Modern Vespa : Speedometer from kph to mph?

Speedometer from kph to mph?

OP bigcanoe UTC details Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC
OP bigcanoe Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC	UTC quote My 2015 Primavera has Kilometers as the primary measure on the speedometer. Has anyone come up with a way to replace the scale to make MPH the primary?

flordian

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Rocket Man

GTS 300 ABS 'Drake', GTS 250 (sold), LX 150 and Delta IV rocket. ( Retired. Not my problem anymore)

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Location: Space Coast Florida

flordian

Rocket Man

GTS 300 ABS 'Drake', GTS 250 (sold), LX 150 and Delta IV rocket. ( Retired. Not my problem anymore)

Joined: UTC
Posts: 1934
Location: Space Coast Florida

UTC quote

Re: Speedometer from kph to mph?

bigcanoe wrote:

My 2015 Primavera has Kilometers as the primary measure on the speedometer. Has anyone come up with a way to replace the scale to make MPH the primary?

Had that same issue with an old classic I had many years ago. Instead of converting the speedo I convert it in my head with a simple hack.

Obviously using the formula of 1 km/h = 0.6213711922 mph and doing the math in your head while riding down the road is beyond most of us.

I simply use the indicated speed...example:

divide 100 km/h by 2 = 50
divide 100 km/h by 10 =10
...................................60 mph

Add the two numbers and your close enough vs the actual 62.1 mph.

Bob

OP bigcanoe UTC details Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC
OP bigcanoe Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC	UTC quote Interesting head hack! It has mph too, I'm just being lazy about seeing my speed at first glance.

Mabecane UTC details Hooked Joined: UTC Posts: 124 Location: I'm outa here!
Mabecane Hooked Joined: UTC Posts: 124 Location: I'm outa here!	UTC quote Re: Speedometer from kph to mph? bigcanoe wrote: My 2015 Primavera has Kilometers as the primary measure on the speedometer. Has anyone come up with a way to replace the scale to make MPH the primary? Is there a "MODE" button on your Prima? The pic shows how to switch from KM to MPH. I hope this help.

Mabecane UTC details Hooked Joined: UTC Posts: 124 Location: I'm outa here!
Mabecane Hooked Joined: UTC Posts: 124 Location: I'm outa here!	UTC quote Analog speedometer. Are we talking about the same thing? The Speedometer is analog that shows the speed in MPH and KM on the face of it. I'm sending you the steps to change the trip odo and total odo. Those are digital.

Allens

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Hooked

Looking

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Location: Tampa

Allens

Hooked

Looking

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Location: Tampa

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Re: Speedometer from kph to mph?

[quote="flordian"]

bigcanoe wrote:

Obviously using the formula of 1 km/h = 0.6213711922 mph and doing the math in your head while riding down the road is beyond most of us.

I doubt you speedometer is calibrated to 10 digits (probably not within 2 mph) so, in my head I convert using 5/8.
If I'm going 100 KPH, I think of 5/8 of that, or a little more than half. 60ish. (100 divided by 8 is about 12, and 12 x 5 is about 60.)
That's why metric never became practical in the US, people made it hard. Road signs said, "Atlanta, 60 miles/96.56 km."
Seriously, does anyone believe that they put the sign exactly 60.00 miles from the dead center of Atlanta? I'd be amazed if it was within 10 miles of correct.
So why not just say "Atlanta 60 miles/100 km."?

Minister of Etc UTC details Hooked BV350 ABS Joined: UTC Posts: 106 Location: NYC
Minister of Etc Hooked BV350 ABS Joined: UTC Posts: 106 Location: NYC	UTC quote Huh, who knew? I've always doubled it and added 30. No tickets so far!

OP bigcanoe UTC details Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC
OP bigcanoe Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC	UTC quote Yup mine is a 2015, analog speedometer

WEB-Tech UTC details Veni, Vidi, Posti 2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150 Joined: UTC Posts: 8951 Location: Ashburn, Va. Home to the Internet
WEB-Tech Veni, Vidi, Posti 2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150 Joined: UTC Posts: 8951 Location: Ashburn, Va. Home to the Internet	UTC quote I bought new glasses and can see the smaller MPH numbers no problem now

breaknwind UTC details Ossessionato Red Devil SH150i (11,000) Joined: UTC Posts: 3292 Location: Orange Park Florida
breaknwind Ossessionato Red Devil SH150i (11,000) Joined: UTC Posts: 3292 Location: Orange Park Florida	UTC quote I use the head hack. I GPS the speedo for 30-50-70 that way, most of my ride, I'm not going more than 5mph over the limit. 52kph=30mph 90kph=50mph 122kph=70mph Besides, most scoot speedo's are 10% off. The Honda is spot on and Honda isn't too cheep to put U.S. speedo's on bikes they sell in the U.S.

