How Far Off is the Stock Speedometer
Senior Member
Back Marker
Joined: Sep 2007
Posts: 153
From: Vancouver, WA
I was doing 60mph on the VTR's speedometer along a flat straightaway, and I think I read about 56mph I using my Garmin eTrex Legend GPS with WAAS enabled while reading an accuracy of ~20-40' or so. This was over a year ago when I did this test, so I'm going off of memory. I use stock final drive gearing (16/41).
Senior Member
SuperBike
Joined: Aug 2005
Posts: 1,864
From: Fort Wayne, IN
Here is the thread that I started with my data:
https://www.superhawkforum.com/forum...ad.php?t=14881
Pretty much I just subtract 5mph from the indicated speed (in 6th gear) to get my actual.
https://www.superhawkforum.com/forum...ad.php?t=14881
Pretty much I just subtract 5mph from the indicated speed (in 6th gear) to get my actual.
Senior Member
SuperSport
Joined: Nov 2007
Posts: 758
it sounds like your is as far off as mine used to be, which was a ridiculous 12.5%. i just bought a speedohealer and now its all better. also, i checked my speed with a garmin 60csx. now its even right on with the radar deals that cops put on the side of the road.
Senior Member
SuperBike
Joined: Aug 2005
Posts: 1,864
From: Fort Wayne, IN
Yeah, doing a search and getting something useful is sometimes tough.
The problem I have with a speedohealer is that it adjusts the signal coming into the gauges. If you read my post ^^^ you'll see that I observed that while the speed reading was incorrect the odometer was dead-on. After 100 miles I cannot tell any error (using interstate mile markers). Running a speedohealer will throw it off. I suppose most people won't care because that way their bike won't rack up as many miles, but I'd rather not.
The problem I have with a speedohealer is that it adjusts the signal coming into the gauges. If you read my post ^^^ you'll see that I observed that while the speed reading was incorrect the odometer was dead-on. After 100 miles I cannot tell any error (using interstate mile markers). Running a speedohealer will throw it off. I suppose most people won't care because that way their bike won't rack up as many miles, but I'd rather not.
Member
Squid
Joined: Jun 2009
Posts: 75
From: Denver
A good alternative to the tiny and inaccurate numbers of the stock speedo, is a bicycle speedo. You can get one with a nice large digital readout, and calibration is a snap. Much cheaper than the speedohealer, which still requires reading the tiny numbers.
Sigma is a popular model, and you can even find a light for one. You can get elegant about mounting it, or you can go the functional route. I used the stock Sigma o-ring mount around the clutch lever hydraulic fitting, a hose clamp for the sensor mount to the fork, and tiny powerful Radioshack magnets simply placed in a disk carrier bolt hole. Fast and easy, works fine, if you can stand the **** guys criticizing you for not doing it "right".
Here's a thread:
https://www.superhawkforum.com/forum...le+speedometer
And a picture (you can adjust it to do MPH, of course, and the bottom line has a number of options):
Available at:
http://www.nashbar.com/bikes/Product...1_10000__11501
Sigma is a popular model, and you can even find a light for one. You can get elegant about mounting it, or you can go the functional route. I used the stock Sigma o-ring mount around the clutch lever hydraulic fitting, a hose clamp for the sensor mount to the fork, and tiny powerful Radioshack magnets simply placed in a disk carrier bolt hole. Fast and easy, works fine, if you can stand the **** guys criticizing you for not doing it "right".
Here's a thread:
https://www.superhawkforum.com/forum...le+speedometer
And a picture (you can adjust it to do MPH, of course, and the bottom line has a number of options):
Available at:
http://www.nashbar.com/bikes/Product...1_10000__11501
Last edited by Redone; Jun 29, 2009 at 10:26 AM.
2nd mouse gets the cheese
SuperBike
Joined: Jan 2008
Posts: 1,697
From: Beaverton, OR
Yeah, doing a search and getting something useful is sometimes tough.
The problem I have with a speedohealer is that it adjusts the signal coming into the gauges. If you read my post ^^^ you'll see that I observed that while the speed reading was incorrect the odometer was dead-on. After 100 miles I cannot tell any error (using interstate mile markers). Running a speedohealer will throw it off. I suppose most people won't care because that way their bike won't rack up as many miles, but I'd rather not.
The problem I have with a speedohealer is that it adjusts the signal coming into the gauges. If you read my post ^^^ you'll see that I observed that while the speed reading was incorrect the odometer was dead-on. After 100 miles I cannot tell any error (using interstate mile markers). Running a speedohealer will throw it off. I suppose most people won't care because that way their bike won't rack up as many miles, but I'd rather not.
Senior Member
SuperBike
Joined: Aug 2005
Posts: 1,864
From: Fort Wayne, IN
Yeah, that's pretty much the consensus I've seen from those who have discussed it (to death). Honda obviously knows what they are doing, and making a speedometer read the correct number shouldn't be that tough. I think they hedge their bets based on various production tolderances, etc. You'd think they would just be able to calibrate that thing to dial it right in.... but what do I know.....[answer: nothing]
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World Champion
Joined: Dec 2004
Posts: 105,287
From: Fulton, MO
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