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How does Speedometer speed compare to real/GPS Speed?

  • GPS/real speed matches Speedo

    Votes: 8 42.1%
  • Speedo is low GPS/real speed is higher than Speedo

    Votes: 7 36.8%
  • Speedo is high GPS/real speed is lower than Speedo

    Votes: 4 21.1%
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Discussion Starter #1 (Edited)
For 2014+ cars I'm curious if others are seeing the same that I see...

I'm running 205/55-16 and I like the change better than the 60 profile for handling/feel/ride and look... I've posted before on the speedo... here's how it was with the 2014 an 2018

I had a 2014 and now a 2018 when I change my tire size...

205-60/16 - Speedo 100km/h - GPS - 101 km/h
205-55/16 - Speedo 100km/h - GPS - 96/97 km/h
225-45/17 - Speedo 100km/h - GPS - 97 km/h


I found it quite surprising that the speedo reads low with stock size tires... rare as normally they show you 1/2km lower than actual. Really looks like they change from 205/55 to 205/60 without changing the speedo calibration. The 2012 we've got that comes with 205/55 stock reads the same as above...

Curious what others with are seeing with stock tire sizes... 206/60-16
 

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With the OEM 205/60/16 Yokohamas, my '15 Mazda speedometer seems to report a slightly slower-than-actual speed, by one or two MPHs.

This is unusual for me, as normally the factory setup reads a bit faster-than-actual speed in the previous cars from the factory that I've owned. I always figured the factory wanted to keep from being blamed for speeding tickets or speed-related accidents, but Mazda doesn't seem concerned about that. :)
 

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You have to get the circumference correct. Of course 205/55/16 will be off.

I'm going to downgrade from 18s to 16s. But I will put 225/55/16 and my speedo will be close enough.
 

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Im asking about grip and handling diference 205 60 vs 215 55

Enviado desde mi G3123 mediante Tapatalk
If you get the same exact tire 205/60 vs 215/55 there won't be much difference.

If you go from a 205/60 all season to a 215/55 high performance all season or summer tire there will be a huge difference in favor of the 215/55. But if you get a 215/55 performance tire the ride might get slightly firmer.

It is hard to answer your question but if you hate the handling of the 205/60 you will probably be very happy with a 215/55 performance tire.
 

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For 2014+ cars I'm curious if others are seeing the same that I see...

I'm running 205/55-16 and I like the change better than the 60 profile for handling/feel/ride and look... I've posted before on the speedo... here's how it was with the 2014 an 2018

I had a 2014 and now a 2018 when I change my tire size...

205-60/16 - Speedo 100km/h - GPS - 101 km/h
205-55/16 - Speedo 100km/h - GPS - 96/97 km/h
225-45/17 - Speedo 100km/h - GPS - 97 km/h


I found it quite surprising that the speedo reads low with stock size tires... rare as normally they show you 1/2km lower than actual. Really looks like they change from 205/55 to 205/60 without changing the speedo calibration. The 2012 we've got that comes with 205/55 stock reads the same as above...

Curious what others with are seeing with stock tire sizes... 206/60-16
Bridgestone Ecopia 205/60/16
Speedo 70mph - GPS (garmin)- 70mph
 

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Continental ts830p Winter
205 / 60 / r16 92H - Speedo 136 km/h - GPS - 130 km/h (84,50 mph / 80,78 mph)

Toyo ner38 Summer
205 / 60 / r16 92V - Speedo 134 km/h - GPS - 130 km/h (83,26 mph / 80,78 mph)

Michelin Primacy 4 Summer
205 / 55 / r16 94H XL - Speedo 138 km/h - GPS - 130 km/h (85,75 mph / 80,78 mph) <- this one is quite annoying
 
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