what up Blade runners?

I have a quick question, can someone give me a estimate on how much my speedo is off with a -1/+4 sprocket set up?

THANKS

 

16 to 18%

 

No way to figure it without knowing how far off it is stock which can be anywhere from 5% to 15% on its own.

Find a speed check sign I guess or borrow (if you don't own) a GPS.

 

If it is a US import, stock error is 5%. Honda has been doing that for years, which meets the regulatory standard from the DOT put in place in 1997 which allows no more than 5%. EU standards are different, as are UK standards. Used to work on and re-calibrate speedometers and some of the gray market imports we got were amazingly off.

Agree on testing with GPS, as tire wear also affects it.

 

Sorry but that's simply not true.

I've owned 3 RRs and over a 2 dozen other makes and manufactures and the errors are simply all over the board. Just a fact. Do a search for 'speedo error' on any forum and you'll find thousands of posts stating the same thing. IMO , 8%-10% stock is much closer to 'typical'.

That's my personal experience YMMV.

 

well i found a some what answer, i went to gear commander and found my top speed went from 170 to 146, and that sucks so i am off by at lease 25 to 30 MPH

 

If you can figure it out exactly , and want to spend the money , there are a few options out there for correcting the error.

They all run around $100-$125 or so but do allow you to get it exactly dead on. I've used them a handfull of times in the past and they all work pretty well and are relatively easy to install.

 

What I stated is true for what I stated, but guess I didn't clarify myself enough.

Brand new, from the factory, stock gearing, with a brand new tire, if it is a US spec speedometer it's no more than 5% - if the manufacturer wants it to be DOT spec'ed and sold here in the US. (Goldwings, which were manufactured here in the US, we found had the closest speeds).

So...you're going to be at least 5% off.

As I stated, it if is a Euro spec or UK spec (which DOT does allow UNECE spec and allows that spec to be used for imports), it may be different. To elaborate, not more than 10% when new (depending on the spec, there is a 10% + 4 kmh spec out there, too). As the tire wears, it can actually get up to around 6% additional error - perhaps that is what your forum posts refer to, the error as the tire wears, or errors caused by underinflation. And of course, any sprocket change will vastly affect it. Using UNECE specs, 8 - 10% on many bikes is probable, but not the 15% error when new.

I have also seen the same make and model bike, purchased in different parts of the country, with different errors.

You can certainly have huge errors "across the board" but a little questioning can explain why.

 

You can state whatever 'specs' you want.

Real life is a different story. The OP is asking about real life. You can't tell him to take 5% x whatever variable and say that is the answer cause it's not the answer.

A max of 5% error means it can be +/- minus 5%. That's a 10% variable right there.

In my experience , for whatever it's worth , the average bike is off by around 5 miles per hour at 50-60. That's 10% right there and it usually gets worse farther out. I've been running GPS on my bikes since the 90's and have speedchecked probably hundreds of bikes. As soon as anyone finds out I have GPS they want to check it out. Interestingly, I've never ran into 1 single bike that was dead on.

Either way , there's only one way to know for sure and doing some magical math ain't it.

 

You what , nevermind.

It's cool , your probably right. There's really no need to get into a debate over it.