Chicago-based nonprofit World Bicycle Relief (WBR ... it's reworked the simple concept of a chain, gears and pedals into a rarely-seen unicorn: a two-chain drivetrain. The first thing that ...

The type of mountain bike chain to buy depends on the type of bike ... which means they use just one chainring at the front (as opposed to two or three that used to be common), and a wide range ...

With components designed by cycling industry giant SRAM and made from heavy steel, the bike has rim brakes, two gears, two chainrings, and two separate chains. And that makes total sense.