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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-11-2012, 09:25 AM   #1 (permalink)
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2005 Bonnie Speedometer reads 10% high

I got a 2005 Bonnie two years ago and the speedo has read about 10% high since I got it.

Is there a simple way to adjust the speedo?

Casey
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Old 11-11-2012, 10:51 AM   #2 (permalink)
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I got a 2005 Bonnie two years ago and the speedo has read about 10% high since I got it.

Is there a simple way to adjust the speedo?

Casey
Since there are no "easy adjustments, the two ways to easily deal with it is to either get a front tire that has a larger overall diameter (they're not all the same, even if they have the same size designation) such as a Metzler ME880 (great tire btw). Or you can source a Thruxton speedometer drive from a MC salvage yard such as Pinwall. They are set up for an 18" wheel and that will correct things by turning less rpms per mile...


I run ME880 fronts, stock size and they give me just about dead on readings when I go past those "you speed is" radar stations...
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Old 11-11-2012, 11:07 AM   #3 (permalink)
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I bet it's flashing red when it tells you your speed ;}
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Old 11-11-2012, 07:20 PM   #4 (permalink)
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Quote:
Originally Posted by SevenMonkeys View Post
I got a 2005 Bonnie two years ago and the speedo has read about 10% high since I got it.

Is there a simple way to adjust the speedo?

Casey
Yeah!!, Ride 10% slower!!!.......
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Old 11-11-2012, 09:28 PM   #5 (permalink)
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I put a Metzler on the rear, but the BattleAx in front hasn't needed replacing. I'll probably put a Metzler up front when the time comes.

Thanks.
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Old 11-11-2012, 10:55 PM   #6 (permalink)
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Not having a Bonnie myself, is the speedo mechanical or electronic? If it's electronic, a speedo healer should do the trick.
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Old 11-12-2012, 09:08 AM   #7 (permalink)
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Old 11-12-2012, 09:21 AM   #8 (permalink)
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Hello

UK law (and probably elsewhere) allows for a 10% speedo error (reading high) to allow for different tyre sizes and wear and bragging rights or use a sat nav.

Regards

Barry
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Old 11-12-2012, 09:34 AM   #9 (permalink)
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You can't even really trust the nav systems either. My Garmin reads up to 4 mph off sometimes. It also varies depending on if you're on flat land or in the hills. Long story short, are you sure the readings are off?

I thought that my '06 was off 4-5 mph, but after doing my own calculations, I realized with my stock tire, at 60 mph it was only 1-2 mph wrong.
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Old 11-13-2012, 09:50 AM   #10 (permalink)
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I knew it was not correct just based on what traffic around me was doing. I'd be doing 15 over in a 45 zone and still getting passed :-)

So I used a simple speedo app for Android on a long straight stretch and held a steady speed.

The speed given by GPS is pretty accurate if held steady for say ten seconds. It has to smooth your velocity a bit as it calculates it. It could be off by couple percent, but not ten.

I'm used to the speed being off, but I hate that the odometer has the same error. And all my mpg calculations have a fudge factor.
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