This question and its answers list the names of bike parts and cycling concepts.
- Make sure you only put one term per answer!
- Try to include an image if applicable
- Include sources that contain detailed information
- Add a link to the index in this question using edit.
Also, I made this a community wiki, so that anyone will be able to edit it, and to stop rep-hoarding
There's a handy reference at the Park Tool Co. website, a bike repair map; it's a diagram of a bike with all the parts labeled, and is very handy! At the moment, the diagram is up at parktool.com/blog/repair-help. (They've changed the URL in the past, so this link may break.)
A road bike has the following parts (source):
A mountain bike has the following parts (source):
Edit: This page is meant to identify what things or concepts are (as per this thread in meta). If you want to recommend an accessory or a specific product you've found handy, please use the accessories page.
BCD (Bolt Circle Diameter)
Bottle Cage / Bottle Holder
Chain Tug/Chain Tensioner
Coaster Brake (foot brake / pedal brake)
Derailer Hanger/Derailleur Ranger
Hose Clamp aka Jubilee Clip
Lawyer lips/lawyer tabs
LBS/Local Bike Shop
Presta Valve/Presta Tube
REI (Recreational Equipment Inc)
Schrader Valve/ Schrader Tube
Suspension Fork/Rear Shock
Tire Lever/Tire Iron
Track Pump/Floor Pump
Triathalon Bars/Triathlon Bars