The thunder burt evo tl easy snakeskin 29 tyre from schwalbe was developed to combine the best of the racing ralph and the furious fred the outcome is the thunder burt which sits almost exactly in the middle of the racing ralph and furious fred weight wise the tread pattern features lots of small lugs with close shallow lugs down the centre and slightly deeper more spread out lugs on each side giving a similar grip level to the racing ralph and a better rolling resistance compared to the