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post #1 of 11 (permalink) Old 08-30-2010, 11:30 AM Thread Starter
Dave
 
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Speedometer off

Well I found the first thing about my bike that annoys me a little.

Suction cupped my GPS on the tank Sat. when wife and I were going on a new adventure back roads ride. (Yeah I only turn it on when I really don't know where I am or I'm getting hungry....)

Turns out it says my speedo is reading 5-6 MPH fast. My front tire has plenty of tread as I borrowed my neighbors tire tread gauge and I am well in the green on it.

Oh well, could be something worst. I wonder if when I do replace the front tire someday a larger outside diameter tire would work to get it closer? Or am I

Thoughts?

dave

Oh yeah, it was a great ride, weather perfect, I do love this bike!
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post #2 of 11 (permalink) Old 08-30-2010, 12:20 PM
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I think they are all off. A bigger tire gets it closer but not right on. I believe that the odometer is right though.

02 honda sabre 1100
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post #3 of 11 (permalink) Old 08-30-2010, 01:07 PM Thread Starter
Dave
 
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Yeah Niterider, That also crossed my mind,is the mileage also gonna be off?

Thanks,
Dave
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post #4 of 11 (permalink) Old 08-30-2010, 01:15 PM
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I put the larger 110 tire on mine. Using the crude method of travelling a consistent 60 mph and timing how long it takes to go from one mile marker to the next, my speedo is pretty accurate (at least at 60 mph). The odometer under reads the mile posts by about 80 yards or so.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #5 of 11 (permalink) Old 08-30-2010, 04:36 PM
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IIRC the 100/90-19 front tire makes the speedo read about 10% high, which is close to your observed 5-6 mph over, (if you are traveling 50-60 mph).
The odometer (mileage) only reads about 1.7% high though.

Changing out for a larger 110/90-19 front tire almost corrects the speedo, but causes the odometer to read a bit low.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 08-30-2010 at 05:15 PM.
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post #6 of 11 (permalink) Old 08-30-2010, 04:54 PM Thread Starter
Dave
 
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Thanks guys! This site is so great!

Everybody going with the Metzeler tires on the front too? Or?

dave
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post #7 of 11 (permalink) Old 08-30-2010, 07:30 PM
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I also wouldn't put too much stock in the GPS being accurate either. Mine tells me to turn about 200 feet before i get to the road, so they are not dead on.

01' VN750
Jardine cross over exaust
Kyriakin grips and foot pegs
Modified seat and backrest
Windshield
Luggage rack
Crash bar with Kyriakin pegs and extensions
Kumho 758 165/80-15 CT rear Dunlop 404 110/90-19 front
Coastered and air/fuel screws at 2.5 turns
Spline lube

93' VN750 getting TLC
Decals and mirrors
Coastered and air/fuel screws at 2.5 turns
ACCTs to MCCTs
Degoated with Harley mufflers
Duro 110-90-19 front 150-90-15 rear
Pick-up coils at .020
Spline lube
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post #8 of 11 (permalink) Old 08-30-2010, 09:09 PM
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Lots of folks brag on the Metzlers. I'm perfectly happy with Pirelli MT66 tires. Have 11,000 miles on 'em and gonna get a few more from the rear and many more up front.

I'm keepin' all the left over parts. I'm gonna use 'em to build another bike!
_____________________________________________
"Black Beauty"
1989 VN750 acquired December, 2008, 6,711 miles
Currently 23,298 miles

Old Blue
2001 Honda CMX250 Rebel acquired July, 2008

1987 VN750 project bike, acquired August, 2009, 33,000 miles and balancer sticking out of the case, currently awaiting attention and parts
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post #9 of 11 (permalink) Old 08-30-2010, 10:29 PM
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10% is the number I get, by riding past radar trailers and by timed measured miles, and if it has to have an error, I really like that error. Can't beat moving the decimal point and adding...

If I want to ride 55, I ride so the speedometer reads 55 + 5.5 = 60.5.
If I want to ride 60, I ride so the speedometer reads 60 + 6.0 = 66.0.
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post #10 of 11 (permalink) Old 08-31-2010, 10:06 AM Thread Starter
Dave
 
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Yeah IMboring, I did just that.

I fly a number of different aircraft and I don't think any of them have an accurate airspeed indicator. I had a two place Pitts Special for 26 years and the two airspeed indicators in it read about 6 mph different, and the air came in the same tube.

It like the old saying, a man with a watch knows what time it is. A man with two watches is not quite sure.....

Thanks,
dave
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