fitting 265/70/17

[har05l]

I'm going to fit some maxxis bighorn in a 265 70 17 and want to know if anyone can tell me how far this is going to put my speedo out .

I've run 33's on my 4runa and this was an adjustment of 10kph so would guess it would be around the 5 - 7 kph as this size is around a 32" tyre

Checked search and got nothing

[4wd26]

depends on how far your original speedo reads under.

But from others the 32" tyre makes the speedo read very close to true- or in my case maybe 3kms over at 100km/hour.

[har05l]

Very quick reply 4wd26, thanks

I drove through roadworks on the w-end with their digi reading and quite sure from memory mine was pretty close to spot on so will just have to play it safe and drop a few kph

[Homer]

I find those things are notoriously inaccurate....there was one at a local toll booth that was maybe 15kph out.

Test yours against a GPS to make sure because as 26 says it may bring it to the correct reading...manufacturers all tend to fudge on the side of reading over.

Don't know for sure about the MN but the ML's were all reading near 10% faster than the vehicle was actually travelling...

[al coholic]

Like Homer said Ken, dont trust those roadwork speed checks

With 32's on mine....it brought the speedo up to 100% accurate at 100km/ph testing against my GPS. Havent been pulled up yet!!!

[Sloth]

They made mine smack on as well!

[shortpoint]

G'day!

When you get them, post a pic. i would be keen to see how they go. i just fitted 255/65/R17 and they are great. may go bigger next time

Cheers

Phil

[Diddy]

Like Homer said Ken, dont trust those roadwork speed checks

With 32's on mine....it brought the speedo up to 100% accurate at 100km/ph testing against my GPS. Havent been pulled up yet!!!

I agree with you al mine is now also spot on according to the gps thanks to the bigger rubber but my fuel economy has taken a blow


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[al coholic]

Like Homer said Ken, dont trust those roadwork speed checks

With 32's on mine....it brought the speedo up to 100% accurate at 100km/ph testing against my GPS. Havent been pulled up yet!!!

I agree with you al mine is now also spot on according to the gps thanks to the bigger rubber but my fuel economy has taken a blow

So you should agree.............Wasnt open for discussion Tristan...........I am always right!!!!

[Fnordy]

Ok - I have the 265/70R17 MTZ's and have found the following (also use a scangauge for the exact same concerns)

- Scangauge is out exactly 6% across the board when measured against two different GPS's
- Calibrate Scangauge by 6 and is identical to GPS
- Speedo is slightly different in that it is not a linear or progressive difference but rather the top end is shaped off.
- 30kph speedo is about 31/32 actual
- 50kph speedo is about 53kph actual
- 60kph speedo is about 64/65 actual
- 80kph speedo is about 83kph actual
- 100kph speed is about 101kph actual

I have seen this on other vehicles (was same on prev Pajero and have other friends with similar)

I am not a conspiracy theorist, but believe (some) manufacturers are shaping the top end of our speedos, possibly for safety or possibly to allow greater margin for error in measurements at higher speeds?

Who knows, but have read others with similar measurements on NT.Net

Cheers

[Naff]

Mine's very similar to Fnordys.

Dooo eeeet.

[har05l]

Thanks for all replies and they will be fitted this week hopefully and I will get some picks up

I may just get the speedo recalibrated to be on the safe side if it does blow out to much...and I hope my feul economy stays the same cause I like it

[al coholic]

I hope my feul economy stays the same cause I like it

Ahhhh.............NOPE!!!!! Add 2lts per 100k's.

[har05l]

I hope my feul economy stays the same cause I like it

Ahhhh.............NOPE!!!!! Add 2lts per 100k's.

NOOOOOOOOOOOOO

[borngeek]

I run this size and fnordy is on the knocker as far as my experience...

and yeah add 2litres/100

//my swirl mod brought it back somehow (pity you cant do with that MN of yours...supposedly)

[CameraManScotty]

I hope my feul economy stays the same cause I like it

Ahhhh.............NOPE!!!!! Add 2lts per 100k's.

NOOOOOOOOOOOOO

is that highway or around town?
round town I'm mangaing 7.8-8.3L/100 (9.2 L/100 when the misses drives) but about 11.9-12.6L/100 on the highway

[har05l]

^^^^^ That's town and highway CMS

On my 2nd set of bighorns and average around 12's regularly but there is always a fuel station within reach so I don't worry to much about what it uses