I am looking for some advice on a warranty issue. My 2013 GRiSO front tire went flat. I took it to the dealer and they told me it was leaking from the valve stem because the o ring had failed. This, to me, sounds like a warranty issue but Moto Guzzi said "No, it's not". The dealer charged me $300 (not including a tire) to tell me that it was leaking air. I bought the bike from THIS dealership and to be charged $300 for 5 minutes work seems crazy to me. I would like to sue Guzzi because I think it's a warranty issue. I have read on different sites that this is an issue with the spoked wheels and from what I've read, Guzzi had covered it....except for mine (of course). I would appreciate any help that I can get.