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Old 12-28-2010, 11:20 AM   #1
loosenoose
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mental speedo healer

when i got my vfr, the guy told me that the sprockets were -1 in the front and +2 in the back (i think it was) and it seems like if im going the posted speed limit i am the slowest on the road. i know my speedo is off now. does anyone know a formula for calculating the correct speed, or a program or online too to do the math for me?
i dont like being passed so much, but dont feel comfortable with just winging it and not having a clue how fast i am going. like 90% of my riding is done during the dark hours this time of the year, so i dont know who the cops are and who isnt. i just slow down when i see any headlights.
i get paranoid.

edit: also, my budget at present does not permit me to buy a speedo healer.


tldr: my sprockets are not the stock size. -1, +2. if the speed limit is 60, how fast should i be going, by my speedo, to be doing an actual 60?
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Old 12-28-2010, 11:26 AM   #2
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http://www.healtech-electronics.com/

Says -15.2% off

I would guess its about 10% myself
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Old 12-28-2010, 11:28 AM   #3
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Just pace a car in the next lane and look at his speedo.....and hope he doesnt try and grab your lane.....lol

Im know theres a way to calculate it if your sure you know what sprockets you have.....I just dont know it.
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Old 12-28-2010, 11:29 AM   #4
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Get someone in a newer model vehicle (maybe with a digital gauge) to follow you along the road at 40, 50, 60, 70 mph. Jot it down and do the math.
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Old 12-28-2010, 11:30 AM   #5
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You can plug the numbers in on the Speedo Healer site, or if you know the tooth count on the sprockets and rear tire size, I can get a quick approx number for you.
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Old 12-28-2010, 11:32 AM   #6
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Quote:
Originally Posted by bluewave18 View Post
http://www.healtech-electronics.com/

Says -15.2% off

I would guess its about 10% myself
Think I did it right.
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Old 12-28-2010, 11:33 AM   #7
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Quote:
Originally Posted by bluewave18 View Post
Think I did it right.
Prob so.. but I don't know his stock gear ratio and tire size so
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Old 12-28-2010, 11:34 AM   #8
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I guessed those based on what the site said was stock
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Old 12-28-2010, 11:38 AM   #9
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I will tell you what made me finally buy a speedohealer. I procrastinated because it does not make more power.

A cop pulled me over for 8 over. I told him I couldn't tell due to my speedo being off. We got to BSing about the bike. I told him I could pay a ticket for 120 or buy the part to fix it. He offered me a deal. If I promised to fix it he would let me off. I swore I would buy one and rode off. I ordered one that day.
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Old 12-28-2010, 11:40 AM   #10
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OK, looked it up

stock is 16/43
stock rear tire is a 170

So if it's all stock but the gearing, and correcting for factory speedo error, it is now

-15.1% (reading slower)

if he's running a 180/55 it's -11.1%
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Old 12-28-2010, 01:26 PM   #11
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Quote:
Originally Posted by bluewave18 View Post
I will tell you what made me finally buy a speedohealer. I procrastinated because it does not make more power.

A cop pulled me over for 8 over. I told him I couldn't tell due to my speedo being off. We got to BSing about the bike. I told him I could pay a ticket for 120 or buy the part to fix it. He offered me a deal. If I promised to fix it he would let me off. I swore I would buy one and rode off. I ordered one that day.
just checked and they dont offer any for the 92 vfr. just 94-97 for the 750
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Old 12-28-2010, 04:50 PM   #12
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Stick a GPS on it, that will tell you your speed, pretty cheap now too.
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Old 12-28-2010, 07:42 PM   #13
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With -1+2, its AT LEAST 15% off......Remember they are usually 7-8% off from the factory, completely stock.

