The rims are aluminium and spokes are steel.

There are 24 spokes on rear and 20 spokes on front.

Weight of Mavic Aksium

• Front: 920g
• Rear: 1060g

If your looking to save every possible gram then Mavic Aksium is not for you. (for example, the Mavic Kyrsium are nearly 500 grams lighter, but double the price.

• Mavic Aksium at Wiggle.co.uk
• Mavic Wheels

MDT Disc wheel. Cost £500. Quite light. Good Value

Buying a disc wheel is one of the best ways to improve the aerodynamic performance of your time trial bike. They are expensive – you can easily pay £500. But, they do make a difference. Also, the faster you go, the more aerodynamic drag they save. Disc wheels work by smoothing the passage of side wind. Less wind turbulence means less drag and faster times.

A flat carbon disc wheel has an aero drag of 97grams. This compares to an aero drag of 154grams for a standard 18 spoke wheel (source: bsn)

The weight of a disc wheel is not as important as the aerodynamic aid. Even on the hilliest of time trial courses, you will go quicker on a solid disc wheel. Chris Boardman used a disc wheel for winning the national hill climb championship. I don’t advise this, but aerodynamics are much more important than weight. Also if you are going to be doing a lot of hilly time trials, look to buy a light weight carbon disc – some of them are surprisingly light.

Zipp Disc Wheels

Zipp Sub 9 Rear Tubular will cost over £1,400 but is one of the top disc wheels for aerodynamic performance.

Slightly cheaper is the Zipp 900, still over £1,000. Weight just 936grams with a cassette hub. Dimpled surface, adaptable for track.

Zipp Disc Wheels at Wiggle

Mavic Comete Disc Wheel

One of the best disc wheel on the market. The Mavic comete is not completely flat, but lenticular shape. It weighs 1,285grams (tubular or clincher)

• Training for a 10 mile time trial
• Position on a time trial bike