Here are a few off the top of my head. Some are bike related, some are not.
  • AV - Amici Veloci
  • DH - Dear husband
  • DH - Downhill
  • LBS - Local bike shop
  • LOL - Laughing out loud
  • MTB - Mountain bike
  • ROFL - Rolling on the floor, laughing
  • SK - SadieKate
  • SO - Significant other
  • SS - Single speed
  • TE - Team Estrogen
  • WSD - Women's specific design
  • XC - Cross country
Any others?