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 journey through Alaska's tundra under extreme cold and limited supplies.

Location: Alaska

Date: February 28th

Must-watch for the sheer determination required to complete this brutal race in one of the harshest environments on Earth.

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

Crankworx Rotorua - A Reformation of Mountain Bike Culture

Rotorua, New Zealand will witness an overhaul of downhill racing culture during Crankworx Rotorua. The five-day event includes new competition formats and big-mountain bike culture.

Location: Rotorua, New Zealand

Date: March 9-13th

Brett Rheeder won last year's slopestyle competition; can we expect another newcomer to rise to fame?

Loic Bruni competing at the 2015 Lourdes Downhill World Cup round in France

UCI MTB World Cup

The UCI MTB World Cup will be held in Lourdes, France from April 9-10th. Loïc Bruni claimed his first-ever World Championship title last season; can he maintain his dominance?

Location: Lourdes, France

Date: April 9-10th

This marks the first time ever that cross-country and downhill events are separated within UCI Worlds. The XCO championship takes place from June-end to July-start in Czech Republic.

Location: Czech Republic

Date: June-end to July-start (specific dates TBA)

Mathias Fluckiger and his brother Lukas have a chance to emerge victorious at Nové Město.

X Games

As part of celebrating its third year hosting events across America, X-Games offers thrilling BMX Park & Dirt races.

Location: Austin, Texas USA

Dates : June2nd – May5th

Daniel Sandoval aims for back-to-back victories but Daniel Dhers' extensive experience cannot be overlooked.

Tour de France

The prestigious Tour de France celebrates its centennial edition this year with three weeks of racing that features iconic climbs such as Mont Ventoux. Chris Froome emerged victorious last year; he remains a top contender for this year's victory.

Locations : Various locations throughout France

Dates : July2nd – July21st

Peter Sagan is known for unpredictable performances which could make him an exciting dark horse candidate.

Red Bull Trans-Siberian Extreme

Covering over nine thousand miles from Moscow to Vladivostok along Russia's legendary Trans-Siberian railway line makes Red Bull Trans-Siberian Extreme one of the longest stage races globally.

Locations : Starting point is Moscow with final destination Vladivostok (total distance approximately nine thousand eight hundred fifty-nine kilometers)

Dates : From May1st till May28th

Brandon Semenuk has been crowned Joyride champion four times; Brett Rheeder seeks to surpass him this season.

Aaron Gwin dominates every track except when it comes down to winning medals at championships. Can he change history by taking home gold medals?