The Cannondale Mtn 2 Mech Hanger is the Original Cannondale derailleur hanger for select Trail 24 kids bikes.   The first 3000 or so of the Kids 24 bikes used this unique derailleur hanger. Cannondale changed and standardized productionto use the KP284/ derailleur hanger. If your Trail 24 bike needs a derailleur hanger, measure the distance between the the hanger mounting holes. This KP316/ is 24mm. If it is larger then you will need the KP284 hanger. Cannondale Mtn 2 Mech Hanger Features Material: aluminium 6061 T651. Manufacturing:CNC machined, anodized finish. These hanger are much more durable and more esthetic than most of origin hangers. Our catalog number is: D600 Cannondale catalog number: KP316 Sold without screws Screw distance (axis/axis): 24mm Compatible with following models of CANNONDALE brand: