Tread: Summer tyres generally have a lower height or flatter tread which rolls faster and ‘quieter’ with less buzz. They shrug off potential impact punctures much better as a result and can also ‘self heal’ small thorn punctures. That means they just need a rim strip, a sealable valve and some liquid sealant to make them airtight rather than a separate inner tube. Tubeless: Most tyres and rims are now ‘tubeless ready’. Supple lightweight tyres accelerate easily and mould to the terrain for extra grip and smoothness but can be vulnerable to tears and punctures. Carcass: The body of the tyre can make a big difference to the weight, toughness and feel. 
Compounds can be altered in two or more areas of the tyre to balance these characteristics. The hardness is expressed as a durometer figure, with a lower number meaning softer, gripper rubber. Compound: The harder the rubber, the faster the tyre will roll and the longer it will last but the less it will grip.
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