Originally Posted by VN750Rider/Jerry
Don't understand the sock thing, but yes the Vulcan 750 is highly optimistic. I don't have an issue with it now that I know about it. The fact is, I have never seen ANY vehicle that didn't have an optimistic speedometer. I have had cars and trucks that I put oversized rear tires on (speedometer was driven off the transmission) which corrected the speedometer error. I just make it a point to ride 5 mph faster than the speed limit, or in some cases, on interstate highways, as much as 15 mph above the posted speed limit. That's what it takes to keep up with left lane traffic around here. I have had my Vulcan up to 110 mph by GPS, it won't seem to go any faster, though I've heard of people getting 120+ out of them. Jerry.
I am a big guy at ~#300 and have a full size windshield on my 750, and have had it up to 150 km/hr on the speedo, which I now know was probably more like 140km/hr, (87 mph). I had more throttle, but ran out of nerve.
I just did some calculations last week, which I posted on a thread here, which indicate that the gearing on the Canandian and American bikes will yield ~14.5 mph in 5th gear, per 1,000 rpm.
So at 7K rpm, your speed is ~101.5 mph.
7,600 rpm yields ~ 110 mph. I think speeds higher than this with a large windshield or a rider much bigger than a jockey, are not going to be easy to acheive. You are past the torque and horse power curve peaks, and that last 900 rpm is going to be hard won.
Our redline is 8,500 rpm, which would theoretically yield 123.25 mph.