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Shimano GRX RX812 Rear Derailleur
in stock1-2 weekdays
SRAM Spacer for chainring bolts 5 pcs.
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CONTEC Vario Drop-A-Gogo II dropper post 125mm Ø27.2mm 450mm black
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Shimano Sora chainring 50T BCD110 black for chain guard
Out of stockExpected 30/09/2026
Tire Cobra 2 x 16 (20 x 2) for transport front wheels
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Shimano Sora R3000 front derailleur (double) soldering
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DT Swiss Cassette Case Micro Spline 3 Pawls
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Selle SMP VT30C saddle GEL sport black
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Atran Velo Cargo Mini AVS Front Luggage Carrier
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Shimano R8100 52T blade
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76,99 €
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Grip set red/black with gel
Bike attitude
7,99 €
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Ergotec Comfort double kickstand
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Maxxis Dissector EXO/TR MTB folding tire 27.5"x2.40 (61-584)
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Shimano Dura Ace 12 Speed Cassette 11-30T
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Fizik Vento Argo R3 140 mm.
Fizik
124,99 €
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Promovec Display LCD center
Promovec
142,99 €
Pre-orderExpected 03/09/2026
Continental Tour Ride Extra 12x1/2x2 1/4"
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Crankset with 3 Chainrings 42/32 / 22T 175 mm Pedal Arm
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Schwalbe Tire 24x1 (25-540) Gray
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DT Swiss Cassette case 10/11 speed 3-pallet
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Schwalbe G-One allround performance TLR gravel folding tire 700x40c black
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Shimano Deore M5100 2x11 Speed Shift Lever Left Side Without Display
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Shimano Altus Shift Lever 3x8 Speed ST-M310
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Selle Royal Stracciatella Lookin Evo saddle Sport Moderate
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SRAM protector for carbon pedal arm
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News

Spare parts for bicycles

There are an incredible number of different bikes, and almost all models are made up of different parts throughout several different brands. There are also a great many different spare parts for bikes throughout the categories of gear systems, brakes, handlebars, saddles, tires, tubes, handlebar grips, stems, locks, headsets, frames, front forks, and many other components.

 

Gear systems and brakes

Overall, there are two types of gear systems; external gears and internal gears.

External gear systems have a rear derailleur, cassette, or chainring, and sometimes a front derailleur if there are also gears on the front of the bike. Internal gears have a gear hub, often with 3, 5, 7, or 8 gears.

On external gears, you can have many more gears, since you multiply the number of chainrings at the back by those at the front. So you count all the combinations that can be done on the bike. At the back, there can be up to 12 chainrings at the front, so there are 1, 2, or 3 chainrings on the crankset.

Common to both internal and external gear systems is that there is a shift lever on the handlebars that makes it possible to change gears, most systems work with cable and wire pulls, while other newer systems are electronic.

 

Cockpit - handlebars, stem, seat post, and saddle

The handlebars, the stem, the seat post, and the saddle. The handlebar grips or the handlebars are often called the cockpit of the bicycle.

These components can come in many different shapes and styles, but the commonality is that almost all bicycles have these parts.

 

Handlebars

If we look at handlebars, there are different types of handlebars for different bikes. Handlebars are known to come in different shapes and sizes, such as downward-curved handlebars for racers. In contrast, there are also straighter handlebars that we know from mountain bikes, and in addition, the often more backward curved handlebars that are known for their use in city bikes and everyday bikes. The handlebars on BMX bikes also stand out a bit, as they are often much higher.

 

Stem

In general, there are two types of stems; the ahead-system, where the stem does not go down into the frame's crown tube but it's mounted on the outside of the front fork stem that goes up through the frame. In addition, there is also the "old" type, which is still available on many new bikes, where the stem goes down into the frame and connects to the front fork.

Both types are available in different lengths, in versions that are adjustable, and for different handlebar diameters.

When we talk about diameter, it is obvious to also mention seat posts. When you order a new seat post, it is important to check which diameter you need. There are some measurements that are widely used, but in addition to the most normal ones, there are a lot of other sizes. The most normal is 27.2mm and 31.6mm.

 

Different materials

The handlebars, seat posts, and stems are available in different materials such as carbon, steel, and aluminum.

Handlebar grips and handlebars are also available in different materials: foam, leather, plastic, rubber, cork, etc.

Their most important task is to give you the right comfort when you cycle.

 

If you have questions about the selection of spare parts or need help finding the right spare part, you are more than welcome to contact us.

Then we will do our best to help you.