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buddy of mine was directly behind me on the high way on his 2008 cbr 1000rr and i was flickering between 102/103 mph and he said he was doing 115 ? and one have any input on this maybe a way to calibrate ?
 

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Thats strange, my speed is usually spot on, ive driven past several radar devices on the highway at various speeds, the biggest difference ive noticed is 2mph
 

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I've hit countless radar monitoring signs (30-40 of 'em) in the SoCal canyons and all have been spot on, when they do actually register me, that is. I find in a crouched position we're invisible :) (( DO NOT TRY THIS ON A COP, They can aim their radar gun, those signs can't))
 

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Discussion Starter #5
Thats strange, my speed is usually spot on, ive driven past several radar devices on the highway at various speeds, the biggest difference ive noticed is 2mph
i did a few radars yesterday its seeming that in lower speeds its maybe 3-5 off but upwords of 90+ its off close too 10 maybe more tested with a few different bikes all giving the same reading 10-15 mph off , speedo healer maybe ?
 

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Speedo Error

My speedometer reads spot on up to about 40 mph, then reads high by only 1 mph from there up to about 60 mph and 2 mph from there up to 75 mph, as tested against 5 different roadside radars.
 

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Just verified my R3 speedo on the way to work via my Garmin. Completely stock - I am no more than 1 MPH off at any given speed/gear. Most of the time I was within .5 MPH.

Speedo Read 25 - Garmin flickered between 24 & 25
Speedo Read 45 - Garmin flickered between 44 & 45
Speedo Read 50 - Garmin flickered between 49 & 50
Speedo Read 70 - Garmin flickered between 69 & 70

This is the most accurate speedo I have ever seen from the factory.
 

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buddy of mine was directly behind me on the high way on his 2008 cbr 1000rr and i was flickering between 102/103 mph and he said he was doing 115 ? and one have any input on this maybe a way to calibrate ?
That's because his was off, yours was right.
 

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My speedometer reads spot on up to about 40 mph, then reads high by only 1 mph from there up to about 60 mph and 2 mph from there up to 75 mph, as tested against 5 different roadside radars.
You have to remember that if a roadside radar isn't hitting you directly in front there is a cosign error that will make it read slow. Since most are off to your right at some angle, most read slow by a MPH or so.
 

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You have to remember that if a roadside radar isn't hitting you directly in front there is a cosign error that will make it read slow. Since most are off to your right at some angle, most read slow by a MPH or so.
Yes, but that's still WAY more accurate than any other bike I've owned. They've usually been off by about 5-7 mph.
 

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Oh no, definitely still very accurate. My Majesty is 5mph off at anything above 35 or so and 7 or 8mph off at 70. Oh definitely VERY accurate if that's the case. I haven't done mine but just watching car behavior around me it's gotta be close. On a 2 lane on my Majesty if I didn't do an indicated 60 I was getting pushed. I did 55 Saturday and kept the same distance from the truck behind me.
 

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Either a GPS, or just download an app on the phone.
Android and iPhone, and even Windows have plenty of GPS apps, that may be slow to show you the speed (like take 1 to 2 seconds), but they will give you accurate results!

The faster you go, the more accurate your speed will read.
So at 100MPH, having a 1% deviation in speed might show on the speedo, while at 10MPH it might not show.

My recommendation is to tape your phone on the handlebar or windshield, go about 80MPH on an empty highway, maintain speed for a few tens of seconds, and compare speeds; and you're way more accurate than roadside radars.
 

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The R3 has only been in Australia for a week. My brand new one showed the following against a GPS.
Actual(GPS) = 60 kph, speedo = 65 kph, Actual 80kph speedo 88kph. Distance recorded was accurate, GPS = 111.2 km, odometer = 112.8km (close enough). Australian design rules follow Eu ones which state: Can read up to 10% over PLUS 8kph, So, a genuine 100kph could have an indicated reading of 100 + 10% + 8kph = 120kph OUCH!!! A 20% error.
Now, I could change the front sprocket (it probably needs longer legs anyway) but then the odo would be out.
Has anyone found out if the speedo can be adjusted?
 

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Further to my speedo post. No luck with Yamaha or the dealer so far.
The speedo on my R3 gets its signal from the ABS disk on the rear wheel, so sprocket changes will have no effect. (does the US version have ABS?)
I have fitted a push bike speedo without any non reversible mods to the bike. Some only read to 99 and not 999 so are useless on a motor cycle. I have used a CatEye Velo 7, cable tied to a piece of perspex which is in turn cable tied to the handle bar casting. The sensor is a magnet which I have mounted on a short piece of wire (piece of bike spoke bent to suit) fixed to the front wheel bearing hub with a hose clamp.
I have set it to about 1% high off the GPS and there is a very wide range of speedo adjustment available, so it is workable with both metric and imperial speeds.
I have also fitted an E-Trex GPS mount to the same piece of perspex.
I can post photos if anyone is interested.
 

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This has been the most accurate bike I've had so far.
At speedo indicated 115mph
GPS showed 113.7mph pretty darn good in my book.
 

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I have an Canadian bike (no ABS) and my bike reads 12-15% high. Are you guys with really accurate speedometers have ABS bikes or is mine just because it was a 'first off the boat' edition?
 
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