The new tires are nice!  I have assembled and highly modified four Radmini Bikes so far and I can tell you there is an improvement in the handling.  The difference is the width of the new tire (late 2020) has been reduced to 3".  This is compared to the early 2020 model that uses a 3.25" tire.  The low speed maneuvering is more predictable. the bike tracks better and can switch back and forth from left and right turns better.  When I wear out my 3.25" tires I will be replacing them with 3" wide tires.  Keep in mind the wider the tire, the harder it is to lean the bike over in a turn use both wheels to turn.  This isn't the first time the tire width has been reduced.  The 2018 Radmini tire was 4" wide.  I never rode one with that width so I can't say how those tires work.  I can say with experience the wider tire on my motorcycle makes it more difficult to turn.  Think of placing a ice cream sugar cone on a table and give it a push.  BTW I have installed 35 amp controllers and color displays on both the Radmini and the Radrover models.  The smaller wheel bike accelerates and stops better.  Yeah the wheels are smaller but a real biker wouldn't complain about it.  There is a difference between the comfort, the Radrover has the rider in the attack position and the Radmini has a much more relaxed position. I guess that's why the Mini was selected 4:1 over the Rover.