Geary was here today for the ISRA race, and brought by his prototype for his upcoming dual tire cutter.
Unique features are dual, heavy duty, large 1 1/2" diameter grinding wheels, vertical feed and stop screws, and an A/C motor (no power supply needed)
It's designed so you can easily cut to different diameters, using economical stop screw set-ups that the user makes up to preset sizes, from an Allen head machine screw and lock nut.
Not sure if it is the A/C motor, the 150% larger grinding wheel(s), or hitting the perfect ratio and rotation speed of tire and grinding wheel, but this unit works better than any portable tire grinder I've ever used.
I trimmed down a pair of untrued Koford soft wonder and it worked superbly, quickly cutting two of them at a time, with no belt slippage and without any perceivable taper or difference in diameter. Shown below are those two tires.
The unit is definitely bigger than a Hudy, but definitely smaller than a Hudy and a power supply.
Differences in the production unit will be the main base (only) will be made from Corian and some sort of piece will be on top to facilitate trimming the tire width.
It will be available to raceways through Chicagoland Raceway, at the normal Backtrack discount.
Retail is now $325-see post #43.
Please PM me if seriously interested, so Geary and I can gauge interest.