The Spur is a derailleur hanger extension that lets you use your existing rear mech to run wider gear ranges. The Spur allows riders to convert their road, gravel, cyclocross, or commuter drivetrain to a 1x system with a single chainring without giving up the gear range of a double. It’s also perfect for riders who simply want to run a bigger cassette to get lower gearing for those really big climbs. With the spur you can go up to a 40T cassette without having to buy a new rear derailleur and without compromising the shifting on the smaller cogs. Install the spur in less than five minutes at home. Compatibility 10s Cassette Compatibility: 11-32: Not Required (GS medium cage rear derailleur works) 11-34: Single (for double chainring be sure to not exceed the derailleur's capacity) 11-36: Single (for double chainring be sure to not exceed the derailleur's capacity) 11-40: Single (for double chainring be sure to not exceed the derailleur's capacity) 11-42: Not supported 11s Cassette Compatibility: 11-32: Not Required (GS medium cage rear derailleur works) 11-34: Single (for double chainring be sure to not exceed the derailleur's capacity) 11-36: Single (for double chainring be sure to not exceed the derailleur's capacity) 11-40: Single (for double chainring be sure to not exceed the derailleur's capacity) 11-42: Not supported 10-42: Not supported A few general points... Double chainrings are only supported with GS (medium cage) rear derailleurs. The Spur mounts only to standard derailleur hangers - direct mount frames are not supported. Triple chainrings are not supported.
