different attachment method. These wheels are designed
to be used directly on a keyed half inch shaft.
If you want a durable wheel that can be run directly
off of a gearbox, it's a very good option. The size and
weight make it an option mainly for the 30 lb class,
however, it would be possible to use it on a
12 lb robot.
FingerTech Sumo Wheel
Diameter:
1. 75-3 inches
Tread Width:
1.5 inches
Weight:
61 g-178 g
Cost: $15.70-
$31.32
Comments:
As the name
suggests,
these wheels are primarily meant for Sumo competitions.
They're available in two durometers (20A and 45A) and
multiple bore options ( 3 mm-1/2 inch), and can have a
keyway cut in them at larger bores. The smallest class
these could be practically used for is the 3 lb class,
however, they have been used in the 30 lb class in
the past.
If you intend to use these for combat, a plastic insert
could be added to the open side of the wheel to help
dissipate the forces from any impacts the wheel sees to
the shaft in a way that will reduce the chances of
bending. While the 20A wheel option would provide
fanastic grip, if you do choose to use these the 45A
option will likely be much more cost-effective in
the long run.
FingerTech
Mini Sumo
Wheel
Diameter:
1.125 inches
Tread Width:
0.85 inches
Weight: 12. 6 g
Cost: $18.48-
$20.48 (pair)
Comments: The Finger Tech mini Sumo wheel was
originally designed for their Mini Sumo kit; however, the
high grip tread and lightweight construction make it an
attractive option for 150 g- 3 lb robots. If you're using the
wheel on one of their Spark gearmotors or any other
gearmotor of the same or smaller diameter, you have the
option of having the wheel extend over a portion of the
gearmotor. If the gearmotor is robust enough, this can
allow you to build a much more compact drive system
without sacrificing too much durability. However, this will
likely block off the gearbox mounting points
and may require creative mounting solutions.
Lite Flite/Lectra Lite With Lite Hub
Diameter:
1. 5-5 inches
Tread Width:
0.445-1.5
inches
Weight: 1.2 g
(hub only)
Cost: $4.62
(pair, hubs
only)
Comments: This combination is one of (if not) the
lightest wheel option for the 150 g- 3 lb classes. With
this arrangement, you take a stock Lite Flite or Lectra
Lite wheel (except for the 1.5" Lite Flite, which needs to
be bored to 5/32" from 1/8") and insert the hub,
applying glue as it slides on. If the wheel is mounted
externally, placing the hub on the outside will reduce
the chances of the wheel being ripped off of the hub.
However, this puts the shaft in greater danger of
damage. The only downside with this hub solution is
that you can't re-use it when the wheel is either worn or
damaged beyond use. So, if your bot is prone to wheel
damage, you'll want to keep a stash of spares
available.
Lite Flite/Lectra Lite With Snap Hub
Diameter:
1. 5-5 inches
Tread Width:
0.445-1.5 inches
Weight: 6 g- 7 g
(hub only)
Cost: $14.78
(pair, hubs only)
Comments:
The Finger Tech
Snap hub is their
more robust
SERVO 12.2013 29
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