Many single speed cogs will take a toll on freehub bodies over time. Their narrow nature paired with a whole lotta torque makes for trouble. Our friends in North Carolina developed a brilliant solution -- the Endless Bike Kick-Ass Cog. A full quarter inch wide (6.35mm) at the splines,... read more

The Shimano Deore XT CS-M770 Cassette takes all the ramping and weight-relieving of previous generations -- not like that stuff would go away -- and adds a cool new feature: pins on the backside of the tallest cog.

At first, the innovation seems like sloppiness or poor... read more

Proper chainline is essential to smooth single-speeding. That's precisely why the Endless Bike Fibonacci Spacer kit has been designed. Any chain line can be achieved within an accuracy of +/-1mm using the kit -- its clean look and complete functionality adheres to the single speed creed... read more

Cassettes aren’t sexy. Unless they’re XTR. We didn’t think there was much left to do with cogs, but then Shimano went out and re-designed this cassette, with reprofiled, stiffer titanium sprockets in the four largest cogs. This means they’re lighter and shift better and there’s less energy... read more

SRAM has borrowed some technology from Shimano to trick out this cassette. The six largest cogs (five largest on the 11-32) are pinned to a five-arm alloy spider that is machined out of a block of aluminum. To better showcase their product, SRAM anodized the spider and lock... read more

The SRAM PG-980 9-speed cassette is a kind of hybrid. The three largest steel cogs are riveted to an alloy spider for weight savings, stiffness and durability, while the remaining six steel cogs are individuals for economy. The three cogs take their spider from the ultra-high end... read more

The PG-970 employs the same PowerGlide II ramp system that is found on the PG-990. Instead of pinning the largest cogs to an alloy spider, all the cogs - save the 11 - are bolted to one another. This is the cogset SRAM derailleurs and chains are designed to work with, though the... read more

A freewheel is not a freewheel is not a freewheel. White Industries ENO freewheel is not some stamped and plated thing, but a CNC'd work of art. Chromoly steel teeth with a sealed cartridge bearing on the inside, seals outside, with 36 engagement points via a three-pawl mechanism,... read more

If you haven't tried single speed yet, know it is different than just using one cog "like, all the time." It is using one cog all the time. And it ain't easy. It often means powering up every hill and spinning out down every dip. That results in more fun than can be explained easily. The... read more

When you're totally committed to single speed, the conversion kit doesn't make any sense. A wheel build with a freewheel hub is the ticket. Shimano single-speed freewheels have been run on bikes since the early days of the BMX era. They work great?of course, there's very little that can... read more