Occasionally, a brand develops a simple idea with the potential to have wide-ranging effects on the market, and the Zwift Cog could be one of those. In its purest terms, the Zwift Cog is just a ...

This sprocket (cogs mesh with other cogs) bolts to the ISO (six bolt) disc mounts on a mountain bike hub in place of the brake rotor. With a 135mm wide frame/wheel, you can then flip the wheel to get a ...

I'm not writing this post only because the company involved has the awesome name of Schlumpf, but it certainly played a big part. The gadget in question is a new kind of belt-drive for bikes, the ...