10kg isnt nothing special these days,most of bikes are around 10kg,go visit tartybikes if u dont belive me,he was riding befour with echo tr rear rim also.10 kg isnt light anymore.8+ kg is light.And if he would have 8+kg bike i bet its +cm everywhere.PS i did not say its heavy just it isnt something special.
example: http://www.tartybikes.co.uk/26_inch_trials_bikes/echo_pure_sl/c47p11611.html change rims and change tires for tryall light ones u got 8+kg bike