Help needed recalibrating speedo

# Thread: Help needed recalibrating speedo

1. ## Help needed recalibrating speedo

Here's the scoop: Speedohealer installed today to fix speedometer/odometer errors caused by new 15 tooth front sprocket. Now I have to program the sucker to "heal my speedo", but how much healing does it need?

Yes, I can do the math (ie. wheel/tire circumference, sprocket diameter, etc.) but the result of that computation is theoretical and error-prone (eg. my bad measurements). I'd much rather do the simpler and more accurate math: compare actual speed to displayed speed.

But... how can I measure how fast I'm really going? That's where I need your help.

I need someone with a GPS -- then I can get an accurate read on my speed. I figure we could ride side by side and make a note of speeds, then do the math on the roadside.

So, can anyone with a GPS (Or radar? Or laser? Or ???) in the lower mainland give me a hand?

Or if you have already installed a Speedohealer or Yellow Box, how did you get your callibration measurements?

2.

3. I know someone with a GPS... PM me.

4. I got a gps. All we have to go is find a long stretch of road, and you pace me while I keep the bike at a previously agreed upon speed.

You note your speedo reading (maybe 3 or 4 samples to ensure good consistency) and then adios.

say, gps-indicated 100 kph dead even = xxx kph on your bike. Your conversion factor is trivial from that point.

5. Originally Posted by johan
I got a gps. All we have to go is find a long stretch of road, and you pace me while I keep the bike at a previously agreed upon speed.

You note your speedo reading (maybe 3 or 4 samples to ensure good consistency) and then adios.

say, gps-indicated 100 kph dead even = xxx kph on your bike. Your conversion factor is trivial from that point.
Zigactly!

6. Hey Johan,

Just give it to Gord & he can throw it in his tank bag & get the speed himself... easier that way (that's the way I was going to do it).

7. Look on the highway. Lots of places have measured kilometer posts. You can use the distance to check your error and compensate til it's right.

Crotch

8. Go on the speedohealer web site and use the online calculator. I found it to be accurate.

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