A bearing is the point of contact between a turning part and a non-turning part.
Acronym for Bicycle Motocross. BMX bikes are smaller, single-speed bikes made for people of all ages who enjoy riding, jumping or racing on dirt or riding on smooth surfaces. There are three major forms of BMX bikes BMX racing bicycles, Freestyle "stunt" bicycles and Dirt Jumping bikes.
A bicycle component that consists of the crank axle (bottom bracket spindle) and ball bearings. Crankarms are bolted onto the bottom bracket.
Brakes - Coaster
A type of brake, used mainly on juvenile and Cruiser bikes that is engaged by pedaling backwards.
Brakes - Disc
A type of brake that consists of a rotor and a caliper. The rotor is bolted to the hub and the caliper holds brake pads that push into the rotor to slow the wheel. Disc brakes are generally more powerful than the type that operate on the rim and are better in adverse conditions. They can be either mechanical cable operated or hydraulic with oil running in a hose. Found primarily on mid and high priced mountain bikes.
Brakes - Linear Pull
This is the generic term for a V-Brake. The V-Brake name is a trademark of Shimano.
Brakes - V
A type of brake that contacts the rims, common on mountain, hybrid and juvenile bicycles. V-Brakes are powerful and relatively easy to set up and adjust. V-Brake is a trademark of Shimano, other companies refer to their brakes of this type as linear pull brakes.
Bicycle frame tubes that have thicker walls at the ends where they are welded to other frame tubes. Thicker tubing at the ends adds strength while thinner tubes in the middle portions help minimize weight and help improve ride comfort by minimizing vibration.
Part of the bicycle that holds the front wheel. The fork steerer tube is inserted into the head tube.
Fork - Suspension
A fork that is designed to absorb shocks using coil springs or air springs. Generally found on mountain bikes, comfort bikes and some hybrid bikes.
The basic element of the bicycle; tubes that form the backbone to which all of the bicycle components are connected. Frames generally have the following parts: head tube, top tube, down tube, seat tube, seat stay, chain stay and bottom bracket shell.
Mountain bikes designed primarily for downhill riding, but still have the capability to pedal uphill. Most freeride bikes have beefy full suspension frames with 6" or more suspension travel and disc brakes
20" wheeled BMX bikes designed for use on smooth surfaces ramps or street. Freestyle bikes generally have 48-spoked wheels, strong front and rear brakes and pegs to assist with performing stunts
An older style gear cluster that threads onto the rear hub body. Freewheels are generally less expensive and heavier than cassette gear clusters.
Bicycle component that moves the chain across the front chainrings thus changing the gear ratio and achieving what is referred to as a gearshift.
Mountain bikes that have frames that allow both the front and rear wheels to move and absorb shock when they hit an object.
The flat or riser bar that grips, brake levers, and shifters are attached to.
Mountain bikes that have a rigid (non-moving) rear end.
Vertical frame tube onto which the top tube and down tube are attached. The fork steerer tube is inserted into the head tube.
Bearing component that secures the fork to the frame. Headsets can be either threaded or threadless.
High Tensile Steel
A type of steel used for bicycle frames.
Bicycle component located in the middle of the wheel from which the spokes radiate outward.
Also known as "city bikes", Hybrids have 700c wheels (approx 29" in diameter) with tires that are narrower than found on mountain bikes. Hybrids are similar to comfort bikes as they feature ergonomically-superior upright riding positions, suspension forks, soft grips, cushy saddles and wide-range gearing. Hybrid bikes are generally a bit more efficient than similar comfort bikes, but not quite as comfortable.
A very strong fiber, made by DuPont that is used in the construction of higher-end bicycle tires. Kevlar bead tires are also known as "foldable" tires and are, as the name implies, foldable. Kevlar tires are generally lighter than wire-bead tires.
Bicycle component that moves the chain across the rear cogs thus changing the gear ratio and achieving what is referred to as a gear shift.
The outer hoop of a bicycle wheel. The spokes attach to the rims via spoke nipples. Rims can be either steel, aluminum, or carbon fiber.
Mountain bike handlebars that feature an upward sweep providing a more upright riding position and greater stability
Road Bike (Flat Bar or Comfort Road)
Bikes designed for road use, flat-bar road bikes have a more comfortable, yet less-efficient upright riding position more similar to a mountain bike than a traditional drop bar road bike. Great for use on charity rides.
Road Bike (Race)
Once referred to as "10-speeds", Road bikes are designed for use on hard surfaces, drop bar road bikes have skinny tires, lightweight frames and wide gearing ranges. Road bikes are the most efficient bicycles.
Rotor (aka Gyro ®, Oyrg ®)
A device, found on BMX freestyle or dirt jumping bikes, located just above the headset that allows the handlebar to rotate without the brake cable getting tangled up.
A disc brake component consisting of a thin metal disc that the brake pads contact to slow the wheel rotation.
Bicycle tires that have less-aggressive tread designs for smoother riding qualities on hard surfaces.
Tire - mountain
Mountain bike tires are size 26in. and are generally available in widths from 1 inch to 2.2 inches.
Tire - road
Modern road tires are generally size 700C. Road tires can also be found in the older less common size of 27in. These two sizes are not compatible and it is important to know which size tire is appropriate for your rims.
Horizontal frame tube running from the seat tube to the head tube.
Measurement of the total distance that a shock can travel
Rubber bladder inside the tire that hold air. Come in a variety of sizes, can be either Presta or Schrader. Ultralightrefers to a tube with thin walls.