I have the stock 19" tire. I'm okay with things and was really just wondering about the final drive but I will check the odometer just to know. My rpms at an actual speed of 70 mimic the '83 1100GK and my manual says I have a .961 5th gear so that with a 3.09 final should explain things. It's cool, I'm done obsessing.
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rpms at 70mph
- Thread starter 1948man
- Start date
Steve
GS Whisperer
Well, ..., yes and no. The odometer is strictly gear-driven off the cable coming up from the wheel and the speedometer is driven off of that. In fact, it is possible for the speedometer to break and the odometer still works. If you change the front tire size, you will affect the accuracy of both, the odometer and the speedometer. Following your line of thought reinforces that. A larger tire will slow down the speedometer, therefore, it also slows down the odometer.
Unfortunately, the odometer starts out reasonably accurate, while the speedometer is rather optimistic. By changing to a larger tire to slow down the cable, you also change the odometer to a lower reading. The change is only in the 3-5% range and most of us are not too worried about violating any warranties, so it's not much of a problem. However, we do have to worry about maintaining a proper (legal) speed every time we ride, so I feel that speedometer accuracy trumps odometer accuracy.
Just in case you like numbers as much as I do, on a trip a few years ago my wife's bike and my Wing went everywhere together. One bike did not even do an extra trip down a driveway unless the other one went, too. The GPS trip meter was also on for every inch of the trip. My Wing odometer showed that we traveled 1193 miles. Her bike showed 1184 miles. The GPS showed 1175 miles. 1.53% error for my bike, 0.76% for hers. Speedo accuracy: at an indicated 70 mph on my Wing, the GPS shows about 70.5. Her bike shows 68.7. Not sure I would want them any closer than that.
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