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

Iditarod, the most grueling single-rider endurance test in the world, is a 350-kilometer mountainous marathon that pushes riders to their limits in extreme cold and minimal supply conditions across the Alaskan tundra.

Location: Alaska

Date: February 28th

Must-watch for its brutal environment that only superhuman willpower can conquer.

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

Crankworx Rotorua © Graeme Murray/Red Bull Content Pool

CranKworx Rotorua – Revolutionizing Enduro Racing Culture

Location: Rotorua, New Zealand

Date: March 9th-13th

Spring's first major enduro race awaits at CranKworx Rotorua with an exciting format of five days of racing. Will we see another new star emerge after last year's Brett Rheeder?

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 - The Battle for Supremacy

Location: Lourdes, France

Date: April 9-10

A young Loïc Bruni claimed his first UCI World Championship title last season. Can he maintain his dominance and claim victory again this year?

The men start the XCO World Cup Nove Mesto.

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

UCI XCO MTB World Championship - A Tale of Two Brothers

Location: Czech Republic

Date: June 28-July 3

This year's UCI Mountain Bike Cross-Country (XCO) and Downhill (DH) Championships will be held separately for the first time ever. The XCO event takes place from June-end to July-start in Nové Město.

Mathias Fluckiger has a chance to outshine his brother Lukas and win gold.

Coco Zurita performs at BMX Vert Finals at X Games Austin.

Coco Zurita/X Games/Austin @ Garth Milan/Red Bull Content Pool

X Games - Celebrating Three Years in America

Location: Austin, USA

Date: June2-5

The third anniversary edition of X-Games promises thrilling action-packed events like BMX Park & Dirt races.

Daniel Sandoval seeks to retain his crown while Daniel Dhers' experience could make him a dark horse contender.

环法自行车赛（Tour de France）

The prestigious Tour de France returns for its103rd edition on July1st. This three-week long event includes climbing iconic landmarks such as Mont Ventoux. Last year's champion Chris Froome is favored once again this season due to his well-rounded skills as a road cyclist but Peter Sagan may prove him wrong with improved climbing abilities added to his arsenal.

Trans-Siberian Extreme — The Longest Stage Race In The World

From Moscow to Vladivostok covering an incredible distance of almost ten thousand kilometers over two weeks starting from July5th; Red Bull Trans-Siberian Extreme challenges cyclists worldwide pushing them beyond their limits just like Siberia does with its railway line traversing through Russia’s vast expanse.

Brandon Semenuk tucks no-hander during Red Bull Joyride.

Brandon Semenuk / Red Bull Joyride / Scott Serfas/Red Bull Content Pool

Red Bull Joyride — Whistler Park Presents Its Best Slopestyle Course

Whistler park becomes one more stage for slopestyle competitors where they compete against each other before taking part into bigger global competitions.

Aaron Gwin puts practice into effect during Val di Sole finals day.

Aaron Gwin/Bartek Woliński/Red Bull Content Pool

UCI DH MTB Worlds — Aaron Gwin Seeks To Fill His Medal Collection

Val di Sole hosts Italy-based downhill championships between September8-11. Aaron Gwin has dominated numerous tracks throughout various seasons but still lacks world championship medal which he hopes would change this year.\