> For the complete documentation index, see [llms.txt](https://docs.revrobotics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.revrobotics.com/ion-build/motion/wheels.md).

# Wheels

Most wheels used in FIRST Robotics Competition can be divided into four categories; Standard, Omni, Mecanum, and Compliant. One element to consider when choosing a wheel is the bore size, and if you will need any additional hubs to convert your wheel to the needed input or output. 

Most sizes of ION wheels feature a MAXSpline bore that can fit standard 1.125in OD bearings or easily be adapted to other bores using MAXHubs. Smaller wheels feature 1/2in hex bore. Larger sizes of ION Traction, Grip, and Omni Wheels have spokes with a bolt circle of #10 clearance holes patterned outward at 1/2in pitch. They also have a 3/8in-wide nut groove that eliminates the need for a wrench when utilizing the holes on the spokes.

## Wheel Basics 

REV Robotics offers three types of ION wheels: [ION Traction](/ion-build/motion/wheels/traction.md), [ION Omni](/ion-build/motion/wheels/omni.md) and [ION Compliant](/ion-build/motion/wheels/compliant.md). There are two types of ION Traction wheels available: the standard [ION Traction Wheel](https://www.revrobotics.com/ION-Traction-Wheels/) and the [ION Grip Wheel](https://www.revrobotics.com/ION-Grip-Wheels/).  The main focus of the traction wheels is to pull a robot (or create traction) in a forward/backwards motion. 

![](/files/8i4a5jSzIWx9jypFq6Rs)

{% hint style="info" %}
[ION Grip](https://www.revrobotics.com/ION-Grip-Wheels/) / [ION Traction](https://www.revrobotics.com/ION-Traction-Wheels/) / [ION Compliant ](https://www.revrobotics.com/ION-Compliant-Wheels/)wheels can easily be mounted flush when a build needs to gain load capacity or to increase traction as the cross section image above illustrates
{% endhint %}