Welcome back to Chucks Big New Adventure for mountain biking races at the challenging course at Rocky Hill Ranch in Smithville, Texas in December. Chucks is Race #3 of the TMBRA Marathon MTB State Championship Series. Full marathon is three 17-mile laps while a mini-marathon is 1 lap with multiple age categories. Mini-marathon is also open to E-bikes. Prizes and swag awarded.

Spectators and cheerleaders welcomed.