Gearbox noise was road noise from tyres

[TOOC]

I bought my '98 bike 12months ago with 15KMls and was so disappointed to discover noise that I assumed was coming from the gearbox. I have just joined this site recently, but if I had done so when I bought the touring masterpiece, I would have learned that it was tyre/road noise. I had done some research on the problem and tried to remedy it by using fully syntheitc 15W40 oil but to no avail.
I was touring in the West of Ireland this summer and realised that the noise completely disappeared when riding on very smooth surface. I now just live with the noise and am happy that the problem is not mechanical. My tyres are almost new so I'll ignore the noise for the moment.

[Michvalk]

What kind of tires do you have on the bike? Maybe play with the pressures to minimise the sound

[pocobubba]

My Avon Venoms really sing when I'm in turn [ laid over ] but on the straight away they are quiet .

                                              Pocobubba

[Earl in Pensacola]

Are you sure that you have "Venoms"??  I thought that the Venom was discontinued a year or so ago, that is discontinued as a radial tire.