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Ball Caster Metal - 3/8"
Price: $4.87
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Availability: Stocked
Sparkfun Item #: ROB-08909 -

"This ball caster kit from Pololu includes a black ABS housing, a 3/8" diameter metal ball, two spacers (1/16" and 1/8" thick), and two #2 screw sets. The total height of this ball caster is 0.4" with no spacers. You can also adjust the height by adding the spacers. The ball caster can be mounted to a chassis by the two screw sets included in the kit. The distance between the two screw holes is 0.53"."

Ball Caster Plastic - 3/8"
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Price: $5.03
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Availability: Back Order
Sparkfun Item #: ROB-08908 -

"This ball caster kit from Pololu includes a black ABS housing, a 3/8" diameter plastic ball, two spacers (1/16" and 1/8" thick), and two #2 screw sets. The total height of this ball caster is 0.4" with no spacers. You can also adjust the height by adding the spacers. The ball caster can be mounted to a chassis by the two screw sets included in the kit. The distance between the two screw holes is 0.53""

Rubber Ring - 4.65"ID x 1/8"W
Price: $1.76
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Availability: Out of Stock
Sparkfun Item #: ROB-12233 -

"These lipped Rubber Rings have an inner diameter of 4.65", a width of 1/8", and a sturdy rubber sidewall. These rings can be used as a replacement for Precision Disk Wheels or can wrap around the outside edge of another flat disc to make the ring a simple tire. Dimensions: ID - 4.65" Width - 1/8" "

Skate Wheel - 2.975 (Orange)
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Price: $4.17
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Availability: Back Order
Sparkfun Item #: ROB-12218 -

"These orange “skate” wheels have an outer diameter of 2.975”, an inner diameter of 0.87”, and a width of 0.94”. When used in conjunction with the skate wheel adapters (check below), you can use them with Actobotics motors and shafts, or use them with standard skate bearings. Dimensions: OD - 2.975” ID - 0.87” Width - 0.94” Documents: SketchUp Part Product Page (595620) " ...

Skate Wheel Adapter - Hub Connection
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Price: $9.65
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Availability: Back Order
Sparkfun Item #: ROB-12534 -

"These skate wheel adapters have a diameter of 1”, a width of 0.32”, and utilize the 0.77” hub pattern. These adapters allow you to attach the 2.975” or 4.90” skate wheels to almost any gear, pulley, or sprocket by connecting to any part utilizing the 0.77” hub pattern. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all...

Skate Wheel Adapter - Shaft Connection
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Price: $9.98
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Availability: Stocked-NoBackOrder
Sparkfun Item #: ROB-12329 -

"These skate wheel adaptors have a diameter of 1”, a width of 0.32”, and utilize the 0.77” hub pattern. These adaptors allow you to attach the 2.975” or 4.90” skate wheels to ¼” drive shafts. Actobotics is a robotics building system based around extruded aluminum channels, gears, precision shafts, and ball bearings. Thanks to the two standardized hole patterns, nearly all Actobotics components can be intuitively connected together. The wide range of...

Tank Treads
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Price: $16.02
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Availability: Back Order
Sparkfun Item #: ROB-00321 -

"Track set for tank treads. Use these treads to create your own tank setup. These work superbly with the Tamiya dual gear box. Comes with: 2 Tracks x 30 Links 2 Tracks x 10 Links 2 Tracks x 8 Links 2 Large Drive Sprockets 2 Large Idler Wheels 6 Large Road Wheels 10 Small Road Wheels Various Drive and Slip Shafts Various Screws and Hardware "

Wheel 32x7mm
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Price: $11.19
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Availability: Back Order
Sparkfun Item #: ROB-08901 -

"This custom-designed plastic wheel from Pololu has a silicone tire measuring 1.26" (32 mm) in diameter and is designed to fit the output shafts on our micro and mini metal gearmotors as well as the Solarbotics metal gear motors. Both the Micro Metal Gearmotor Bracket and Extended Micro Metal Gearmotor Bracket will work with this wheel. Sold as two wheels."

Wheel 42x19mm
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Price: $11.19
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Availability: Back Order
Sparkfun Item #: ROB-08899 -

"This custom-designed plastic wheel from Pololu has a rubber tire measuring 1.65" (42 mm) in diameter and is designed to fit the output shafts on our micro and mini metal gearmotors as well as the Solarbotics metal gear motors. Teeth on the hub optionally allow a reflectance sensor to be used for encoder feedback. This rugged wheel is designed to fit securely on the output shafts of the micro and mini metal geramotors. These gearmotors should be mounted onto the side of the hub with the...