I'm still very pleased with the 17t sprocket. Can anyone tell me what the smallest rear sprocket that fits the GS ?

After many miles with a GPS on top of my tank bag, 8%-10% over is the average for the speedo, and the odometer is right on the money (mine anyway) I have a 17T and during ideal conditions I have achieved 69.8 Mpg, that was gas station to gas station, open road. 16T if no freeway, 15T intown only, 17T just right....remember you do have a 6 speed tranny 

I rarely dare to disagree with Sledge, but the speedo having a positive error is intentional by the manufacturer for whatever reason, not anything to do with beng an economy unit.  Judged on basis of consistency and linearity they are quite good and paying more could not produce an appreciably better accuracy in that regard.  The same 5 to 10 percent error is present on most bikes, the Goldwing included, until Honda was taken to task in a class action.  Now the GL1800 is calibrated to read true in 2009 and 2010 models.  I run an aftermarket electronic calibration unit on my 2002 model and it is spot on gps.  The Gs500 is mechanical, so short of aftermarket gear sets or taller front wheel the problem is chronic.  The bike computer is sweet though.

prs

Quote from: Homer on June 19, 2010, 10:49:02 AM
The housing's too small for an 18t.

Not on ours...

The hardest part was finding someone who would get one. Half the places we asked said it wasn't even available. Made by AFAM. Ordered from Bayside Performance. 

... all other things being equal.

Well I dont know what all the fuss about the 15t. I used to run a 13t and stock rear and still hit 98mph on the freeway how much faster do you need to go? I used all the rpms when shifting and had no issues going over the speed limit. and giving more low rpm torque I could throttle wheelies from time to time if done correctly and using the clutch all the time..