Funny how i remember so many motorcycle associations, even with shows that weren't really about bikes.
Monk (Monk would NEVER ride lol)
Friends (they were in NYC...not much great riding in the city)
X-Files (too busy chasing aliens and dodging evil gov't to ride)
Seinfeld (too fussy to ride)
Night Court (they never left the court house - who knows, maybe the all rode to work every night. lol)
MASH (motorycles! - remember when BJ found and fixed up a war time bike/sidecar rig?
Simon & Simon (Rick must've had a bike, though I don't recall one ever appearing)
Facts of Life (motorcycles! - Jo was a rider and a dreamgirl and the main reason to watch the show)
Street Hawk (motorcycles!)
Battlestar Galactica (vipers were the motorcycles of space fighters.
Welcome Back Kotter (Vinnie and/or Epstein should've had bikes...but again, in NYC, not much point)
Emergency 51 (they rode fire trucks and ambulances)
Adam 12 (the drove police cars)
Happy Days(motorcycles! - the Fonz was a rider!)
Star Trek (original) (No bikes. But they did have one very cool means of transportation with a heck of a 0-60 time and a killer top speed.
Per the better half
(Had to make a 2nd life for her as I can't abide half of these
Buffy the Vampire Slayer
The Wonder Years
Sex and the City
Laverne & Shirley
Greatest American Hero