The Hope Technology RX Spiderless Retainer Ring is designed specifically for their RX road and gravel cranks and uses a narrow/wide design to grip onto the chain and stop it from dismounting when riding over harsh and uneven terrain, means you can ditch your chain guide for this simple and clean looking system.Designed specifically for Hope RX ChainsetsHighly durable CNC Machined 7075-T6 aluminium constructionCompatible with 9spd, 10spd, 11spd and most 12spd chainsStylish and hard wearing anodised finishIt mounts directly to the crank's axle and does away with the need of a spider which means you save a whole heap of weight. The Retainer Ring is designed to work with 9, 10, 11 and 12 speed set-ups and it provides a quieter drivetrain with less drag. The ring is constructed of CNC machined 7075-T6 aluminium providing the perfect blend of light weight and strength whilst the hard anodised finish makes it ultra durable.