The One Seven Chainring is the Signature ring of Olympian Luke Madill. Designed and made in Australia from 6061-T6 aluminium. Precision CNC machined with Michram Industries own tooth design for best wear and smoothest feel on chain rotation. Then high polished before anodizing in a range of colors. We also offer a custom range which allows the rider to have their name and number engraved onto the ring as well for that extra bit of customization.