HardComp (27.5 X 8mm) 21mm wheels (front wheels)

Hard Comp: Ready for the front wheel

from extra-hard foam rubber with very little grip, wooden trains for the tires you can glue, nail polish or a similar seal to the friction resistance to get even closer to zero.

SC 2709P with 27.5 mm wheel diameter, tire width 8 mm, with an open rim flange inside diameter 20 mm, outside 21 mm, total width 12 mm rim.