Was surfing the web for a post 2010 subframe without the bracket and came across an aluminium one for the F3 with a claimed weight of 1kg! Was wondering is there any for the newer F4? Think of the weight saving! Evolutionbike.it has a sub category for the subframe but it states "coming soon". The bracket is making battery removal a pain and a used subframe cost £300+ whereas a new F3 aluminium subframe cost about the same.