yo, ive got a brand new 36h echo urban rim which im gonna lace to a 36h tryall h hub. and basically i wanna make it light as possible so im going to single wall the rim and file out the holes like an onza diamond rim. has anyone single walled a urban rim before ? whats the best way of doing it? and do you have any tips? shall be having a go at this on sunday so will post up some pics if anyones interested. cheers.