Inaccurate Speedometers

jerry · 07-10-2024, 03:03 PM

The Speedos on all of my Ducatis are reading at least 10% out maybe even as high as 12% so when doing 70 mph on speedo the Satnav show 63mph and at 80mph the real speed is 71mph at 100mph on dial its only 90 on Satnav

Can they be recalibrated to only be 5% out ??? ..

My Nissan car ,Toyota Hilux , Fiat Motorhome , Kats Ninja 650 and Djaers Honda rebel are all only 5% out

Dukedesmo · 07-10-2024, 03:55 PM

Don't see how they could be recalibrated in any practical way? I'd just work within what you know.

Both mine have digital speedos that can be setup accurately using GPS/known speed and are within 1mph of correct (as is my car) but the speedo on my old Guzzi is optimistic to say the least - I always thought Guzzi's speed claims were on the generous side but with the speedo they fitted it's about right...

07-10-2024, 03:03 PM	#1
jerry Old Git Join Date: May 2006 Location: Cricklade Bike: Multiple Monsters Posts: 2,909	Inaccurate Speedometers The Speedos on all of my Ducatis are reading at least 10% out maybe even as high as 12% so when doing 70 mph on speedo the Satnav show 63mph and at 80mph the real speed is 71mph at 100mph on dial its only 90 on Satnav Can they be recalibrated to only be 5% out ??? .. My Nissan car ,Toyota Hilux , Fiat Motorhome , Kats Ninja 650 and Djaers Honda rebel are all only 5% out __________________ MONSTERMAN

07-10-2024, 03:55 PM	#2
Dukedesmo Registered User Join Date: Sep 2010 Location: Leics Bike: M900 Posts: 2,901	Don't see how they could be recalibrated in any practical way? I'd just work within what you know. Both mine have digital speedos that can be setup accurately using GPS/known speed and are within 1mph of correct (as is my car) but the speedo on my old Guzzi is optimistic to say the least - I always thought Guzzi's speed claims were on the generous side but with the speedo they fitted it's about right... __________________ M900, 916, LeMans II.