# 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](https://docs.revrobotics.com/ion-build/motion/wheels/traction), [ION Omni](https://docs.revrobotics.com/ion-build/motion/wheels/omni) and [ION Compliant](https://docs.revrobotics.com/ion-build/motion/wheels/compliant). 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. ![](https://2800450911-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F4vnkeyE3Rv32OmveFas2%2Fuploads%2F6p9PW6GM6A5oN4t1FrAh%2Fcut%20away%20wheel.png?alt=media\&token=ae2de399-8351-4fab-b5c0-dd331614db73) {% 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 %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.revrobotics.com/ion-build/motion/wheels.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.