 Speedometer accuracy?
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Joined: Jul 2013
Posts: 7
Complete Newb
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OP
Complete Newb
Joined: Jul 2013
Posts: 7 |
I think my 2009 America speedometer is about 10% off. At 50 MPH indicated, I think my actual speed is more like 45. Couple of questions: Is this typical of an America, and is the margin of error (10%) usually consistent at all speeds?
Ken
Ken
2009 America
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Re: Speedometer accuracy?
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Joined: Jan 2005
Posts: 11,124 Likes: 13
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 11,124 Likes: 13 |
Blowing gravel off rural roads
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Re: Speedometer accuracy?
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Joined: Feb 2008
Posts: 2,671 Likes: 15
Loquacious
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Loquacious
Joined: Feb 2008
Posts: 2,671 Likes: 15 |
With a 130/70 front tire my 07 SM indicates approx. 5% fast.
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Re: Speedometer accuracy?
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
Live to love, love to live.
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Re: Speedometer accuracy?
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Joined: Jan 2005
Posts: 2,416
Oil Expert
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Oil Expert
Joined: Jan 2005
Posts: 2,416 |
My 120/90-tire almost nailed it!
"Wise men speak because they have something to say, fools because they have to say something."
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Re: Speedometer accuracy?
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Joined: May 2010
Posts: 5,720
Check Pants
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Check Pants
Joined: May 2010
Posts: 5,720 |
The 130/90-17 I have on a stock TBS rim registers 59 at 60 MPH actual speed.
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Re: Speedometer accuracy?
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Joined: Jan 2005
Posts: 6,308 Likes: 4
Worn Saddle
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Worn Saddle
Joined: Jan 2005
Posts: 6,308 Likes: 4 |
My 03 is about 10% too fast too. The larger whitewall helped it down to about 6% according to the little "slow your butt down" reminder radars on the sides of the road.
A word to the wise is not necessary. It is the stupid ones who need the advice.
Pat
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Re: Speedometer accuracy?
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Joined: Jul 2007
Posts: 6,060 Likes: 6
Worn Saddle
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Worn Saddle
Joined: Jul 2007
Posts: 6,060 Likes: 6 |
Quote:
They ALL do that.
Nope! Before I changed to the slightly larger front tire, my speedo and milemeter was spot on! Checked it twice with cop radar and many times with the mile markers on the roadside.
Fidelis et Fortis
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Re: Speedometer accuracy?
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Joined: Apr 2008
Posts: 3,937
Loquacious
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Loquacious
Joined: Apr 2008
Posts: 3,937 |
Quote:
Quote:
They ALL do that.
Nope! Before I changed to the slightly larger front tire, my speedo and milemeter was spot on! Checked it twice with cop radar and many times with the mile markers on the roadside.
Mine too.
Just lucky I guess.
And you may see me tonight
With an illegal smile
J. Prine
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Re: Speedometer accuracy?
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Joined: Nov 2007
Posts: 1,883
Learned Hand
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Learned Hand
Joined: Nov 2007
Posts: 1,883 |
Mine seems to be good under about 65mph and then gets off farther and farther over 65 mph.
As far as the odometer, well, my buddy John (he has a bonneville) and I were off by about 13 miles after our trip to Keith's last year. We rode together the whole way. I don't know who's was more accurate.
~Brent
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"Nothing you can be is more terrible than what I am." ~ 2007 Black Speedmaster!!
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Re: Speedometer accuracy?
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
Quote:
Quote:
They ALL do that.
Nope! Before I changed to the slightly larger front tire, my speedo and milemeter was spot on! Checked it twice with cop radar and many times with the mile markers on the roadside.
I stand corrected.
Live to love, love to live.
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Re: Speedometer accuracy?
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Joined: Aug 2009
Posts: 1,482 Likes: 5
Learned Hand
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Learned Hand
Joined: Aug 2009
Posts: 1,482 Likes: 5 |
Quote:
Mine seems to be good under about 65mph and then gets off farther and farther over 65 mph.
As far as the odometer, well, my buddy John (he has a bonneville) and I were off by about 13 miles after our trip to Keith's last year. We rode together the whole way. I don't know who's was more accurate.
OK, which one of yous' got up in the middle of the night and went for a pizza run? 
'04' Black America
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Re: Speedometer accuracy?
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Joined: Mar 2005
Posts: 1,284
Learned Hand
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Learned Hand
Joined: Mar 2005
Posts: 1,284 |
It's not a linear function so a speedometer that's off at all will be off by a greater degree at higher speeds. Ours tend to read slightly faster than we're actually going until they go crazy, and most do, then they say you're doing 120 MPH as you're pulling out of your driveway... which, sometimes, I may be.
Strangler
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Re: Speedometer accuracy?
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Joined: Mar 2009
Posts: 12,964
Stickman Yogi
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Stickman Yogi
Joined: Mar 2009
Posts: 12,964 |
[quote...until they go crazy, and most do, then they say you're doing 120 MPH as you're pulling out of your driveway.
That's why I ditched mine.
Live to love, love to live.
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Re: Speedometer accuracy?
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Joined: Jan 2005
Posts: 11,124 Likes: 13
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 11,124 Likes: 13 |
Cinnamon Girl's speedometer reads 5 mph while she is on the sidestand. Then she'll read 15mph too fast when rolling. However, her odometer is spot on. Maybe when she rolls through 100000 I'll change out her speedo for an oem bought about eight years ago...
Blowing gravel off rural roads
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Re: Speedometer accuracy?
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Joined: Aug 2005
Posts: 2,525
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,525 |
I've always know that they lacked a bit of accuracy so yesterday I did a data run for my own sake. I hooked up my GPS and ran with the Guage Display. It was pretty accurate up to 50mph for the most part, then started to read 5 mph high.
50 read 55
60-65
70-75
80-86
90-97
Hope this helps
Erwin
05 America
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Re: Speedometer accuracy?
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Joined: Jan 2005
Posts: 7,629 Likes: 7
Monkey Butt
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Monkey Butt
Joined: Jan 2005
Posts: 7,629 Likes: 7 |
I just got my speedometer back from Foreign Speedo in San Diego. I took it out for a test. I compared it to the GPS I've been using as a speedo. Every five mph from 25 to 80 mph it was within 1% the whole way. They reset the odometer and fixed the speedo for $85 not counting shipping.
We all like to think of ourselves as rugged individualists. But when push comes to shove most of us are sheep who do what we are told. Worst of all, a lot of us become unpaid agents of whoever is controlling the agenda by enforcing the current dogma on the few rugged individualists who actually exist.
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