tire change= speedo way off.
 

I switched from the stock 402's to some commanderII both being the same size. 130/90/b16. now my speedo is off by 10 mphs in 5 gear, less at lower speeds. Before the switch my speedo was right on the money.

so heres whats got me scratching my head, if I got new tires with more tread then what I had, wouldn't it cause my speedo to read lower then what it really is? so what the heck is going on? can I reset my speedo? its the first year of the lcd display. I did search but all the post are about the speedo going the other way.

thanks

I'm mean it's reading 10 mph then I'm really going.

How can you tell that your going faster than the speedo says?

What makes you think your 10 mph off. Unless you have access to a radar and someone to clock you as you go by, (or some other method of measurment) you have no idea what speed your actually going.

The difference in a few millimeters tread from worn down tires and new tires of the same size is hardley enough to make a 10 mph difference in speed in either direction. Let alone any difference you could tell by just riding the bike.

Kinda like saying that synthetic made your bike run at lower RPM's. Not gonna happen......

There is a school near me that has a radar gun for your own info that tells you your speed when you should be doing 20mph. This is how I check my speedometer.

Cause those things are always accurate. They've got some going out highway #1 east from my city. I've blown past them at 150 km/h and it says I'm only going 116

Kinda like saying that synthetic made your bike run at lower RPM's.
http://www.free-coupon-codes.info/lol/ap.jpg
http://www.free-coupon-codes.info/non/or.jpg

Well it says I'm going faster then I really am by 10 Mphs. Checked against my gps which it's always been inline with. Have had a buddy pace me and I've checked it with mile markers.

I'm thinking that the commanders II are a smaller diameter then the 402s. The bikes carb'd so I don't have a programmer. How can I fix it?

There's a product named speedohealer that you can adjust your speedometer to a true setting using a gps...I had it on my '04 Kawi Z1000 when I changed the gearing to give an accurate reading.

I don't know if works for HDs though.

here's a link that U can punch in the dia of both tire to see the diff..

http://wildcatent.freeyellow.com/zookmods/calc.htm


I don't see how such a small change would make that much speed diff.

I cant find the Michelin's specs but when I ordered them for my Heritage they were
within an 1/8 in of the HD Lops and that little diff won't make anywhere near 10 mph diff on the speedo...








.

That's why I'm so confused. I couldn't find the commanders tire spec either but nothing else changed. Expect the belt tenision.

At one time I did have a link that I saved that showed the New Mits CommanderII's specs..

I looked for it but I must have lost it when I got a new puter last month..

As I said I remember that the Mits are really close in dia as the Lops were.
I remember that cause I almost ordered some Elite 3's and they where about 9/16'' taller.
So the New commander II's being almost the same size is why I ordered them.


GOT it....... finally...... it took at while but I wasn't giving up till I found it again.....

Scroll down to Page 10 in the link below and it gives the static and In use tire Dia for the Commanders II's


Ur new Commander II's 130 90-16 is - 25.2 static, and 25.8 after install and aired up...
Ur old Lops 130-90-16 are 25.7 aired up...

So With only 1/10'' difference, U've got other issues or Ur speedo wasn't right with the Lops on there either..

http://www.michelinmotorcycle.com/pubs/fitment2012.pdf





.

We have lots of those in Los Angeles and rarely are two the same. I can drive by two on one block and get two different speeds. The moral of the story is not to trust the speed on those. If you want to check your speed accurately get a gps and check via that.

The GPS is what made me notice the speedo was off.

What should I be looking at to test/fix since it was just fine before the tire.

here is what you need to fix the problem:

http://www.dakotadigital.com/index.c...rod/prd238.htm

Thats a pretty good little fixer-upper..




.

Having run many different brands on my bike I can tell you it's not the tires.

Something else threw your calibrations off.

That's what I'm thinking also. What should I be looking at? I don't want to throw parts at something just to mask the problem. I'd rather fix it right the first time since it was accurate before.