Yes, moped 2.5" Pirelli's are cool.
Seems a cautious approach to approving safer non-bicycle tires has caused uncertainty. There is a tight rope act to somewhat keep these events motored "bicycle" while still allowing those pushing the envelope of innovation a proving ground.
Safe tires are encouraged, especially for the 35mph+ bikes. The Maxxis hookworms seem to have proven themselves, (correct me if you have seen otherwise) as well as moped/(motorcycle) tires that are designed for our racing speeds. Lo-powered bikes should strive to run bicycle tires to be within the spirit of MBR (I've never noticed the tire Police). Hi-powered bikes should strive to run bicycle wheels and safe Maxxis, or Pirelli 2.5" wide tires, this list should grow. If you have 2.75", 3.00", or motorcycle wheels; please contact MotorBicycleRacing to discuss. He's easy going and an advocate of our sport.
Think I'll put up a special prize, a Turnigy 63/74
motor for the fastest <1500W finisher in the new blended small motors class
Safe, you and Christofe#74 yellow fairing, who runs a delightfully designed 49cc 2stroke, should have a lot to discuss.
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3 hardtail MTBs:
-48V Lith-ion 10.5amp hr-408 C-lyte
-run Century rides w/Q100 mini
-20" wife's BaFang,
-20" TurnigyMax50cc airline suitcase folder,
-24" Stewart/Hass 9C; 3.5K/40mph fun racer