This is the chain guide that started it all,Literally. Sandwich style, the System 1 gets it done with a guide ring inboard and outboard of your chainring. It's super simple and extremely reliable. Frequently imitated, never duplicated, the original System 1 is still one of Steve Peat's favorites.

Forget the copies, the MRP roller is simply the smoothest, quietest, and most durable roller on the market. Its asymmetrical design allows for adjusting the chain entry and exit angles to toally perfect your ride

The MRP Slalom 1 is designed primarily for frames with elevated chainstays and non- ISCG model may require longer BB spindle.

Features :

• Single-chainring complete guide system
• Suits ring size 39-40t
• 104mm x 4 BCD only
• Available in BB shell mount (non-ISCG) or standard ISCG mounting pattern.
• weight : 430g