Box Three Prime 9 X-Wide Rear Derailleur

Good for Less Aggresive Riding

I bought the Box Three derailleur for a budget bike build. After three months of regular XC riding, the clutch came loose rendering the clutch useless and the shifting unusable until the derailleur cage was put back on. The cage screw had a lack of Loctite. Luckily, I discovered this before I hit the trail. I am a XC rider and after shifting under load and hard shifting in general, the limit screws got pushed out of a nylon insert holding the screws in. I contacted Box customer support and they resolved the issue quickly. Their customer service is excellent. I would recommend this for beginning or novice riders. For hard riding XC/trail/enduro guys, I recommend Box One/Two derailleurs.