 Speedo-How accurate
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Joined: Feb 2007
Posts: 311
Adjunct
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OP
Adjunct
Joined: Feb 2007
Posts: 311 |
I've just changed my speedo to a digital one to clear up the front end and make sure everything works okay before spending large on a Dekota or similar.
Ran both for a while to check on accuracy.
Has anyone else noticed how far out the stock speedo is. Its just about spot on at 30mph but thats it.
Nearly 10 miles out at 60. I knew they weren't spot on but thats crazy.
All the best
Chris
Do it today - tommorrow it may be illegal.
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Re: Speedo-How accurate
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Joined: Aug 2005
Posts: 2,726
Loquacious
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Loquacious
Joined: Aug 2005
Posts: 2,726 |
I checked mine on the interstate with a friend who had a GPS. When the GPS was fixed at 73 mph, I had a steady indicated 78 mph. I would assume that the faster you go, the more it would be off.
Bob
2005 America, 904cc - sold. 2014 Trophy SE.
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Re: Speedo-How accurate
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Joined: Feb 2005
Posts: 20,096 Likes: 2
Fe Butt
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Fe Butt
Joined: Feb 2005
Posts: 20,096 Likes: 2 |
Okay! Everybody who's claimed to "hit the ton" on their bikes around here...SADDLE UP!!!
(you've got work to do again!)
Last edited by Dwight; 08/11/2008 12:00 PM.
Yep! Just like a good Single Malt Scotch, you might call me "an acquired taste" TOO.(among the many OTHER things you may care to call me, of course)
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Re: Speedo-How accurate
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Joined: Sep 2007
Posts: 1,668
Learned Hand
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Learned Hand
Joined: Sep 2007
Posts: 1,668 |
Quote:
Okay! Everybody who's claimed to "hit the ton" on their bikes around here...SADDLE UP!!!
(you've got work to do again!)
I always peg it out just to eliminate the guesswork! 
Howbeit when He, the Spirit of truth, is come; He will guide you in all truth:
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Re: Speedo-How accurate
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Joined: Oct 2007
Posts: 1,680
Learned Hand
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Learned Hand
Joined: Oct 2007
Posts: 1,680 |
On the America, mine seems to be off by a little less than 10%
On my T100 it seems to be a little closer to accurate.
Thom
I might be wrong, I sometimes am.
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Re: Speedo-How accurate
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Joined: Jan 2005
Posts: 18,825
"Lighten up, Francis."
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"Lighten up, Francis."
Joined: Jan 2005
Posts: 18,825 |
My speedometer is very close to accurate with the 120/90-18 front tire, but the odometer under-reports by about 4-5%.
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Re: Speedo-How accurate
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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 |
My odometer is within 1% but my speedo is about 7% fast. I've tested it against both a GPS and one of those radar units they put along the highway to get you to slow down, and had the same results. My Mini Cooper is almost exactly the same.  British Engineering?
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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Re: Speedo-How accurate
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Joined: Jan 2005
Posts: 3,753
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 3,753 |
mine seems to be off exactly 5mph no matter how fast i am going
Frank
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: Speedo-How accurate
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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Monkey Butt
Joined: Jan 2005
Posts: 7,643 |
Check mine the other day on one of those signs at the side of the road, you are going so fast "Slow Down" signs, it seems pretty accurate..
Ray(UK)
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Re: Speedo-How accurate
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Joined: Mar 2007
Posts: 5,616
Check Pants
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Check Pants
Joined: Mar 2007
Posts: 5,616 |
Up to 30 my spedo and GPS are dead on.
Over 30 I get a difference of a 2-3 mph.
As I go faster in increases to about 5 mph off.
I just assume that anything over 30 is 5mph off.
SOLD: 07 Black BA, 39mm FCRs, TPUSA stage 1 head, TPUSA 813 cams, TPUSA 10.8:1 pistons, TTP #3 igniter, Specialty Spares Long Cannons, Tsukayu Hard Bags. 82HP/55tq
NEW: 19 Goldwing Tour DCT
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Re: Speedo-How accurate
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Joined: Oct 2006
Posts: 261
Adjunct
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Adjunct
Joined: Oct 2006
Posts: 261 |
My ton-up was GPS confirmed and the speedo was pushing 108... I've never ran the GPS long enough to see how the odometer holds up.
2007 America, Phantom Black/Sunset Red
Deposit down on 2010 Thunderbird - can't wait for it!
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Re: Speedo-How accurate
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Joined: Jul 2008
Posts: 13
Complete Newb
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Complete Newb
Joined: Jul 2008
Posts: 13 |
I attached a GPS to my 05 Speedmaster.
Speed shown on speedo was 10% slower than GPS at all speeds.
Odometer close to right.
I've got a mate who bought a Rocket111, and couldn't work out why all the traffic was passing him.
He took some convincing that Triumph would give him a speedo 10% slow.
Quote to fix would only gaurantee to within 5%.
I have left mine as is. 10% is easier to work out at a glance.
You'd think Triumph could do better though, wouldn't you.
Jimmy Stonefish
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Re: Speedo-How accurate
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Joined: Jan 2005
Posts: 5,172
Saddle Sore
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Saddle Sore
Joined: Jan 2005
Posts: 5,172 |
It's been a known problem for years. Anything over 30-40 mph it is off 8-10 mph.
I just do 10 over the posted speed above 35. I've checked mine against those police displays on the side of the road and they are about as accurate as my speedo... everyone seems to be different.
More flags
More fun!
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