T120 Speedo-Odometer error? - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 6 (permalink) Old 06-19-2017, 03:18 PM Thread Starter
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T120 Speedo-Odometer error?

2016 T120

Has anyone checked there speedo and OD against other vehicles or devices?
I've been messing with it over the weekend against my son's 2016 Ford and my very accurate GPS.

I am a bit disappointed to find that at an indicated 40mph my true speed is 37mph and at 90mph my true speed is 84mph.
That is as bad as my 40 year old Kawasaki mechanical speedo/OD, which works with an archaic, cable shaft drive, spinning magnet in a cone connected to a needle!

I guess that would be about +6% error across the 0-100mph range.

If my OD displays are off this much too, this now substantially changes what I though my killer fuel 65mpg-72mpg economy has been.... dang it.

Anyone else?
Are the electronics calibrateable?
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post #2 of 6 (permalink) Old 06-19-2017, 03:36 PM
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I've never come across a motorcycle with an accurate speedometer. Even most vehicles are off by a few miles. I can't recall if the speedometer is installed in the front hub or part of the transmission. It's typically left to have some margin of error in case the owner switches tire profiles.
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post #3 of 6 (permalink) Old 06-22-2017, 09:42 AM
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so far among all the bikes I have... only digit ones from the sports bike etc are bang on... the rest as long as a needle involve , is always reading higher than actual.

well trick u ride slower ahahhaha

2015 t.scrambler _ 2009 yamaha r1 _ 2008 honda xr400 _ 2007 suzuki rm250 _ 2006 honda super4 _ 1996 ktm125
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post #4 of 6 (permalink) Old 06-22-2017, 01:31 PM
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Reading 6% high is almost exactly what they did with the Rocket. It's a built in incentive not to break the speed limit.
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post #5 of 6 (permalink) Old 06-22-2017, 01:38 PM
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Mine's even worse than 6%. Speedo reads 45 and I'm actually at 38.
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post #6 of 6 (permalink) Old 06-22-2017, 01:44 PM
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Originally Posted by Soulkicker View Post
2016 T120

Has anyone checked there speedo and OD against other vehicles or devices?
Not sure where YOU'VE been...

ALL motorcycle speedos read optimistically. It's apparently a legal requirement in many countries. Your odometer should be bang-on however..., provided you have air in your tires...

FWIW, Ducati's with ABS read exactly +10% but mileage is dead accurate.

'09 T-100 Forest Green / New England White, TORs, Intiminators & fork tubes raised 15mm, Chrome Ikon 7610 - SP8 Shocks, Custom Sargent Saddle, OEM Chrome Grab Rail, Conti Road Attack 2 EVO's 110/80VR19 & 150/70VR17, 7" Cibie lens and uprated H4 bulb.
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