Squidly Activity Post # 3 - Saw 160mph on the 7R...

[RandyO]

Originally posted by bemused

'course, as your front tire wears, the speedo's gonna be off progressively, anyway...

in the past I have taken time to recalibrate the sigma that I have on my SV occasionally as my tires have worn

and I have learned quite a bit

(stock front tire size 120/60-17)
speedo error with the stock MeZ4 tires
3-4% new to 6-7% worn
Dunlop D205
6-7% new 11-12% worn
Pirelli MTR60 (120/70)
+1% new -2% worn
Avon Azaro
3-4% new 5-6% worn
Avon Distanzia (120/20)
+3% new 0-1% worn

[Stoneman]

Leave it to Randy to apply logic, reason and science...

[RedRider]

I'm also understanding that centrifugal force plays a role on tire expansion, and thus helps to compensate some for the speedo error.

So even though the basic speedo error will multiply with increased speed, the expansion factor will work against this margin of error to some degree.

At greater speed the outside diameter of the tire grows taller by applying more rotational force. This change in overall diameter and circumference will actually work against the speedo reading higher than actual, by increasing the distance the bike travels for each complete rotation of the wheel. The expansion may not be large enough to keep the speed reading constant, but it certainly helps to balance for some of the increase in indicated speedometer speed.

http://www3.mtco.com/bry/SpeedoError/CalcSpeed.htm

Old Tire Diameter: 17 in
New Tire Diameter: 17.5 in (Expanded Tire at Speed)
Indicated Speed: 60 (MPH)

Actual Speed: 61.764705882352935 (MPH)

The rigidity of a tire can also have an effect on the amount of expansion that occurs and thus the delta between actual and indicated speeds. Just something to think about.

[RSVMILLE661]

Originally posted by Mystery Squid
Hi, my name is Scotty, and I finally admit I have a problem... I fuck chickens.

Hi my name is Joe and I taught Scotty how to fuck chickens at 160mph with only a T-shirt, shorts and sunglasses on..

[wastedincome420]

Originally posted by RSVMILLE661
Hi my name is Joe and I taught Scotty how to fuck chickens at 160mph with only a T-shirt, shorts and sunglasses on..

WITH the Ipod blasting tunes in da lid

[RSVMILLE661]

vvvvvvvvrrrrrrrrrROOOOOOOOOOOOOOOOOOOOOOOOOOOO-BAKAWK-OOOOOOOOOOOOOOOOOOooooooooooooommmmmmm

bakawk.

[elaineo]

joe can i take out a life insurance policy on you? i think it would be a good investment

[RSVMILLE661]

Hows that Golden earing song go?


*We've got a thing thats called chicken love.. we've got a feather in the air.. I've got a thing thats called chicken love.. I've got a chicken velcro-ed to my tank as I do 160 mph.. I've got a thing..thats called.... chicken love.* duh duh duh duh duuuuuh du du duh...

[RSVMILLE661]

Originally posted by Mystery Squid
Oh Scotty... It's "White Lion"

Ipod's playing some forgotten tune...
Brenda Lee is beakin' me strong..
and the newsman sang his same song
OH ONE MORE-CHICKEN-FUCKIN'-GONE!!!

loud guitars kick in

.."when I get horny and I need some poultry love... Sweet feel of chicken from the col. sanders up above.. GONNA GET READY TO LOVE.".

[Rye]

Originally posted by RandyO
in the past I have taken time to recalibrate the sigma that I have on my SV occasionally as my tires have worn

and I have learned quite a bit

(stock front tire size 120/60-17)
speedo error with the stock MeZ4 tires
3-4% new to 6-7% worn
Dunlop D205
6-7% new 11-12% worn
Pirelli MTR60 (120/70)
+1% new -2% worn
Avon Azaro
3-4% new 5-6% worn
Avon Distanzia (120/20)
+3% new 0-1% worn

I haven't attempted this detailed of a check, but I do alter the cirumference input to the computer by 50-75mm or so. This way I am averaging roughly the correct mph and odo.