AST Dew Tour Toyota Challenge event

BMX Vert

What: Think of it as snowboarding on two wheels and in a halfpipe. Cyclists go up and down the ramps doing kick flips, tail whips and 360 turns inside EnergySolutions Arena.

When: Prelims — tonight, 6:30 p.m.. Finals — Friday, 5 p.m.

Whom to watch: Jamie Bestwick and Chad Kagy are in a battle for the series lead.

BMX Park

What: Riding over and off series of ramps, walls, jumps and bars, cyclists will turn EnergySolutions Arena into the biggest neighborhood BMX party of the year. The difference? These guys are good — really good.

When: Prelims — Saturday, 2 p.m. Finals — Sunday, 2 p.m.

Whom to watch: Daniel Dhers is running away with the season trophy, but Mike Spinner and Rob Darden will provide plenty of thrills.

BMX Dirt

What: Like riding the bike on the local trails, but with triple tail whips and double back flips thrown in to make things interesting. Happening in front of the grandstands on South Temple, expect lots of big air, big style and a few hard crashes.

When: Prelims — tonight, 8:30 p.m. Finals — Friday, 7:30 p.m.

Whom to watch: Ryan Nyquist and Luke Parslow are the favorites, but watch out for locals like Tim "Fuzzy" Hall and Mike Aitken.

BMX Supercross

What: This is an actual Olympic sport. Starting atop a massive ramp, cyclists race in packs over bumps, berms and jumps to try to advance to the next round. One false pedal stroke, though, could spell the end for some.

When: Time trials — Friday, 3 p.m. Quarters, semis and finals — Saturday, 3 p.m.

Whom to watch: 2008 Olympic silver medalist Mike Day and bronze medalist Donny Robinson will be in action.

Skate Vert

What: One of the signature events of the Dew Tour. Athletes will go for big air in the EnergySolutions Arena halfpipe while whipping out 720 spins, flips and dozens of other gravity-defying tricks.

When: Prelims — today, 1 p.m. Finals — Sunday, 4:30 p.m.