1. GHP 2014 Avery Andrews Archish Chaturvedi Nandan Dave

2.  The concept of the hubless wheel (A.K.A. centreless wheel) is a wheel with no center.  The hubless wheel was invented by Franco Sbarro. Franco Sbarro Hubless Bike

3. Motorcycles Ferris Wheels Rovers

4.  12.5 mm thick ABS plastic  23.6 mm diameter motor slot to fit a 24.2 mm motor (tight slot keeps motor in place)  Adjustable clamp with 3 mm slack

5.  98 mm inner diameter  136 mm outer diameter  1:11 torque ratio  Six 4 mm screw holes for 3/32 screws

6.  98 mm length  50 mm wide  Eight 4 mm screw holes for 3/32 screws  36 mm distance between each set of four screw holes for the two motor mounts

7.  86 mm inner diameter  98 mm outer diameter  Six 4 mm screw holes for 3/32 screws