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11-13-2016, 11:21 PM | #1 |
Drives: 1990 Mustang Join Date: Nov 2016
Location: Montréal, Québec, Canada
Posts: 3
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175/65R14 VS. 175/70R14
Hi guys, my name is Stuart. So I'm no stranger to forums, I did some searching and didn't come up with anything that directly answered my questions. I'm asking these questions on behalf of my girlfriend. So she has a 2007 manual 4-door Hatch (Canadian Car), that currently has 175/65R14's on the car. I wanted to know how much of a change would there be on the speedo if she changed to 175/70R14's. She's staying with a 14" steely as these are for winter driving (better in snow compared to 15's), and she wants a nicer ride feel. I know 14's ride nicer than 15's comfort wise (depends the person and other suspension components). The reason I'm asking is because I have really no idea how changing tire sizes effects the Yaris.. I know on my car I have 2 speedo gears, one on the trans and one on the actual speedo; changing tire sizes if not done correctly would cause me to have to change 1 of the 2 gears to get the right reading on the speedo. All help/info is appreciated, thanks!
(Btw I use this site when comparing tire size changes tire size comparing site) |
11-13-2016, 11:50 PM | #2 |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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well....it's an 8.75 mm difference, larger. so....around 2 Kmph faster than displayed speed at 80Kmph (1.5 Mph at 60 Mph)
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11-14-2016, 12:01 AM | #3 |
Drives: 1990 Mustang Join Date: Nov 2016
Location: Montréal, Québec, Canada
Posts: 3
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Alright thanks, I was just trying to figure out how much of a difference it would make on her to mileage count, was hoping it would only make a small change like the site I use says.. Just didn't know if the speedo was flexible on it's readings, meaning I didn't know how precise the speedo reading is with stock tire size.. Have seen here and there that some people have gotten better readings changing tire size, that's why I wanted to know how much of a change in reading would occur. Thanks.
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11-14-2016, 01:49 AM | #4 |
Drives: 2013 NCP130 Join Date: Nov 2015
Location: Sydney, Australia
Posts: 376
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There is a 3% difference in diameter. You cqn compare the speedometer reading to a GPS to see if there is a difference worth worrying about.
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Running on standard AU 14" steel wheels (14x5 rims, 175/70R14 tyres). Added reversing camera and touch screen radio, cruise control, 16" rear wiper blade, tow bar and dash cam. |
11-14-2016, 08:59 AM | #5 |
daily driver
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When the speedo says 100kph you're actually going 103
But if it's anything like my echo hatch, the speedo reads high in the first place
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11-14-2016, 12:06 PM | #6 |
Super Moderator
Drives: 2014 White VITZ Join Date: May 2007
Location: Huntington Bch, CA
Posts: 4,938
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The speedo is probably not accurate out of the box.
BTW, 185/70/14's are the same diameter as OEM 185/60/15's. |
11-14-2016, 10:17 PM | #7 |
Drives: 1990 Mustang Join Date: Nov 2016
Location: Montréal, Québec, Canada
Posts: 3
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Alright thanks guys! I'll be testing accuracy with my GPS on Wednesday in her car. Also wasn't OEM in Canada 175/65R14 on the base models? So I'm guessing the speedo's in the 14" and 15" cars are the same (RS vs Base vs LE)?
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11-15-2016, 10:33 PM | #8 |
daily driver
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OEM for 2007 was 175-65-14 in Canada
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11-16-2016, 12:30 AM | #9 |
Super Moderator
Drives: 2014 White VITZ Join Date: May 2007
Location: Huntington Bch, CA
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11-16-2016, 07:02 AM | #10 |
It's the illusion you see
Drives: 07 Yaris Sedan Aero Join Date: Oct 2006
Location: Brossard, QC
Posts: 3,888
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I run 195/60R15 in the winter, and I really enjoy the 1/2" extra ground clearance I get.
Sent from my SM-G930W8 using Tapatalk |
11-17-2016, 01:01 AM | #11 |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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11-17-2016, 01:16 AM | #12 |
Drives: 2014 Yaris SE Join Date: Apr 2014
Location: NYC
Posts: 1,076
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11-18-2016, 09:46 PM | #13 |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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why would I buy a new one? I don't have it to tell me how fast i'm moving, that's not its function...
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03-28-2017, 07:03 PM | #14 |
Drives: 2007 2-door hatchback Join Date: Jul 2016
Location: USAnotCA
Posts: 750
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Yokohama IG52c is a tall 175/70R14
By measurement w/ a thin steel tape before inflation, confirmed by actual tire specs provided by TireTrack site, these 175/70R14 Yokohama IceGuard IG52C studless winter tires are 4.3 % taller than the baseline 175/65R14 given by the Tacoma tire link in Post 1. Shown on OEM 5" wide steel rims w/ Tercel centercaps and short valves. Tread width measures 6" between sharp cornered shoulders. Beads were visibly close before installation. Installer asked if I knew these were going to be this tall. Smooth and quiet and seemingly free-rolling on pavement. Car drove and steered nicely on one slushy snow section of high-crown gravel road w/ a moderate hill (up and down.) |
03-28-2017, 10:30 PM | #15 |
2ZR swap. DO IT! Ask how!
Drives: 09 Meteoric Metallic HB Join Date: Feb 2011
Location: West Michigan
Posts: 2,333
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The other consideration is the visible accuracy of the speedo: parallax from different driver positions will slightly alter the location of the needle over the tick marks, easily causing a few percent error. Oh, and you should be more focused on looking out the windows than your speedo.
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03-29-2017, 08:53 AM | #16 |
Drives: 2007 2-door hatchback Join Date: Jul 2016
Location: USAnotCA
Posts: 750
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Mind of Toyota speedometer error factory tire size
Do we know for sure that Toyota didn't somehow setup speedometers differently for the nominally 3.4% different height tires they were installing?
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03-30-2017, 09:04 AM | #17 |
Drives: 07 yaris Join Date: Dec 2016
Location: Newfoundland
Posts: 99
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My speedo on my 07 Sedan was slower with the 175/65r14's. I run 185/70r14 in winter and 195/60r15 summer and those are within 1km/h from speedo to gps
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03-30-2017, 10:10 AM | #18 |
Super Moderator
Drives: 2014 White VITZ Join Date: May 2007
Location: Huntington Bch, CA
Posts: 4,938
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After replacing the OEM 185/60/15's (23.7" dia.) with 205/50/16's (24.1" dia.), my speedo was dead on!
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