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Tire size difference/affect on speedometer? #5261057 11/07/19 05:41 PM
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irv Offline OP
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I just purchased some snow tires for my son's GF. The girlfriends mother wanted snowy's on her daughters car asap with the 3-4 inches of snow we received last night/this morning so since I was the chosen one to do this, I purchased some I found online but chose a different size tire/wheel.

The winter tires/wheels with TPM's, (hopefully?) I bought came off a 2005 Malibu just like her car (exact same) but are 205-65-R15's compared to her current tires/wheels which are 215-60-R16's.

How much difference in speed will she notice being as the tire is slightly smaller in diameter than what is currently on her car?

As an aside, I got Nexen tires (which I believe are Cooper tires?) on stock Malibu rims and only paid 200 dollars for them. The tread is still healthy/deep, imo, as well.

Key's tires.pngKeys tires1.pngKeys tires2.png

2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: Tire size difference/affect on speedometer? [Re: irv] #5261059 11/07/19 05:43 PM
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4WD Offline
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Re: Tire size difference/affect on speedometer? [Re: 4WD] #5261074 11/07/19 06:01 PM
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irv Offline OP
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Originally Posted by 4WD


Thanks, 4wd.
This is the info it gave me. 2.6% difference.

Thoughts?
You might have to punch the numbers/sizes in yourself? All the numbers have shifted over when I copied and pasted it.

Tire Size Comparison
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
205/65-15 5.2in 12.7in 25.5in 80.1in 791 0.0%
215/60-16 5.1in 13.1in 26.2in 82.2in 771 2.6%

Last edited by irv; 11/07/19 06:05 PM.

2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: Tire size difference/affect on speedometer? [Re: irv] #5261076 11/07/19 06:03 PM
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Download a GPS app to your smartphone. Most will have your landspeed. They are not "always" 100%...but should get you close enough to keep from getting a speeding ticket. Put the phone on the dash and compare while driving.

Shorter diameter tire = speedometer will show faster than what the vehicle is actually traveling.

Taller diameter tire = speedometer will show slower than what the vehicle is actually traveling...which COULD get you a speeding ticket if the traffic laws are strict.


Equal Opportunity Offender
Re: Tire size difference/affect on speedometer? [Re: GoldDot40] #5261080 11/07/19 06:07 PM
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irv Offline OP
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Originally Posted by GoldDot40
Download a GPS app to your smartphone. Most will have your landspeed. They are not "always" 100%...but should get you close enough to keep from getting a speeding ticket. Put the phone on the dash and compare while driving.

Shorter diameter tire = speedometer will show faster than what the vehicle is actually traveling.

Taller diameter tire = speedometer will show slower than what the vehicle is actually traveling...which COULD get you a speeding ticket if the traffic laws are strict.


That's a good idea. I will tell her to do that.

Thanks. cheers


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: Tire size difference/affect on speedometer? [Re: irv] #5261089 11/07/19 06:15 PM
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FordBroncoVWJeta Online Content
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2017 Volkswagen Jetta 1.4T - 2015 Honda CRV 2.4 - 2012 Volkswagen Jetta 2.0 - 2007 Chevy Trailblazer 4.2 - 2003 Ford Taurus 3.0 Vulcan
Re: Tire size difference/affect on speedometer? [Re: FordBroncoVWJeta] #5261102 11/07/19 06:29 PM
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irv Offline OP
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Originally Posted by FordBroncoVWJeta


Perfect.

