Mph Usa Vs Uk

Does anybody have any more info on these speedometer settings?

I found write up where you can change the speedometer reading.

Miles/km display

Toggle Miles/KM display by holding all 3 buttons until speedo displays 1, 2 or 3 (the current choice) press "Scroll" until the desired units are displayed.
press "set" button to store setting and exit.
1= km/h 24 hr clock
2= Mph UK + 12 hr clock
3= Mph USA + 12 hr clock

I tried it and sure enough you can change between not only km/h but USA and UK mph.
My bike speedometer was always about 9% under actual speed. It was set for #2 Mph UK

After changing it to 3 Mph USA it seems to be accurate now.

 

But an American mile and a British mile are the same!

 

Basically you can change the speedometer settings from UK mph to USA mph.
I have no idea what the difference would be, but after changing to the USA setting, my speedometer seems to be more accurate.

 

Right! what does this setting do for sure.

 

I wonder if it has anything to do with regional requirements eg maybe there is a reg. for some markets that the speedo overreads a bit whereas the USA regulation might require 100% accurate speedo reading ??

 

I hope mine is slower than indicated, cause lord knows I don’t ride the posted speed limit....er I mean, I ride exactly the speed limit at all times, yeah that’s it.

 

Sounds the most plausible, but don't understand why that would cause a difference in speedo reading

 

This is getting interesting. Just to clarify, my speedometer was reading faster than my actual speed. i.e. when traveling at 60 mph my speedometer would read about 53mph.

Also, my 2009 Street Triple R does not have a gas gauge, just a fuel light when low. There is a MPG reading on one of the trip screens. Maybe that is the only thing this setting affects. I'll have to match it up with the same GPS I used to discover how far off my speedometer initially was.

 

Is one setting nautical miles per hour (knots)?

1 knot = 1.15 mph, so 53 knots = 60.93mph which is approx the figues quoted.

I've no idea why you need to know your speed in knots when riding a bike?

 

Maybe it's because we're an island nation

 

The ONLY sensible explanation is in mpg because of the variation between US and Imperial gallons. What troubles me is that DD came up with it first

 

That's far too sensible.

I'm sticking with pirate mode

 

As I understand UK and USA miles were different until standardised in the late fifties but why they are different on a modern bike I no idea