Two Twist bicycles can be connected to form a tandem bike. The rear wheel has attachments for two pairs of pedals and is easily removable, while the seat and handlebars can switch places.

Watch in awe as Australian street trial rider Andrew Dickey shows off his jumping and balancing skills, planting his black bike’s tires on the most precarious of surfaces.

In a quest for common decency, Casey Neistat conducts a social experiment by stealing bicycles in broad daylight in the middle of New York City in the hopes that somebody will give a damn.

Biker Alejandro Paz takes us on a thrilling ride down the side of a Peruvian mountain, combining death-defying speed with a path strewn more than its share of rocks, bumps and obstacles.

Christophe Robillard’s bold, minimalist bicycle design has a striking matte black frame, offset by skinny whitewall tires and a brown leather seat. No word on if or when it’ll go into production though.

Using magnetic eddy currents between itself and a metal wheel rim, this bike gadget produces light without batteries, and without touching the wheel at all. Available in headlight and brake light models.

Sure, we’ve witnessed plenty of awesome bike stunts, but they’re always using proper street trial bikes. Here, rider Mickael Dupont proves that skills always trump equipment.

Director Guillaume Blanchet’s ode to biking and to bikers, especially his dad. A highly enjoyable visual metaphor about passion and dedication. But don’t try this at home. Or on the road.

Just 36in long, and 120 pounds, this urban electric bike fits anywhere. The BOXX is a marvel of modern engineering, with drive-by-wire, all-wheel-drive, traction control, ABS and LED lighting.

Designed by Patrick Jouffret of French studio Agence 360, the Overade is a concept bike helmet that folds in half. Its portability is meant to encourage cyclists to carry (and wear) helmets.

It’s not like we haven’t seen bikes that fold up to save space before. But Dominic Hargreaves’ prototype folding bike collapses down to the diameter of the wheel itself.

These mountain bikers take a ride on a narrow path alongside cliffs which looks insanely dangerous. It’s so tight, we’re amazed that the handlebars fit alongside the rock formations.

Impressive engineering (or sorcery) from this Russian has led to one of the coolest bikes we have ever seen. Its tall-bike to chopper transformation could guarantee this never happens again.

There’s lots of tight turning, fun camera angles and cool tricks in this motorbike drift video from professional stunt rider Jorian Ponomareff, who makes it all look so easy. (Thanks Flex!)

Katy Beveridge wanted to know if it was possible to create a zoetrope-style animation effect and capture it on a rotating bicycle wheel as the bike is in motion. The answer: a resounding yes.

A year’s worth of gorgeous custom motorcycles, without the tacky pinup girls, courtesy of BikeEXIF. The perfect calendar for fanatics who appreciate bikes, and just want to cut to the chase.

Normally, a motorcycle accident is a bad thing, but much like the Benny Hill song before it, the theme music from Super Mario Bros. can turn a tragedy into a lighthearted romp.

Volta Motorbikes are designed for city commutes. They have a range of 44mi and a top speed of 75mph. The 35hp engine is powered by batteries that can be fully charged in 2hrs for a mere $0.60.

A silly video documenting made-up deviations from the simplest of bike moves – the no hands. The Def Leppard drummer bit is just so wrong. Directed by Ninian Doff, with music by Martin Brooks.

Kuat Racks’ Bottle Lock has a 5-foot-long braided steel cable coiled within itself and a small lockable compartment on the bottom; it fits into most standard holders on a bike. Available 11/1/2011.

Mountain biker Evan van der Spuy takes a ride through the wilds of South Africa, when out of nowhere pops a Red Hartebeest, ramming into him at top speed. (Thanks, Everyone!)

A group of guys in Moscow decide to take a motorcycle ride, and play a little concert while they head down the highway. We’d feel better if they were wearing helmets, though.

Watch and learn every possible way not to sit on a bike as rider Rafal Pasierbek teaches his motorcycle a thing or two during the freestyle event at Poland’s 2011 Stunt GP competition.