Why does a front wheel speedo equal accuracy?
Putting his hands in the air, like he just doesn't care.
Check out my eBay store!
Dave - Motorace - Michelin
Originally posted by Karaya One
Why does a front wheel speedo equal accuracy?
Did you grit your teeth and try to look like Clint Fuckin' Eastwood?
Or did you lisp it all hangfisted like a fuckin' flower?
"you won't xplain the circumstances"??
What? I bet you were trying to run from the cop in RedRider's post...
www.elementsofbalancemt.com
www.facebook.com/misstwisties
"If you don't stand for something you fall for everything."
"Speak when you are angry and you will make the best speech you will ever regret."
I thought Rye had put an aftermarket instrument cluster on his ZX-79 that had an accurate speedo.
You can have a front wheel sensor and still dial in 5% high readings.
Ben
Get it on a GPS unit then tell us how stupid you are.
Originally posted by mycirus
Get it on a GPS unit then tell us how stupid you are.
Bwaaaaaa haaaaaaa haaaaaa!!! Haaaaaaa haaaaaa!!!
Did you grit your teeth and try to look like Clint Fuckin' Eastwood?
Or did you lisp it all hangfisted like a fuckin' flower?
Squid, start riding up in NH more, we need guys like you to draw more of the fire away from us and that'll make our 80 mph runs seem like granny speed!!
A. ...But I can go to jail for that!!
Q. For what? Being f*ckin' awesome?!
Dammit, I forgot!!
A. ...But I can go to jail for that!!
Q. For what? Being f*ckin' awesome?!
Congrads on your run of a lifetime.
No weaving in and out of traffic now..............
Since your too far away.... I can calibrate your speedo(s) with several radar guns....
-Suf Daddy
Originally posted by mycirus
Get it on a GPS unit then tell us how stupid you are.
Suf Daddy.
Originally posted by Mystery Squid
btw (for the hata's) , I was wearing shorts/t-shirt, and had the Ipod blasting in my helmet....
I kid you not...
Originally Posted by ThisBitch
You seem to take great pride in this....oh well. Don't come crying when you have no more skin.Originally posted by Mystery Squid
btw (for the hata's
I kid you not...
www.elementsofbalancemt.com
www.facebook.com/misstwisties
"If you don't stand for something you fall for everything."
"Speak when you are angry and you will make the best speech you will ever regret."
Oh he's just fishing for drama againOriginally posted by MissTwisties
You seem to take great pride in this....oh well. Don't come crying when you have no more skin.
Hee Haw
Jason LaCroix
'02 Honda VTR1000F
IBA #19722
Hi my name is Joe.. I live in a can and I eat skunks for breakfast.Originally posted by Mystery Squid
btw (for the hata's
I kid you not...
What were you listening to on the iPod?
"Highway to the Danger Zone" or something of that sort?
Ben
At low speed, yeah. At 160.......nope.Originally posted by Mystery Squid
Nope, no running from the cops.
and the speedo's on the 7R's are accurate.... Rye? zx7rou812?
'95 ZX7/9
'02 XR650R
'78 KZ1000
All of my bikes have run 5-10% optimistic on the speedo. But, even at 10% optimistic 160 indicated is still pretty darn quick.
Jason LaCroix
'02 Honda VTR1000F
IBA #19722
I think it might be a way to keep people's speeds down. Like 'wow, I'm doing 100mph, that'll be good enough' and it really is 'only' 90 or some such silliness..Originally posted by Mystery Squid
w3rd...
WTF, we put a man on the moon almost 40 years ago, yet we can't get accurate speedo's on bikes....
That is the only thing that makes any sense to me. FWIW, my VTR's speedo runs almost exactly 10% optimistic, but the odometer is almost spot-on and may even slightly under-represent how many miles I've gone. Weirdness...
Jason LaCroix
'02 Honda VTR1000F
IBA #19722
I've seen a lot of speculation that they are designed to read high on purpose, so the manufacturer doesn't have to deal with people contesting tickets saying that the speedo was reading low.
Better to err on the side of reading high, then the ones that read low end up accurate as opposed to reading low.
Also the fudge factor helps deal with people changing tires, etc.. which can effect the speedo.
Ben
could you use "your honor, my speedo is off by 5-10%" excuse?
"fuckit!"
It has nothing to do with difficulty in creating an accurate mechanism.
It is just this.. (again this is all speculative)
They know sportbikers do things like change tires (screws with speed), change gearing (screws with speedo), etc..
The 8-10% high error would cause mods which lower the speedo reading to still keep the speedo reading high.
ISTR riding next to Rye last winter (with you) and he had said we were doing 95 on the highway. I was flipping as the VFR was showing insanely high at like 110mph or something.
Ben
As Ben pointed out, any inaccuracy in the speeod will be a linear inaccuracy. Your speedometer has some way to measure the number of rotations of the wheel, and multiplies that by a fixed constant to either generate a magnetic field to move a needle, or generate a voltage or current for a digital speedometer. Either way, the equation will be something like (# of rotations per second) * (Gain) = (Voltage/Current/Magnetic field), a linear equation. So if gain is 5% higher than it should be, you'll read 5% higher at all speeds. At 35you'll read 1.05*35= 36.75 mph, at 120 you'll read 120*1.05 = 126. The speedo may appear more inaccurate at higher speeds because the inaccuracy in terms of mph will be greater, but the inaccuracy in terms of the percentage of speed remains the same.Originally posted by Mystery Squid
I don't know if I buy the "for your safety" theory, because does it really matter if you're going 90 vs. 100? At the very least, it's known that the 7R speedo is accurate up at least until about 90ish....
Yep, in fact for most systems you should be able to recalibrate it in one of two spots. Either adjust the sending unit, the unit that records the rotation of the wheel and translates it into a electrical signal, or adjust the display unit which takes that electrical signal and translates it into a user-readable form (needle, number, whatever).Originally posted by Mystery Squid
I would further imagine that by changing this gear (or wherever the "factor" is implemented) to one of the proper factor would yield an accurate speedo...
Or like you said, a black box type device which sits between the sender and the display which applies a second gain factor to the sender signal to adjust for it's inaccuracy. Most speedo correction systems seem to take this approach, as it doesn't require permanently altering the bike's speedometer.
my thinking on this, as regards the ole fashioned, front-wheel driven speedos, is that the manufacturers just pick a gear ratio that's convenient & close to the actual ratio... based on manufacturing concerns, longevity, original tire diameter fully inflated, etc... then err on the side of caution (up) for reasons stated before.
I think that the reason they didn't strive for pinpoint accuracy was simple: $$$.
'course, as your front tire wears, the speedo's gonna be off progressively, anyway...
WWSD? (what would Sneakers do?)
"for every credibility gap, there is a gullibility fill"
jeff f
'97 RF900R
i got a problem with my 10r too. a finger snap twist of the right bar will bring it to 100.
"fuckit!"
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