for downhill? Those weights are, errr, ‘impressive’! Also i’d be wary of any online shop with massively discounted stuff not showing as ‘in stock’.
Had loads of intense tyres over the years but not those ones so unable to comment on the ride/gripof the ones you’re looking at. 909 ‘s have been ok to me until it gets muddy (sounds like GW’s experience of the comp 50) : I see winstanleys have had a few versions of them too. The world cup ones were grrrreat in proper bone dry dust and really rather frightening in anything less dry.