If you are running light weight race tyres they you need the lightest tubes you can find. Enter Continental Supersonic Inner Tube.

High quality inner tubes suitable for all makes of tyres. The ultimate ultra light butyl tube. 

• Super lightweight tube to match the Supersonic tyre range
• Presta valve - 60 mm
• All tubes have a seamless construction, with a mould-cured vulcanisation, to ensure uniform roundness 
• Weighs only 50g