I am looking at a hardtail frame that would be used for XC races.
I had a look at the Viper Scandium (viper-bikes.co.uk).. I cannot find any reviews as yet.. They are popular on continental Europe.
This is what they say about the frame : FRAME: 7005 series alloy fully double butted front triangle with tear drop profile down tube. Carbon fibre chainstays “Flex” instead of pivoting to provide 4” of travel which is controlled by the Manitou SPV 3 Way air shock.
I didn't know an air shock can be used to control flex of carbon chain stays ? does this sound right ?
I guess around 3lbs is plenty light enough