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 - Singletrack Mountain Bike Festival Reforming in New Zealand. Including a five-day schedule, competition format and large-scale mountain bike culture.

Location: Rotorua, New Zealand

Date: March 9-13th

Must-watch reason: The first spring singletrack festival held at CranKworx Rotorua with its extreme slope style course. Will we see another rising star take the stage after last year's champion Brett Rheeder?

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

Loic Bruni © Lukas Pilz

UCI MTB World Cup - Lourdes Downhill Round

Location: Lourdes, France

Date: April 9-10th

Must-watch reason: Loïc Bruni, young French rider who won his first World Championship title last season. Can he maintain his top performance and dominate from the podium?

The men start the XCO World Cup Nove Mesto.

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

UCI XCO MTB World Championships - Separate Events Held for Cross Country & Downhill Races

This marks a historic split of UCI world championships into separate events for cross-country and downhill races. The cross-country event takes place during June-end to July-start in Czech Republic.

Location: Czech Republic

Date: June 28-July3rd

Must-watch reason：As all eyes are focused on Rio Olympics this year，the annual championship may witness unexpected dark horses emerging from among numerous participants。Mathias Fluckiger and his brother Lukas have chances to make their mark by winning Nové Město successfully。

Coco Zurita performs at BMX Vert Finals at X Games Austin

X Games Celebrating its third year hosting events in America offers thrilling BMX Park、Vert、and Dirt competitions.

Location：Austin，USA

Date：June2nd-5th

Must-watch reason：Daniel Sandoval took home gold medal at park contest last year but do not underestimate Daniel Dhers' rich experience having won five times previously as an X-Games Park Champion。

Le Tour de France (环法自行车赛) celebrates its centennial anniversary with its third week climbing iconic Mont Ventoux (旺图山) . Last season's winner Chris Froome is highly favored due to his versatility as an overall strong cyclist.

Location：France

Duration：July2nd-21st

Reason to watch：World champions like Peter Sagan often considered underdogs but has been consistently improving hill climbs with extensive time trial experience making him worth watching.

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

Trans-Siberian Extreme Ride — Longest Stage Race Ever Organized

Starting from Moscow spanning across Russia covering approximately 9159 kilometers

Starts Moskow ends Vladivostok（total length =9195 km）

Dates July5th till July28th

Reason to watch:

Two Canadian riders Brandon Semenuk 和 Brett Rheeder battling it out.

Semenuk holds four Joyride titles while Rheeder is seen as heir apparent.

Will Rheeder prove himself worthy of big stage success or will Semenuk hold onto crown?