stupid question?

[gtr a14]

My mate has a c10 with the speedo in kph, in uk we use mph, is it the internals of the clock that determin kph or mph or is it the speedo drive that does this? 

[2fast]

It's the marking on the dial face. Most US models show both in over/under arcs. Check to be sure you do not have a smaller inner arc with MPH.

[connie_rider]

Agreed. Internals on the speedo and speedo drive should be the same.....KPH  and MPH....
But as I recall the bikes with KPH do not have a MPH conversion shown on them.

Ride safe, Ted

[gtr a14]

thanks folks, at present his speedo has a decal over the face showing mph readings, i have spare mph clocks in garage but was not sure if a straight swop would work!! 

[julianop]

What, you can't divide by 1.6 while screaming down the highway at 180kph? ;-)

[gtr a14]

  lol.

[Boomer]

In the UK the bike must have MPH on the clocks to pass the annual inspection (MOT test).
Otherwise divide by 1.6 is easier. Personally I just remember the following table;
30Mph = 50Kph
40Mph = 65Kph
50Mph = 80Kph
60Mph = 95Kph
70Mph = 110Kph
Over 110Kph = illegal 

You can buy some mechanical converters that screw in line with the speedo cable, or you could replace the clock face.
Be aware that the needle is VERY fragile and easily broken.

[gtr a14]

Thanks boomer, will try such a device 

[julianop]

When precise speed matters (slabbing it) I enable the GPS on my smartphone and use the Ulysses Speedometer app.
That won't help you get past an MOT, of course, but it does give you an accurate reading plus some additional fun features.

Remember that if your speedometer is in kmh your odometer is in km....

[Summit670]

All this math is making me hungry!

Reminds me of a story - a group of us went from Nebraska to Mexico 15 or so years ago, where limits are in Kmph.  Since I was the only bike that had both features, they asked me to keep 7 of us at the speed limit because nobody wanted to take any chances and have to deal with Mexican Policia or whatever they are called.     That went fine for about 25 miles, then everyone started speeding anyhow and luckily we didn't get stopped.  We were only 16mph over so it wasn't like we were 50 over.

[Classvino]

I guess it's just second nature for us Canadians that were licensed before Canada adopted the Metric system...   Don't even have to think anymore, the conversion is almost automatic.  100km = 60miles, 80=50, 60=40, 50=30, these aren't the numbers you'd get on a calculator, but if you look at a bilingual speedo, they're not more than a mile or two off - probably close enough to make no difference...

I remember when we first switched over, you could get sticker sets for those that had cars marked only in MPH.  They had every multiple of 10 up to 180 or so, but most people I remember only put the ones corresponding to certain speed zones on : 100,80,60,50.

I'll admit to forgetting occasionally though. There have been a few times when I've been 'south of 49' on I81 and thought that traffic was moving REALLY fast for 65, before realizing I was doing 65kph rather than 65mph...  About 25mph too slow.

Jamie