Speedometer error on speed?

Byron · Jul 24, 2019

Just purchased a Garmin Drivesmart 61. So far loving the Garmin but noticed something with the difference in the speedometer and the Garmin. The speedometer is about 5 miles per hour slower than the Garmin. I have seen this same thing on other bikes so does anyone make a device to correct this?

Karl · Jul 24, 2019

"Speedohealer" is the brand but not sure if they make a S10 specific device. Check them out.

Involute · Jul 24, 2019

Mine is accurate within 1-2 mph according to my garmin

SHUMBA · Jul 24, 2019

Byron said:
Just purchased a Garmin Drivesmart 61. So far loving the Garmin but noticed something with the difference in the speedometer and the Garmin. The speedometer is about 5 miles per hour slower than the Garmin. I have seen this same thing on other bikes so does anyone make a device to correct this?

I have a Garmin Drive Smart 61 mounted on my handlebars using a large cell phone gripper. Works perfectly with the 6 inch screen display, sharp and great resolution and readable on sunny days.
On both my Africa Twin and the Tenere I observe the bike's spedo reads approximately 10% higher than the GPS speed. Bike reads 100 kilometers/ hour, GPS says 93-94 km
Now increase speed to say 170 kph, GPS says 158 kph.
I think the motorcycle manufacturers do this deliberately for whatever reason.
I'll believe the GPS
SHUMBA

Sent from my SM-A520W using Tapatalk

EricV · Jul 24, 2019

Byron - I'm in West Tupelo. If you want to verify with a second device, let me know. I run a Garmin dezl 760 trucking unit on my Super Ten. US Gen I bikes are typically off up to 9%. US Gen II bikes are usually pretty close. All non-US bikes appear to mostly be around 9% off. Speedo being higher than actual.

What tires are you running?

And yeah, I installed a Speedohealer on my Gen I to correct the speed. No need on the Gen II.

OldRider · Jul 24, 2019

I have a speedohealer and it works great. Speedo and GPS read the same.

fredz43 · Jul 24, 2019

You say slower, but do you mean faster? The gen 1 Super Ten's read about 10% higher (faster) than actual speed. This was addressed with the Gen 2 units, 2014 and newer and they only read about 1-2 % faster than actual.

JamesGang · Jul 25, 2019

My 2018 non ES reads 9% higher than my Garmin. I usually ride 10 kph over the posted speed limit (as displayed on speedometer) and have never been pulled over by LEO. This error seems excessive and does annoy me.
Yours,
Rick

Squibb · Jul 25, 2019

Why bother. Either drive to the SatNav or use the Yamaha margin as a potential saviour - here in Europe, some countries police speed excesses stupidly tight, where say 2/3 kph over the limit will attract a speeding ticket. Tyre wear will always remains an issue anyway, so GPS is best.

The UK normally operates on 10% + 2 mph excess, unless we have a local accident problem zone, when this can be tightened somewhat arbitrarily. However, with the advent of more 20 mph zones, it is so easy to see one's speed drift over 24 mph without thinking. Generally, the advent of good CC has been a real bonus on bikes.

scott123007 · Jul 25, 2019

[QUOTE="Squibb, post: 375328, member: 5370. However, with the advent of more 20 mph zones, it is so easy to see one's speed drift over 24 mph without thinking. Generally, the advent of good CC has been a real bonus on bikes.[/QUOTE]

Except that the cruise control does not work under 27 mph. LOL
At least on my bike anyway.

Clawdog60 · Jul 25, 2019

My speedo reads 2 mph fast consistently checked with 3 different gos units.

EricV · Jul 25, 2019

scott123007 said:
Except that the cruise control does not work under 27 mph. LOL
At least on my bike anyway.

I used to go thru a small town with a 30 mph limit and local cops that would cite for 2 mph over. Setting the CC at 30 on the nose, (GPS speed), was just something I got used to doing there when I went thru town. Made that 2 mile main drag thru town stress free.

JeffB · Jul 25, 2019

My 17 ES is 1 mph faster than my garmin 590lm with stock tires all all speeds.

Byron · Jul 25, 2019

EricV said:
Byron - I'm in West Tupelo. If you want to verify with a second device, let me know. I run a Garmin dezl 760 trucking unit on my Super Ten. US Gen I bikes are typically off up to 9%. US Gen II bikes are usually pretty close. All non-US bikes appear to mostly be around 9% off. Speedo being higher than actual.

What tires are you running?

And yeah, I installed a Speedohealer on my Gen I to correct the speed. No need on the Gen II.

Still on the factory tires. I have seen this in about every bike I have owned.

Byron · Jul 25, 2019

Squibb said:
Why bother. Either drive to the SatNav or use the Yamaha margin as a potential saviour - here in Europe, some countries police speed excesses stupidly tight, where say 2/3 kph over the limit will attract a speeding ticket. Tyre wear will always remains an issue anyway, so GPS is best.

The UK normally operates on 10% + 2 mph excess, unless we have a local accident problem zone, when this can be tightened somewhat arbitrarily. However, with the advent of more 20 mph zones, it is so easy to see one's speed drift over 24 mph without thinking. Generally, the advent of good CC has been a real bonus on bikes.

That is spot on from what I’m seeing.

Byron · Jul 25, 2019

SHUMBA said:
I have a Garmin Drive Smart 61 mounted on my handlebars using a large cell phone gripper. Works perfectly with the 6 inch screen display, sharp and great resolution and readable on sunny days.
On both my Africa Twin and the Tenere I observe the bike's spedo reads approximately 10% higher than the GPS speed. Bike reads 100 kilometers/ hour, GPS says 93-94 km
Now increase speed to say 170 kph, GPS says 158 kph.
I think the motorcycle manufacturers do this deliberately for whatever reason.
I'll believe the GPS
SHUMBA

Sent from my SM-A520W using Tapatalk

Agree, that is about right for my bike as well.

WJBertrand · Jul 25, 2019

Byron said:
Just purchased a Garmin Drivesmart 61. So far loving the Garmin but noticed something with the difference in the speedometer and the Garmin. The speedometer is about 5 miles per hour slower than the Garmin. I have seen this same thing on other bikes so does anyone make a device to correct this?

This is very unusual, the normal situation is the reverse of that that, i.e. the speedometer on the bike will typically show a higher speed than the GPS does. I've found this to be true in every bike, and car for that matter, I've ever owned since starting using GPSs.

HeliMark · Jul 25, 2019

With my Gen 1, I just figure my spedo is showing roughly 4-5 mph faster then the actual speed, makes it easy. I have a GPS, but a lot of the time, it is easier to look at the spedo.

Clawdog60 · Jul 25, 2019

Squibb said:
Why bother. Either drive to the SatNav or use the Yamaha margin as a potential saviour - here in Europe, some countries police speed excesses stupidly tight, where say 2/3 kph over the limit will attract a speeding ticket. Tyre wear will always remains an issue anyway, so GPS is best.

The UK normally operates on 10% + 2 mph excess, unless we have a local accident problem zone, when this can be tightened somewhat arbitrarily. However, with the advent of more 20 mph zones, it is so easy to see one's speed drift over 24 mph without thinking. Generally, the advent of good CC has been a real bonus on bikes.

Sounds like Canada=anal on speeding

U.P.rider · Jul 25, 2019

My speedo is spot on with both my Garmin 680t and a gps iPhone app called “speedometer”.

Sent from my iPhone using Tapatalk

Speedometer error on speed?

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