Mazlow Bicycles : 2008 Specialized Globe Centrum Sport


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		Specialized Globe Centrum Sport

Model Year: 2008
Bike Type: Comfort
MSRP: $550.00

The Globe Centrum is a totally new breed of commuter bike. One that's both aggressive and simple. That kind of versatility requires certain design details, such as super low standover height and light weight for maximum maneuverability in stop-and-go traffic, plus an internally geared hub and disc brakes for unimpaired urban performance.

Frameset

Frame
Frames are structured of tubes of metal which support all of the bike and rider. Before the 1980's, all frames were made of steel, but nowadays lighter alloys of aluminum or titanium and even carbon fiber have become available. All operational parts and assemblies are attached to the frame.

Specialized A1 Premium Aluminum, fully manipulated, low center of gravity, low standover, integrated HS, forged 3D horizontal dropouts, disc only

Fork
Attaches the steering system (handlebars and stem), to the front wheel.

Specialized A1 Premium Aluminum steerer and lowers

Rear Suspension
The system used to suspend the rider and all or part of the bicycle in order to protect them from the roughness of the terrain over which they travel. Bicycle suspension are used primarily on mountain bicycles.

Bottom Bracket
Can refer to either the short threaded tube that runs perpendicular to the rest of the frame tubes where the cranks attach, or the actual set of spindle and bearings that threads into the frame.

Shimano BB-UN-25, cartridge bearing, 68 x 113mm

Wheels and Brakes

Tires
A tire is made up of three parts
1. The beads are two hoops of strong steel wire (or, sometimes Kevlar®.)

2. The cords, cloth forming the body of the tire, woven between the two beads. Most modern tires use nylon cords.

3. The rubber, which covers all the other parts. The rubber on the part that contacts the road is thicker, and is called the tread.

Nimbus Sport, 26x1.5", 60TPI, wire bead

Front and Rear Hub
The middle part of a wheel, to which the inside ends of the spokes attach. Consists of an axle, which attaches to the fork ends; a shell, to which the spokes attach, and bearings to connect the axle to the shell, permitting the shell to revolve around the axle. In the case of a rear hub, the shell would also have a provision for attaching the rear sprocket(s).

Specialized Hi Lo disc, 28h, CNC flange and disc mount, polished races, alloy QR

Specialized single speed disc, 135mm sealed, 6-bolt

Spokes
The wires connecting the rim to the hub of a bicycle wheel. 32 spoke wheels are the most common. Manufacturers tout this as an advantage, because it saves a very small amount of weight.

1.8mm (15g) stainless

Front and Rear Brake
Caliper brakes use a pair of calipers to grab the rim to stop the bike. Usually operated by a brake lever.

Coaster brakes are a type of brake mechanism enclosed inside the rear hub and operated by stepping backwards on the pedals. Usually found on children's bikes.

Disc brakes are generally found on more expensive bikes and provide greater stopping power. The disc system is similar in design to an automotive disc brake.

Shimano BR-M415 mechanical disc

Brake Levers
The operating control for a brake system, usually found on the handlebar.

Shimano mechanical disc

Drivetrain

Shifters
A bicycle shifter or gear control or gear levers is a component used to control the gearing mechanisms and select the desired gear ratio. Typically, they operate either a derailleur mechanism or an internal hub gear mechanism. In either case, the control is operated by moving a cable that connects the shifter to the gear mechanism. Shifters are mounted on the down tube of the frame, on the handlebars, or at the ends of triathlon bars. Major manufacturers of shifters include Shimano, Campagnolo, and SRAM.

Derailleurs
Derailleurs are a variable-ratio transmission system commonly used on bicycles, consisting of a chain, multiple sprockets and a mechanism to move the chain from one sprocket to another. Modern front and rear derailleurs typically consist of a moveable chain-guide that is operated remotely by a Bowden cable attached to a shift lever mounted on the down tube, handlebar stem, or handlebar. When a rider operates the lever while pedaling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets.

Crank
The two-armed mechanism that connects the pedals to the front chainring.

Specialized single speed design 38T w/ CNC guard

Chain
Bicycles use a roller chain to connect the cranks to the rear wheel.

KMC single speed

Pedals
The part of the bike you put your foot on. The axles of the pedals screw into the cranks.

Globe anti-slip composite

Components

Saddle
Frequently called a "seat", traditional saddles are made of leather stretched over a metal frame, hammock style. This type of saddle requires care and careful breaking in, but when this is done the classic leather saddle moulds itself to fit the particular anatomical shape of its rider.

Leather saddles are particularly well suited to long-distance tourists, and have their greatest advantage in hot weather, because they are porous and able to breathe, unlike plastic saddles which have closed-cell foam (also known as "gel") as a cushion.

Specialized Body Geometry

Seat Post
The tubular support that holds the saddle. The seat post telescopes into the seat tube of the frame, providing the adjustment for saddle height. Older seat posts, and those on less expensive bicycles, are basically pieces of pipe. A separate clamp attaches the saddle to this type of seat post. Modern, high-quality seat posts have the seat clamp mechanism built into the top of the post.

Specialized alloy two bolt head, 27.2 x 350mm

Seat Clamp
Attaches the saddle to the seat post.

Specialized forged alloy

Handlebars
A drop handlebar is one in which the middle of the bar is the highest point, or nearly. Most bicycles built for fast or long-distance riding have drop handlebars, which provide a range of different grip positions, allowing the rider to change positions for variety and to accommodate different road/wind conditions.

Upright handlebars are used on most of the world's bicycles. They permit a fairly erect posture of the upper body, and are more comfortable for cyclists who ride at a low intensity level.

Specialized A1 Premium Aluminum, 600mm wide, double-butted 31.8mm, 15 degree sweep

Stem
The part that connects the handlebars to the steerer of the fork. Conventional stems for most bicycles with threaded headsets fit inside the steerer of the fork, and use an expander/wedge to attach to the steerer.

"Threadless" type stems clamp on to the outside of the steerer. "Adjustable" stems have the handlebar clamp unit mounted on a moveable part, permitting setting different amounts of forward extension.

SBC 3D Forged, two bolt, 31.8mm

Headset
The headset is the pair of bearings and bearing races (races are things that bearings sit in) at each end of the head tube that allow the fork to steer the bicycle smoothly.

1 1/8" threadless, integrated

Grips
The material on the handlebar used to better hold onto the bike.

Body Geometry Mtn., Kraton, closed type 130mm

Chain stay protector, chain catcher, derailleur hanger, clear coat

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