How Far Off is the Stock Speedometer
 

while riding on the highway the other day i was doing 80 mph and keeping pace with other cars?

so i just wanted to know how far off it actually was?

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).

8% average...or about as far as it takes to reach the search button! :mrgreen:

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.

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.

thanks guys and i did do a search and nothing came up

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.

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 anal 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):

https://www.superhawkforum.com/forum...&pictureid=804
Available at:

http://www.nashbar.com/bikes/Product...1_10000__11501

did I??

Who's on first?

+1 I noticed the same thing regarding the odometer and stock gearing. Its like honda did it on purpose to try and slow us down.

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]

https://www.superhawkforum.com/forum...earchid=370543

:horse:

search
 

+1:search:

I have a speedohealer installed (stock gearing) and at exactly 4K RPM in top gear speedo reads exactly 70mph. Just a general benchmark.

At 40mph on a stock truck, I was showing 42mph. At 60, I showed 63. So about 5%. Nothing to get you a ticket.

With a 16/43 ratio I set my speedohealer at -6%. It's probably still 2-3 mph above the actual speed, but I rather play safe.