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We had these hubs made to trim off a valuable 3.8mm (.15)
by making the setscrew hole on the aluminum rim underneath
the tire. It means you have to remove the tire from the hub
to tighten it but well worth it for designs that need every
millimeter of room! they come with a generously thick rubber
tire for maximum traction
Ideal for minisumo like our 1st place finishing Strong Bad!
The tire mounted on the hub measures in at 31.2mm (1.23in)
diameter and overall width of 13.2mm (0.52in) wide.
The hub is drilled for a 3mm axle ideal for the GM12a14a series
of gear motors! It's a nice fat beefy wheel ideal for small
robots! Secure it to your motor shaft with the included 440
hex grub/setscrew. Requires 0.050 hex wrench like our HexW050.
Although you can simply install the motor from the outside
we designed it so you could be mounted internally to the hub.
We've found that the internal cutout came back from manufacture
a wee bit thick but a bit of filing on the edges of the GM12a
lets it fit right in. By handfiling the edges down you can
finetune the installation so the brass edges of the gearbox act
as alignment bushing points that assist in keeping the wheel
spinning true. Or use a Sherline lathe to remove 0.010 from the
ID of the cutout!
Wheels each include a hub a tire and grub screw.
The entire wheel assembly weighs 12 grams.