If you have an 04, don't get a gpr! I hav had only problems with getting on the bike. They send you the wrong nut to start with, "In the package" but it is for a 04 RC51. So I called orderd the new one that was for the 2004 RC51, and 13 bucks later. The wrong nut.
Called GPR back to talk to them and find out why.
Well turns out they never made a nut for the 04 rc51. But with the stock nut it only goes on about 2.5 mm about 3 threads, not good.
So now I am waiting another week for them to send me a 41mm socket "thin walled" because a normal 41mm socket will not fit.
Other then that it looks really goo on the bike, just no worky until I can get the socket.
And I am not to sure that they really sent it out yet.
Oh and forgot to say that, The first time I called about the nut, A guy told me he would send it to me for free. but really what he meant to say is that if you pay for it I will send you one, but I am too lazy to tell you this right now, and I will just fake it all with taking your address... and not send it to you.
So after remerering this, It will problay be a week from now and I will have to call them and reoder it and payfor the shipping, so that it gets here....
So that is my story with GPR,
couldn't even tell you if it works good.......