for those that came w/ 14's - Toyota Yaris Forums

thebarber · 07-18-2009, 08:53 PM

for those of us who's yaris came w/ 14's from the factory w/ 175-65-14 tires....it would seem as though the speedo is calibrated for 185-60-15 sizing...

i say this as i was driving w/ friends w/ oem-sized wheels and gps, and since we had radio's, i could ask what speed they were going.

it would seem that w/ 195-50-15 tires, my speedo was off by about 4km/h

that would lead me to believe that despite the fact that my car came with 175-65-14 tires, my speedo is calibrated for 185-60-15

just food for thought next time you're buying tires for your yaris

Tamago · 07-18-2009, 09:01 PM

do you both have ABS? or neither? or one and not the other?

Sodium Duck · 07-18-2009, 09:35 PM

Hmph. Is there a way to see what is actually programmed in the ECU (or wherever this info is stored)? This would be really annoying to have to fix in my fuel economy spreadsheet lol.

thebarber · 07-19-2009, 08:24 AM

Quote:

Originally Posted by Tamago

do you both have ABS? or neither? or one and not the other?

i dont have abs

friends w/ matrix's both have abs....one is an xr and the other an xrs.

both said they were doing 113-114kph when i was doing 117-118

marcus · 07-19-2009, 09:30 AM

try using gps..i find them more accurate on reading on ur actual speed..

thebarber · 07-19-2009, 11:58 AM

Quote:

Originally Posted by marcus

try using gps..i find them more accurate on reading on ur actual speed..

both guys were using gps that agreed with THEIR speedos, not mine

regal · 07-24-2009, 11:15 PM

This is interesting info, I try to keep the diameter as close to stock as possible, otherwise your data is off and it can affect your gas milage as well.

I wonder if they ran the EPA MPG test on 14"s or 15's ?

thebarber · 07-24-2009, 11:34 PM

Quote:

Originally Posted by regal

This is interesting info, I try to keep the diameter as close to stock as possible, otherwise your data is off and it can affect your gas milage as well.

I wonder if they ran the EPA MPG test on 14"s or 15's ?

i honestly have no idea...its a clusterfuck

spookz · 07-25-2009, 05:48 AM

That's odd.. my Yaris comes with 185/60R15, but when my speedo reads 60km/h, the GPS reads ~57-58km/h.. Maybe my speedo is off, either that or my GPS is not accurate.

07-18-2009, 08:53 PM	#1
thebarber daily driver View User's Garage Drives: the #wrecho Join Date: Jun 2006 Location: Grand Rapids, MI Posts: 5,877	for those that came w/ 14's for those of us who's yaris came w/ 14's from the factory w/ 175-65-14 tires....it would seem as though the speedo is calibrated for 185-60-15 sizing... i say this as i was driving w/ friends w/ oem-sized wheels and gps, and since we had radio's, i could ask what speed they were going. it would seem that w/ 195-50-15 tires, my speedo was off by about 4km/h that would lead me to believe that despite the fact that my car came with 175-65-14 tires, my speedo is calibrated for 185-60-15 just food for thought next time you're buying tires for your yaris __________________

07-18-2009, 09:35 PM	#3
Sodium Duck ╚══════════RN Drives: 2008 Liftback Join Date: Oct 2008 Location: Western Mass. Posts: 999	Hmph. Is there a way to see what is actually programmed in the ECU (or wherever this info is stored)? This would be really annoying to have to fix in my fuel economy spreadsheet lol. __________________ 42.88

07-25-2009, 05:48 AM	#9
spookz JDM yO! View User's Garage Drives: '09 3dr. 5-spd Join Date: Oct 2008 Location: Sydney, Australia Posts: 331	That's odd.. my Yaris comes with 185/60R15, but when my speedo reads 60km/h, the GPS reads ~57-58km/h.. Maybe my speedo is off, either that or my GPS is not accurate. __________________ .

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
The Vitz is in the 14s!	ChinoCharles	Tracking, Racing, Auto-X Forum	66	12-16-2011 11:19 PM
FS: Waterloo, ON: 14's and r comps	thebarber	Items for Sale by private party	7	01-21-2009 06:02 PM

07-18-2009, 09:01 PM	#2
Tamago Start another Oil Thread! View User's Garage Drives: ZZW30 Join Date: Dec 2006 Location: South FL Posts: 4,890	do you both have ABS? or neither? or one and not the other?

07-19-2009, 09:30 AM	#5
marcus toyota View User's Garage Drives: 2007 Yaris RS Blazed Join Date: Oct 2006 Location: toronto, canada Posts: 3,637	try using gps..i find them more accurate on reading on ur actual speed..

07-24-2009, 11:15 PM	#7
regal Drives: 09 Yaris 3 Dr White LB Join Date: Mar 2009 Location: PA Posts: 432	This is interesting info, I try to keep the diameter as close to stock as possible, otherwise your data is off and it can affect your gas milage as well. I wonder if they ran the EPA MPG test on 14"s or 15's ?