Speedometer accurate with 32's?

VolcomTacoma · 09-09-2004, 02:39 PM

If my Tacoma came stock with 31's and I go up to 32's on stock 15x7" rims, will my speedometer/odometer still be accurate? Just wondering what other's experiences are.

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CynicX · 09-09-2004, 02:41 PM

no...but the difference will be so minute it wont be worth dealing with....we are talking like .... 2% off if that

Nathan Buchanan · 09-09-2004, 02:42 PM

yeah it's close enough. Depending on what brand tire/what size wheel, They might turn out to be the same

bamachem · 09-09-2004, 02:44 PM

I went from 265/70-16 to 265/75-16 (~31" to ~32") and my speedometer was DEAD ON and the ODO was only off by 3.2%

Scarbro22 · 09-09-2004, 03:43 PM

Since my switch i have been the same...whenever i pass one of those standing radar's it seems to be dead on and when the cop gave me a ticket it was also dead on unfortunately...I wish i could get it to where it was slow by a % or 2 so i would be doing 50 thinking i was at 52 or so...i doubt you'll see a difference.

Scofco · 09-09-2004, 03:47 PM

I've also never noticed any difference, like Scarbro said, when I pass a radar that lists my speed, it's always dead on.

***midiwall*** · 09-09-2004, 04:04 PM

When I did this, my speedo _became_ dead on, but now my odometer is 3% low.

Scofco · 09-09-2004, 04:17 PM

Quote:

Originally Posted by M3Man02

This is true if you have say 31's and go to 32's, at 15mph you are off by about .4 miles per hour, at 65mph you are off by about 2.1 miles per hour, at 100 you are off by about 3.2 miles per hour......... Well you get the idea

Quoted from another thread.

4RUNR · 09-09-2004, 05:56 PM

3.8% is what I measured with almost full tread Revos.
Speed read through ODBII vs. GPS readout. Speedos of course differ from car to car but the ODO should be getting the math right through the computer.

31.9" REVO / 30.7" OEM = 3.9% (theoretical number, so leads me to believe the computer and sensors were calibrated very good at the factory for OEM tires)

BC-4Runner · 09-10-2004, 08:33 AM

This is a great site for seeing what the differences in size will do to the accuracy of your speedo.

http://www.1010tires.com/TireSizeCalculator.asp

Scofco · 09-10-2004, 03:19 PM

Very cool, I had never seen that link before. Thanks!

northfacer581 · 09-10-2004, 06:47 PM

im going from goodyear wrangler 265/75/16 to 285/75/16's next friday, with a lift, and new shocks (in my signature) and couldnt be more excited. what types of differences will i notice besides the speed (great link BC-4runner). also, are my new tires 33's? my durango friends brag about how big their tires are.

09-09-2004, 02:41 PM	#2 (permalink)
CynicX Contributing Member Join Date: Jul 2004 Location: Maryland Posts: 2,371	no...but the difference will be so minute it wont be worth dealing with....we are talking like .... 2% off if that __________________ 06 Subaru WRX

09-09-2004, 03:43 PM	#5 (permalink)
Scarbro22 Registered User Join Date: Sep 2003 Location: TN Posts: 227	Since my switch i have been the same...whenever i pass one of those standing radar's it seems to be dead on and when the cop gave me a ticket it was also dead on unfortunately...I wish i could get it to where it was slow by a % or 2 so i would be doing 50 thinking i was at 52 or so...i doubt you'll see a difference. __________________ 94 4Runner 4x4 4.88's, BFG AT 32x11.50. Downey 1.5" Coils Custom Sliders, Husky Liners throughout, custom made internal rod holder, and Smitty Bilt Grille Guard with Hella 500's.

09-09-2004, 03:47 PM	#6 (permalink)
Scofco Contributing Member Join Date: Jan 2004 Posts: 3,577	I've also never noticed any difference, like Scarbro said, when I pass a radar that lists my speed, it's always dead on. __________________

09-09-2004, 04:04 PM	#7 (permalink)
*midiwall* Sponsoring Member Join Date: Dec 2002 Location: Seattleish, WA Posts: 9,078	When I did this, my speedo _became_ dead on, but now my odometer is 3% low. __________________ ~ Mark '96 4Runner Limited S/C MI - 370cc injectors, Air! horns, Airaid MIT, ATS A-arms, 285/75/R16 BFG MTs, Bored TB, Brembo slotted, Cobra 75 WXST, Deckplate, Downey headers, Hayden cooler, IPT valve body, Level 10 torque convertor, Meanstreak exhaust, OME/OME rears, On-board PC (XM, Nav, WiFi, etc), Port 'n Polish, Remote Start, SAW fronts, Hilux console, SMT-5, Stubb's sliders, Supra MAF, TJM-17, 2.0" pulley, Viair 450c, Walbro 190, Weasy2k cams

09-10-2004, 08:33 AM	#10 (permalink)
BC-4Runner Registered User Join Date: Jul 2004 Location: Coquitlam, BC Posts: 18	This is a great site for seeing what the differences in size will do to the accuracy of your speedo. http://www.1010tires.com/TireSizeCalculator.asp __________________ Matthew 1996 4Runner

09-09-2004, 02:42 PM	#3 (permalink)
Nathan Buchanan Registered User Join Date: Aug 2004 Location: Tulsa, OK Posts: 215	yeah it's close enough. Depending on what brand tire/what size wheel, They might turn out to be the same

09-09-2004, 02:44 PM	#4 (permalink)
bamachem Banned Join Date: Jun 2003 Posts: 0	I went from 265/70-16 to 265/75-16 (~31" to ~32") and my speedometer was DEAD ON and the ODO was only off by 3.2%

09-09-2004, 05:56 PM	#9 (permalink)
4RUNR Guest Join Date: Jun 2003 Location: North Pole Posts: 1,619	3.8% is what I measured with almost full tread Revos. Speed read through ODBII vs. GPS readout. Speedos of course differ from car to car but the ODO should be getting the math right through the computer. 31.9" REVO / 30.7" OEM = 3.9% (theoretical number, so leads me to believe the computer and sensors were calibrated very good at the factory for OEM tires)

09-10-2004, 03:19 PM	#11 (permalink)
Scofco Contributing Member Join Date: Jan 2004 Posts: 3,577	Very cool, I had never seen that link before. Thanks! __________________

09-10-2004, 06:47 PM	#12 (permalink)
northfacer581 Contributing Member Join Date: Aug 2004 Location: ASU in Boone....Charlotte is hometown Posts: 994	im going from goodyear wrangler 265/75/16 to 285/75/16's next friday, with a lift, and new shocks (in my signature) and couldnt be more excited. what types of differences will i notice besides the speed (great link BC-4runner). also, are my new tires 33's? my durango friends brag about how big their tires are. __________________ -Andy 99 4runner 5speed Lift: 3" revtek & 2" body; swaybar discos; diff drop Performance: TRD s/c & 7th injector kit, deckplate closed, elbow removed, TMC 1.1, lock-rite in rear Protection: tjm15 w/ tabor 9k, custom sliders Shoes: 305/70/16 nitto terra graps on 16x8 helo maxx 6's Stuff: lots of lights on the surco, yakima big powderhound right now, shackle hangers, sony head unit, aux fuse box, full time power outlets, seat covers, and home of the herculiner mod

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