those new urbans aren´t really strong.
I´m cracked mine after 7-8months of riding and I´m only 75kg....
and it was V brake version.
http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/hs1180.snc4/150240_1341803885245_1835642923_629138_2236422_n.jpg
but this is not bad as your of course
and light because is not good idea IMO