If your speedo is showing 60mph, you are likely going 50mph....
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Old 12-28-2010, 07:51 PM   #14
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Quote:
Originally Posted by mjrauma View Post
Stick a GPS on it, that will tell you your speed, pretty cheap now too.
Bingo... and you can borrow mine for a shift if you like.
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Old 12-28-2010, 08:53 PM   #15
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Does the VFR use a speed sensor or does it drive off the front wheel?
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Old 12-28-2010, 10:36 PM   #16
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its got a gear on the front sprocket that runs the speedo

cali, thanks for the offer. i have a tomtom, i just need to get a bike mount for it
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Old 12-29-2010, 12:59 AM   #17
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Ram Mounts has what you need.

http://www.ram-mount.com/Products/Mo...8/Default.aspx
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Old 12-29-2010, 02:20 AM   #18
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Another option if you really want to go cheap: get a bicycle speedometer. Yes, you heard me right. Attaching's a breeze: glue the magnet to your front wheel, the sensor on your fork (or nearby), run the wire through the fairing and find a spot to place the li'l screen (velcro recommended). Pop a battery in it (they usually come with one) and program in your tire size. BTW the magnet usually comes in a small plastic case about the size of an almond; you can pop it out for minimal unbalancing effect to your tire (not that it's big enough to have any effect anyway) - the magnet itself will usually be a small bar roughly 1mm x 3mm.

PROS:
- They're cheap starting price around $25-30

- They're available Any bicycle store will have them for sure, and probably most other places with sporting accessory departments

- Easy We're talking 10 mins tops to install. If you're old enough to sprout hair down there, you've probably got the mental capacity to do it right the first time. There's no need to connect to the bike's battery or splice into any wiring, no holes to drill or anything to take apart.

- They're accurate up to 99 or 199 mph depending on how many digits they put on the screen.

- They gots goodies You can get "bonuses" like average speed, trip distance and other goodies.

CONS:
- Battery Standard size button cell, should easily last 3-6 months even with heavy use. But yeah it will have to be replaced a couple times a year. Whoop-di-do.

Shut-off Most will shut off automatically after about 1 minute when you're sitting still. Some extras like average speed might reset after a longer period like an hour. Surely you shouldn't need to check your speed when sitting at a light though, right?
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Old 12-29-2010, 09:04 AM   #19
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that actually sounds really cool
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Old 12-29-2010, 09:19 AM   #20
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Quote:
Originally Posted by Bart View Post
Another option if you really want to go cheap: get a bicycle speedometer. Yes, you heard me right. Attaching's a breeze: glue the magnet to your front wheel, the sensor on your fork (or nearby), run the wire through the fairing and find a spot to place the li'l screen (velcro recommended). Pop a battery in it (they usually come with one) and program in your tire size. BTW the magnet usually comes in a small plastic case about the size of an almond; you can pop it out for minimal unbalancing effect to your tire (not that it's big enough to have any effect anyway) - the magnet itself will usually be a small bar roughly 1mm x 3mm.

PROS:
- They're cheap starting price around $25-30

- They're available Any bicycle store will have them for sure, and probably most other places with sporting accessory departments

- Easy We're talking 10 mins tops to install. If you're old enough to sprout hair down there, you've probably got the mental capacity to do it right the first time. There's no need to connect to the bike's battery or splice into any wiring, no holes to drill or anything to take apart.

- They're accurate up to 99 or 199 mph depending on how many digits they put on the screen.

- They gots goodies You can get "bonuses" like average speed, trip distance and other goodies.

CONS:
- Battery Standard size button cell, should easily last 3-6 months even with heavy use. But yeah it will have to be replaced a couple times a year. Whoop-di-do.

Shut-off Most will shut off automatically after about 1 minute when you're sitting still. Some extras like average speed might reset after a longer period like an hour. Surely you shouldn't need to check your speed when sitting at a light though, right?
Had a setup like that on my old GPZ 1100. Pretty accurate too. Just measure to the center of the axle with bike upright and that will give you the radius of your tire. Forgot all about that till Bart mentioned it.
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