is to wide but still works using the mercedes body