chain sprocket ratios

[Bartman]

Hey guys and gals, merry xmas and happy new year. My question is what is the standard front/rear sprocket ratio on a gen 1 (04) I think mine has been changed as my speedo seems to be WAAAY out 110km highway speed indicating roughly 130-40kmh! so I figure if I change back to original at least it will be closer? I realise they are not spot on even when new 8-10% quite often. I,m not interested in having ballistic excelleration because in standard trim the Busa has that already so going back to standard is not an issue. One thing I havent done is check the current sprockets but Iam confident they are not standard. It needs a new set soon thats why the question. One last thing where does the speedo get its info from (RPM?). Cheers Bartman