jimc UTC details Moderaptor The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300 Joined: UTC Posts: 44337 Location: Pleasant Hill, CA
jimc Moderaptor The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300 Joined: UTC Posts: 44337 Location: Pleasant Hill, CA	UTC quote Although my GTS has mph markings - they are inaccurate. So I stick some slivers of tape at the relevant (GPS verified) 30 to 70 mph marks. This is on my GTS, and below on my Fuoco which had kph markings (since sold). ⚠️ Last edited by jimc on UTC; edited 2 times

melt UTC details Enthusiast Vespa 2013 LX125, 2017 GTS300 Joined: UTC Posts: 86 Location: London
melt Enthusiast Vespa 2013 LX125, 2017 GTS300 Joined: UTC Posts: 86 Location: London	UTC quote Always told the kph to Mph formula was divide by 8 multiple by 5. Reverse for other way So 48kph = 30mph 64kph = 40mph 80kph = 50mph 96kph = 60mph 112kph = 70mph Mark the top clear plastic with a black marker pen or thin strip of gaffer tape or small tape dot to remind you.

Allens UTC details Hooked Looking Joined: UTC Posts: 190 Location: Tampa
Allens Hooked Looking Joined: UTC Posts: 190 Location: Tampa	UTC quote breaknwind wrote: Besides, most scoot speedo's are 10% off. I once read that motorcycle manufacturers (BMW) intentionally made the speedos optimistic so that you didn't blame them for a speeding ticket. Indicated 65 was really 60, etc. My Harley was dead on according to GPS.

Syd UTC details Ossessionato GTS300 Super (Mustard) GTS250 Super (Bulger) Joined: UTC Posts: 4955 Location: Tempe, AZ
Syd Ossessionato GTS300 Super (Mustard) GTS250 Super (Bulger) Joined: UTC Posts: 4955 Location: Tempe, AZ	UTC quote I multiply the kph spped by .6 in my head, ignoring the decimal.. Close enough unless you're in a school zone.

ValVitola UTC details Hooked 2018 GTV300 SG, 2012 LXV 125ie 2V, 2015 Primavera 3V 150ie and V90 Joined: UTC Posts: 428 Location: Guatemala
ValVitola Hooked 2018 GTV300 SG, 2012 LXV 125ie 2V, 2015 Primavera 3V 150ie and V90 Joined: UTC Posts: 428 Location: Guatemala	UTC quote I had the opposite situation. My analog speedometer came in Miles and I use Kms. It started to get humidity inside and the dealer changed it under warranty. I ask them if they could install the new one in Kms and they did! Before and after

OP bigcanoe UTC details Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC
OP bigcanoe Hooked 2018 Vespa GTS 300 Super Joined: UTC Posts: 201 Location: Moncure, NC	UTC quote Nice, maybe I can buy a different "sticker" from the dealer then

Motovista

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Veni, Vidi, Posti

GT 200

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Motovista

Veni, Vidi, Posti

GT 200

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Posts: 9188
Location: Main Street, Watts

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Allens wrote:

breaknwind wrote:

Besides, most scoot speedo's are 10% off.

I once read that motorcycle manufacturers (BMW) intentionally made the speedos optimistic so that you didn't blame them for a speeding ticket. Indicated 65 was really 60, etc.
My Harley was dead on according to GPS.

I am not sure that's true, but I've heard it before too. I suspect it has more to do with them converting from KMH to MPH. How accurate, per GPS, are the Euro or Canada market scooters that use KMH as the principal form of measurement?

jimc

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Moderaptor

The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300

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Posts: 44337
Location: Pleasant Hill, CA

jimc

Moderaptor

The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300

Joined: UTC
Posts: 44337
Location: Pleasant Hill, CA

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It stems from the EU mandate that no speedo should under-read.

https://www.thecarexpert.co.uk/how-accurate-is-a-car-speedometer/

www.thecarexpert.co.uk wrote:

The law for car speedometers in the UK

The UK law is based on the EU standard, with some minor changes. A speedo must never show less than the actual speed, and must never show more than 110% of actual speed + 6.25mph.

So if your true speed is 40mph, your speedo could legally be reading up to 50.25mph but never less than 40mph. Or to put it another way, if your speedo is reading 50mph, you won't be doing more than 50mph but it's possible you might actually only be travelling at 40mph.

To ensure that they comply with the law and make sure that their speedometers are never showing less than true speed under any foreseeable circumstances, car manufacturers will normally deliberately calibrate their speedos to read 'high' by a certain amount. As your satnav is not the designated device by which a car's speed is measured, it does not need to incorporate any fudge factoring.

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