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These ATR wheels are 3.5" in diameter. They come as pair.��This item also includes a custom machine shaft with a welded hub on it to attach the wheel to the shaft.� The shaft also comes with a bearing that mounts into the large gear motor housing and the small gear motor housing.� Also included are two shaft collars for locking the wheel in place and onto the motor.� The shaft is made of Aluminum.

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Because these wheels are smaller in diameter, you robot will run slower, but have more power.� These wheels work great with all our gear motors.� With the our largest gearmotors, we think its a bit overkill on the power, but its up to you.� To calculate the speed of the robot just take the output RPM * wheel diameter (in inches) * 3.14 / 12 = feet per minute.

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The shaft is bored with a 6mm hole for mounting onto the gear motors.� If you order our large gear motor that has a 8mm shaft at the same time will will enlarge the hole to 8mm, or just e-mail us after placing the order and we can enlarge it for you.� Please allow a couple extra days for shipment when the shaft is modified.

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