Sacramento PITS Inc (SACTO-PITS)
Northern California Trials Club

Southern California Trials Club (SCTA)
Southern California Trials Club

USA TDN (Trial Des Nations)

American Motorcyclists Association (AMA)
America’s motorcycle event governing body 

MotoTrials Clubs
USA and some Canadian trials clubs and information

American Beta
Beta Motorcycles

Gas Gas USA
Gas Gas Motorcycles

Oset USA
Oset Electric Motorcycles

Ossa USA
Ossa Motorcycles 

TRS Motorcycles

Vertigo USA
Vertigo Motorcycles

Scorpa USA
Scorpa Motorcycles

Sherco USA
Sherco Motorcycles

Ryan Young Products
Trials Accessories

Lewisport USA
Trials Accessories

On The Pegs Magazine
Monthly Off-Road Online Magazine

Cycle News
Online motorcycle news