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Old 07-01-2012, 12:02 AM
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Allen_Wrench Allen_Wrench is offline
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Default Re: Glossary Of Motor Bicycle, bicycle parts and tools

Head tube: this is where you should mount your handle bar stem, complete with appropriate bearings, washers, etc.
Handle bar stem: holds your handle bar in your desired, fixed position (if you remembered to tighten the clamping bolt). Otherwise, If you should happen to turn your handlebars, the bike may continue on its path toward that glass storefront window.
Top tube: spanning the distance from the head tube to the seat post, this is the tube your crotch will encounter should you suddenly slam on the brakes and slide off your seat.
Down tube: this spans the distance from the head tube to the bottom bracket, and is often too big for a front motor mount.
Seat tube: holds the seat post, unless you've built a board track replica; then it's just in the way up top.
Chain stays: these span the distance from the bottom bracket to the rear dropouts and the ends of the seat stays, and are the first thing a maladjusted drive chain will chew through. Thus leaving you to get a new frame or haggle with a professional welder.
Seat stays: span the distance from the seat post down to the rear dropouts. Often the first thing to break on a cheap bike, so I've read.
Bottom bracket: where the crank lives. And where you put the adapters when you discover you need an extra-wide crank after you've already mounted the engine.
Rear (and front) dropouts: are where you mount your wheels. They are so-named because, if you do not tighten down your wheel bolts correctly, your wheels will drop out.
Pedals: where you put your feet and what you push against to make the bike move. The left pedal is threaded for the left side of the crank. The right pedal is threaded for the right side. If you wish to amuse yourself, put them on wrong and watch them come unscrewed as you ride.
Crank: this is where you mount your pedals (on their correct sides, you daredevil!) and where the pedal sprocket is mounted. The stock cranks are sometimes too narrow to deal with motors. The stock pedal sprockets can get in the way sometimes too. You'd think they could build 'em with motors in mind.
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Last edited by Allen_Wrench; 07-01-2012 at 12:07 AM.
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