The Speedline Killer Buzz Hub comes pre-loaded with a 7075 T-6 Aluminum Driver for the ultimate in lightweight performance, but sometimes you need the extra strength that the bigger riders are putting out.

If you know you have the extra horsepower, you know you need one of the Cro-mo drivers. The heat treated cro-mo driver maximizes the lock up and ensures a positive drive with only adding a few extra grams.

The Speedline Killer Buzz Cro-mo driver even comes pre-loaded with precision sealed bearings so it is the easiest swap you can imagine. Instant power transfer engagement.

Same spline pattern to accept Shimano® compatible cogs.