Speedo off?

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Old Aug 18, 2015 | 10:05 PM
  #11  
KLX25O's Avatar
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Default 12 O clock labs

Originally Posted by Mcs92
Carbbed. It's an American bike.
I would say yea,

because most aftermarket parts are for 2012-and up.

I would email 12 o clock labs to be sure.

its not fun getting the part you want, when it wont fit. haha.

that's why I always double-triple check before ordering.
 
Old Aug 19, 2015 | 01:57 PM
  #12  
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From: Sandy Eggo
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Mine read around 78 mph when I was going 65 according to my gps

yes its way off

I try to gps new bikes first thing because most are off 5 or so


the 12 oclock labs device is great, and since you have a gps too you can get it set dead on

strange on mine its pretty much dialed in to 65 mph to my gps
but once I go faster my speedo reads slower, but thats not an issue for me I dont those speeds too often
I could probably tweak it but too lazy
 
Old Aug 20, 2015 | 04:42 AM
  #13  
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Odd your odo is off if you correct the speedo. Thanks for all the advise!
 
Old Jun 8, 2016 | 08:12 AM
  #14  
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I think it's universal among bike makers that the speedo will show faster than actual - but in fairness using a GPS is not so great either.

Technically the GPS is always absolutely perfect and we should bow down, proffer our asses and worship the GPS gods - but in reality the GPS is figuring out your distance over a series of wiggly lines - and if you've ever looked at the actual plotted lines you'll see they are often way off the actual road, and often showing straight sections were you were actually winding around curves.

The reason is the GPS is sampling your position every now and then. Exactly how often will depend on your unit and its settings but once you realise that then you realise that speedos are NOT universally over-optimistic, it's more a case of GPS units are universally pessimistic, as they tend to presume the twisties are straighter roads than they actually are, and so claim you were going slower than your actual road speed.

And yes, this is why you'll find riding the same route faster or slower will sometimes give you different speed difference between the speedo and the GPS!

Try riding very slowly, which will give the GPS enough time to plot your ACTUAL distance, not just the gaps between recorded points 1, 2, 3, 4 etc. That will give you a baseline of how accurate or inaccurate your speedo is, and from there you can calculate the difference at higher speeds.

But when your GPS shows a bigger and bigger difference the faster you go, that's not your speedo somehow changing it's calibration; thats just your GPS unable to keep up with all the direction changes.

The more twisty the road, the more the GPS will screw up.

I first realised this when I noticed my actual plotted speed on a chart was faster than the speed my GPS showed on my boat. Was my chart inaccurate? Was I plotting the route wrong? But then I was able to overlay the GPS tracks and realised the problem - it was only picking up my location every 40 or 50 yards or so, and then basically guessing the bits between. On a very curvy bit between reefs it showed my speed as more than 10% slower than the actual distance and time suggested - because it was showing 10% less actual distance.

Too long' didn't read: Your GPS is wonderful but it cuts corners, and thus shows lower speeds than actual road speed.

The truth is somewhere between your optimistic speedo and your pessimistic GPS.
 
Old Jun 9, 2016 | 12:48 AM
  #15  
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Back in the 80s I had a new goldwing that the speedo went out the day before I was to take it on a out of state trip. A friend who was a cop got me on a straight stretch of black top heading towards him and flashed his lights when I got to 50 in the top 2 gears and I logged the rpm and made a cheetsheet. It was a 35 zone too! Then the dealer did not have the sender in stock when I got back.
 
Old Jun 9, 2016 | 01:42 AM
  #16  
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Originally Posted by KLX25O
so if my bike has 3700 miles on it,

is that the correct mileage?

I bought it with 1200 miles.
Close enough for government work.
 
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