Flex Wheels are made of a super tough custom blend of silicone rubber - different than any other flexible or compliant wheel currently used by FTC or FRC teams.
The 1-5/8" and 2” diameter wheels have a 9mm hex, which is meant to be stretched on to a 1/2" hex shaft. The 3” and larger wheels have a 1” bore, which can be stretched so they can be driven by a hex shaft, pulley, or plate sprocket. This also allows you to stretch these wheels over a roller tube to create a strong and lightweight roller.
