Road Bike Components

Being aware of what it is your are buying when you decide to purchase your first road bike is the key to making the correct purchase. You’re more informed and confident when comparing and negotiating the price for your new Giant road bike.

With the popularity of the sport growing each year, so has the need for a wider choice of components, each with different functions and will in some way affect the performance of your bike over time. Of course, be aware that there is the usual marketing factors at play here, with the beginner, novice, professional and elite ranges of all components being offered for sale, each with their own features and benefits to the rider.

Shimano www.shimano.com.au are one of the worlds largest manufacturers of cycling components. You’re probably familiar with Shimano for their dominance in the fishing tackle market.

Shimano components on Giant road bikes are pretty much standard these days.

Shimano Road Group Sets
Shiamno Tiagra Components (Entry Level – Sora used to be the entry level)
Shimano 105 10 Speed Silver
Shimano 105 10 Speed Black
Shimano Ultegra 6700 10 Speed

Shimano Dura-Ace 10 Speed 7900

Shimano 7900 Dura-Ace Group Set
Crank & Chainring
The chainring is the large front ring that the chain fits onto and the crank is the long arm attached to the chainring at one end and the pedals at the other. The centre of the crank lines up with the bottom bracket and is attached through the bike frame with the bottom bracket bearing set, complete with sealed spindle and adapters.

The crankset is forged from aluminum and is thin walled, lightweight & strong. The hollow chainring is also lightweight and rigid. The tooth design on the chainring is not all spikes, some of them are half spikes which makes for better chain contact, performance and longevity.

Features
Model Number – FC-7900
Crank Construction – HOLLOWTECH II
Cassette Compatibility – 10-speed
Chain Compatibility  - Super Narrow HG for 10-speed
Hyperdrive – yes
Dual SIS  - yes
Reinforced Spider -yes
Chainring Sets – 53-42T, 52-39T, 53-39T, 54-42T, 55-42T, 56-44T
Bolt Circle Diameter – 130mm
Crank Arm Length – 165/167.5/170/172.5/175/177.5/180mm
Crank Arms – forged aluminum/anodized
Chainrings -aluminum/anodized
Chain Guard – no
Bottom Bracket – SM-BB7900
Chain Line – 43.5mm
BB Shell Width – 68/70mm
Average Weight -

Cassette: The Dura-Ace cassette (sprocket) has a wide selection of sizes to suit the needs of a wide range of cyclists needs, ranging from the 11-21T, starting with the smaller cog with 11 teeth and the largest one being 21 teeth to the largest (cog 10), the 12-27T. Each of the cassettes features 4 titanium sprockets for strength and durability.

Features

● Revised gear sprocket design | Precise & reliable shifting
● 8 cassette combinations | To accommodate more cyclists
● Rigid aluminum carrier | Lightweight & rigid
● Four titanium sprockets | Lightweight
● Weight: 163.2g (11-23T)
● NOTE: CS-7900 11-27 and 11-28 require the use of RD-7900 or RD-6700
Sizes

Brakes
The Dura-Ace 7900 brakes present a new, durable shoe compound that produces 210% the stopping power in wet condition, 120% in dry conditions and 50% longer wear.

Model No – BR-7900
Brake Type – Super SLR dual pivot
Brake Pad Types -R55C3
Cartridge Shoe Holder – yes
Caliper Material – cold forged aluminum
Caliper Finish – anodized
Average Weight – 293g (F&R)

Features
● Enhanced brake arch proportion | Quick & predictable linear response
● Low-profile housing stop | Improved routing for reduced friction
● New compound brake shoe | Improved stopping power
● Spring tension adjustment | Custom feeling
● Adjustable toe-in | Effortless setting
● Titanium center bolt | Lightweight

Front & rear Hub
The hubs support the wheels and spokes.

Features
Model Number – HB-7900
Over Locknut – 100mm
Axle Type – 108mm
Stainless Steel Ball Bearings – yes
Contact Sealing – labyrinth and contact seals
Spoke Holes – 36/32/28/24, 32/28/24/18 (aero)
Spoke Hole Circle – 40mm
Hub Shell – cold forged aluminum/anodized
Center to Flange (Right) – 37.0mm
Center to Flange (Left) – 37.0mm
Average Weight w/o QR – 125g (59g)

Shimano Dura-Ace DI2

The standard conmponents on a road bike can be classed as:
Brakes (97)

Cassette
Chain
Cranksets & Bottom Brackets
Derailleurs (front & rear)
Forks
Gear Shifters
Handlebar Grip
Handlebar
Pedal
Wheels (Rims & Hubs)
Seat Post
Seat
Stem
Tubes & Tyres

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