Lone rider embarks on a frozen odyssey © Brudder/Getty Images

Iditarod, the most grueling single-bike race in the world, is back. The 350-kilometer cross-country mountain bike endurance race takes place in extreme low temperatures and with minimal supplies across Alaska's tundra.

Location: Alaska

Date: February 28th

Must-watch reason: Only those with superhuman willpower can complete this brutal event, as the harsh Alaskan winter environment is far from what ordinary people can handle.

Tomas Zejda riding at Crankworx Slopestyle in Rotorua, New Zealand on March 29th, 2015

Crankworx © Graeme Murray/Red Bull Content Pool

CranKworx Rotorua redefines the mountain bike slopestyle scene. A five-day festival featuring new formats and large-scale mountain biking culture awaits us.

Location: Rotorua, New Zealand

Date: March 9-13th

Must-watch reason: Witness the first springtime downhill competition at CranKworx Rotorua. Last year's winner Brett Rheeder set a new standard; will we see another rising star take center stage?

Loic Bruni competing at the 2015 Lourdes Downhill World Cup round in the famous French city of pilgrimage.

Loic Bruni © Lukas Pilz

UCI MTB World Cup returns to Lourdes for its iconic track. Loïc Bruni, last season's champion who won his title debut in France, aims to maintain his supremacy on the podium.

Location: Lourdes, France

Date: April 9-10th

Must-watch reason: Will Loïc Bruni continue his reign as champion? This young Frenchman has already made history by winning his first-ever World Championship title last season.

The men start the XCO World Cup in Nove Mesto.

Nove Mesto World Cup © Bartek Woliński/Red Bull Content Pool

UCI XCO MTB World Championship marks a historic change by separating XC and DH events for separate times and locations. The XC championship takes place between June-end July-starting dates in Czech Republic.

Location: Czech Republic (Nové Město)

Date: June-end-July-start (6月28日至7月3日)

Must-watch reason：As everyone focuses on Rio Olympics this year，this edition of UCI Mountain Bike Cross-Country & Marathon Championships may produce unexpected heroes among lesser-known riders like Mathias Fluckiger or Lukas Fluckiger who have an opportunity to win gold medals successfully home ground advantage could play a crucial role here.

X Games celebrates three years of hosting BMX Park Vert & Dirt events.

Coco Zurita performs at BMX Vert Finals at X Games Austin

Coco Zurita/X Games

Ringling Brothers Circus Elephant Ride

Daniel Sandoval wins BMX Park event during X Games Austin

环法自行车赛

Chris Froome enjoys victory after winning Stage 8 during Le Tour de France.

Trans-Siberian Extreme follows legendary Russian railway route.

Mikhail Ignatyev from Russia performs during Moscow-Kostroma stage of Red Bull Trans-Siberian Extreme

Brandon Semenuk tucks no-hander at Red Bull Joyride

Aaron Gwin puts practice into action on finals day of Val di Sole UCI Mountain Bike Downhill WC.

Szymon Godziek performs aerial stunt during Red Bull Rampage