My GPS has mine off by 3mph

 

I've never ridden any brand of motorcycle that gave an accurate speedometer reading. For that matter most cars will be off as well if you check them with a gps, they just aren't as far off. I've found most of my bikes to be reading right around 7% faster than actual speed. I don't believe there is a an actual good answer to why speedos are wrong. Some will say the manufacturer does it to keep us running slower, others say it's because the manufacturer can then give a higher top speed, and another I've heard is that it allows for a different size tire to not make your speedo incorrect in the wrong direction.

 

maybe they want the mileage warranty to expire sooner?
Or, possibly they figure if they have to have a window of error, make sure it's low and not high, so nobody will be suing HD for getting a speeding ticket when they thought they were riding legal..?

anyway, if you want to fix it, dakota digital can hook you up. or you can swap your speedo out for a marine unit that uses GPS as it's sensor....

Hogdoctor

 

Who gives a darn what the speedo says? Am I missing something?

 

My GPS is consistantly 2-3 mph faster, thru all speeds, than my bike, car, and truck, leading me to believe that all three are close enough for me.

 

Or.........the GPS is off. Bottom line is...........who gives a ***? Not me. Just jump on the bike and ride.

 

Some are accurate and some seem to be off. They have a sensor in the tranny.

 

Mine is also off by 3MPH on my 2008 Ultra Classic (stock wheels / tires)... very annoying

My Softail is right on.

 

I dont give a rats a$$ if my speedo is off by a mile a hour or three, its the dam gas gauge on my SE Deuce that I need to try to get more in line with reality! Other than that I am very happy (knocking on wood) with all the rest of the instrumentation on both of my rides.

 

My old RK (96) had a certified speedo -- Dead on. My brother's bike, also certified, dead on. My buddies older dyna, certified speedo, dead on.

My 2008 SG - "Certified" noticeably missing from the speedo -- 10% off at 30MPH, 5% at 50, seems to find its own around 65.

Eh, it helps keep me from speeding through the packs of crotch-rockets riding wheelies down the street.