American Motorcyclists Association (AMA)
America’s motorcycle event governing body
https://www.americanmotorcyclist.com/

USA TDN (Trial Des Nations)
https://www.mototrials.com/tdn.html
https://www.facebook.com/USATrialDesNations

MotoTrials Clubs
USA and some Canadian trials clubs and information
http://www.trialsclubs.us/

Sacramento PITS Inc (SACTO-PITS)
Northern California Trials Club
http://www.sactopits.org/

Southern California Trials Club (SCTA)
Southern California Trials Club
http://www.socaltrials.com/

Lewisport USA
Trials Accessories
http://www.lewisportusa.com/

FactoryOne Motorsports
Trials Accessories
https://factoryonemotorsports.com

Cycle News
Online motorcycle news
http://www.cyclenews.com/

​On The Pegs Magazine
Monthly Off-Road Online Magazine
https://on-the-pegs.com
​
Beta USA
Beta Motorcycles
http://www.betausa.com

EM USA
Electric Motion Motorcycles
https://www.electricmotion-usa.com

GasGas USA
GasGas Motorcycles
http://www.gasgas.com/

Oset USA
Oset Electric Motorcycles
http://www.osetbikes.com/

Sherco USA
Sherco Motorcycles
http://www.shercousa.com/

TRS USA
TRS Motorcycles
http://www.trsmotosusa.com/ 
​
Vertigo USA
Vertigo Motorcycles
https://vertigomotorsusa.com