The Tamiya 70121 Pulley Unit Set is an interesting member of the gearbox line since it doesn't use any gears! Instead it features seven belt driven pulleys of various sizes that can be configured in many different ways. Another cool thing about this kit is that it comes with both single and double bushings so it's compatible with both round and hex output shafts of both 3mm and 2mm diameters. With these double bushings, you can connect the pulleys side by side on the same shaft or screw. A motor, belt guide, power bands, rivets, screws and nuts are also included.
In the box:
One 50 mm-diameter pulley
One 30 mm-diameter pulley
One 25 mm-diameter pulley
One 20 mm-diameter pulley
Three 11 mm-diameter pulleys
Two single and two double 2 mm hexagonal bushings
Two single and two double 3 mm hexagonal bushings
Two single and two double 3.1 mm round bushings (allow pulleys to idle on 3 mm hexagonal and round shafts)
Two single and two double 2.9 mm round bushings (allow pulleys to rotate with 3 mm round shafts)
Two single and four double 2.1 mm round bushings (allow pulleys to idle on 2 mm round shafts)
Four single and two double 1.9 mm round bushings (allow pulleys to rotate with 2 mm round shafts)
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