Thank you! cheers

Speedometer Difference
Speedo Reading Actual Speed
20 mph (32.19 km/h) 19.49 mph (31.37 km/h)
25 mph (40.23 km/h) 24.36 mph (39.21 km/h)
30 mph (48.28 km/h) 29.24 mph (47.05 km/h)
35 mph (56.33 km/h) 34.11 mph (54.89 km/h)
40 mph (64.37 km/h) 38.98 mph (62.74 km/h)
45 mph (72.42 km/h) 43.86 mph (70.58 km/h)
50 mph (80.47 km/h) 48.73 mph (78.42 km/h)
55 mph (88.51 km/h) 53.6 mph (86.26 km/h)
60 mph (96.56 km/h) 58.47 mph (94.1 km/h)
65 mph (104.61 km/h) 63.35 mph (101.95 km/h)


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: Tire size difference/affect on speedometer? [Re: irv] #5261149 11/07/19 07:26 PM
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Quattro Pete Offline
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Originally Posted by irv
The tread is still healthy/deep, imo, as well.

Did you look at the date codes?

FWIW, my winter tires have plenty of tread left, but don't grip/handle in show all that well because they're old.


2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Tire size difference/affect on speedometer? [Re: irv] #5261194 11/07/19 08:34 PM
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Ded Mazai Offline
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I would start looking for a new set of tires if my tires were like this. The tread wear indicator shows that only about 1 mm left if I see it correctly.

Re: Tire size difference/affect on speedometer? [Re: Ded Mazai] #5261223 11/07/19 09:14 PM
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Rand Offline
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Originally Posted by Ded Mazai
I would start looking for a new set of tires if my tires were like this. The tread wear indicator shows that only about 1 mm left if I see it correctly.


are we looking at the same picture? they seem to be at least 8/32 to 9/32 to me.


2019 Jeep Cherokee Trailhawk 2.0T
2020 Hyundai Elantra "Value Edition"
Re: Tire size difference/affect on speedometer? [Re: Quattro Pete] #5261226 11/07/19 09:19 PM
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Originally Posted by Quattro Pete
Originally Posted by irv
The tread is still healthy/deep, imo, as well.

Did you look at the date codes?

FWIW, my winter tires have plenty of tread left, but don't grip/handle in show all that well because they're old.



They probably grip better than my new summer treads

Re: Tire size difference/affect on speedometer? [Re: irv] #5261246 11/07/19 09:42 PM
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I don't know if we are looking at the same picture. A new winter tire usually is about 9-10 mm deep. If a winter tire is at 4 mm (where the tread wear indicator is) it is 100% worn out. I would guess the current tire tread is 5 mm deep. It may last for 1 season depending on the driving style. Not worth the trouble to have them mounted on the wheels even if they were free.

Re: Tire size difference/affect on speedometer? [Re: Quattro Pete] #5261254 11/07/19 09:59 PM
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irv Offline OP
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Originally Posted by Quattro Pete
Originally Posted by irv
The tread is still healthy/deep, imo, as well.

Did you look at the date codes?

FWIW, my winter tires have plenty of tread left, but don't grip/handle in show all that well because they're old.



No, I did not but I am not worried about that in the least.

Like, Rand, I am unsure what pics Ded Mazai is looking at? The tires are, obviously, not new but they are far from being worn out and for $200 dollars for everything, I am not complaining one bit considering the tread that is still on them, which, imo, is still fairly decent and very much worthy.


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
Re: Tire size difference/affect on speedometer? [Re: irv] #5261268 11/07/19 10:27 PM
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tcp71 Offline
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There is a wear bar circled in the picture. Looks like 4+ mm of useable tread.
[Linked Image]


2016 F150 Eco: Edge 0w40
2005 Sienna 3.3: NAPA 5w30 syn. (varies)
Re: Tire size difference/affect on speedometer? [Re: irv] #5261289 11/07/19 11:20 PM
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Q&A: Replacing tyres at 3mm tread “an absolute waste” says Michelin director

https://www.honestjohn.co.uk/news/m...n-absolute-waste-says-michelin-director/


2017 Chevy Impala 3.6 L.
2013 Ram 5.7 L Hemi Bighorn QC 4x4
2008 Chevy Malibu 2.4 L Ecotec
Pennzoil Platinum and/or Pennzoil Ultra Platinum in all 3.
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