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

Iditarod, the world's most brutal solo bike race. A 350km grueling mountain road endurance test for riders who must brave extreme cold and scarce supplies in Alaska's tundra.

Location: Alaska

Date: February 28th

Must-watch reason: Only those with extraordinary willpower can complete this arduous race, as the harsh Alaskan winter environment is not for the faint of heart.

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

Crankworx © Graeme Murray/Red Bull Content Pool

CranKworx Rotorua

The revolution of mountain bike racing continues at Crankworx Rotorua. A five-day event featuring new formats and large-scale mountain biking culture.

Location: Rotorua, New Zealand

Date: March 9-13th

Must-watch reason: Witness the first spring enduro competition at CranKworx Rotorua with its renowned slopestyle course. Will we see another rising star emerge after Brett Rheeder's victory last year?

Loic Bruni competing at the 2015 Lourdes Downhill World Cup round in France's famous pilgrimage city

Loic Bruni © Lukas Pilz

UCI MTB World Cup

Location: Lourdes, France

Date: April 9-10th

Must-watch reason: Loïc Bruni, French young gun who won his first World Championship title last season. Can he maintain his dominance and claim more victories?

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

This marks a historic separation of cross-country and downhill events within UCI championships. The six-month-end to seven-month-start championship takes place from late June to early July in Czech Republic.

Location: Czech Republic

Date : June 28-July3rd

Must-watch reason：As everyone focuses on Rio Olympics this year，the world championships could potentially bring out unknown dark horses among participants. Mathias Fluckiger has an opportunity to break through successfully.

Coco Zurita performs at BMX Vert Finals during X Games Austin

X Games

Celebrating its third year held in America，X-Games offers thrilling BMX Park、Vert & Dirt competitions once again.

Location：Austin，USA

Date：June2nd-5th

Must-watch reason：Daniel Sandoval aims for back-to-back titles but don't count out Daniel Dhers' wealth of experience.

环法自行车赛

Enjoying worldwide fame，the Tour de France returns for its103rd edition spanning three weeks，climbing iconic landmarks such as Mont Ventoux。Last year's winner Chris Froome is considered a strong contender but Peter Sagan may surprise us with his climbing skills.

Location：France

Date：July2nd -21st

Must-watch reason：Sagan has been known as an underdog yet consistently improving climber；his extensive time trial experience makes him worth keeping an eye on.

Mikhail Ignatyev from Russia、Paolo Aste from Italy、Thomas John from Germany perform during Moscow-Kostroma stage at Red Bull Trans-Siberian Extreme

Trans-Siberian Extreme

A legendary journey mirroring Russia’s Trans-Siberian Railway; it spans over a staggering distance of nearly10 thousand kilometers.

From Moscow to Vladivostok (a total length of almost10 thousand kilometers)

Start date : July5th

End date : July28

Brandon Semenuk tucks no-hander at Red Bull Joyride

Red Bull Joyride

Whistler Mountain Bike Park Boneyard becomes the ultimate Slopestyle stage.

Location : Whistler Canada

Date (TBC) August

Must-watch reason：Canadian duo Brandon Semenuk and Brett Rheeder clash; both are former winners or potential successors.

Aaron Gwin practices before finals day Val di Sole 2015

UCI DH MTB World Championships

Val di Sole Italy \ September8-11\

Aaron Gwin might be king-of-the-mountain cup circuit but lacks one medal—world champs gold._ This season could be his chance for all-around glory?