Tyre sizes - What do you use?

Submitted: Sunday, May 18, 2008 at 15:52

ThreadID: 57725 Views:9225 Replies:4 FollowUps:14

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Jeppie

Hi Folks,
My twin cab Hi Lux originally came with 30 x 9.5 R15 Yokohama AT tyres which have covered 50,000 km and now need to be replaced.
I was thinking of replacing them with 215 R15 BFGoodridge AT.
Do you think that the change in the size of the tyre will make much of a difference to fuel economy or performance?
What do you use on your Hi Lux?

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Reply By: Hilux03 - Sunday, May 18, 2008 at 16:23

Sunday, May 18, 2008 at 16:23

Gday mate,

I have an 04 TD Dual Cab Lux. I just replaced the 29 inch Desert Duellers with 31 inch Mickey Thompson MTZ's and will never look back, the MT's are great tyres, remarkably quiet for such an aggressive tread pattern and awesome in the wet... not to mention the fact that they look tough as...

My mate has just changed over to the Mickey Thompson ATZ's on his Navara and is also extremely happy, he says that they are great in the sand.

I haven't noticed any decrease in fuel economy but the bigger diameter has thrown my speedo out by 4 kmph so you just need to be careful and know what your speed is. I monitor my speed now using my GPS so it's easy.

My father in law has the Goody ATZ's on his Lux and is less than impressed, they're wearing really quickly and he reckons he'll never buy them again.

I wouldnt touch Coopers with a 10 foot pole either.. here is an excellent thread on tyre choices.

http://www.4wdmonthly.com.au/forum/showthread.php?t=44058

Good luck mate.. tough decision.

AnswerID: 304493

Follow Up By: Member - Doug T (FNQ) - Sunday, May 18, 2008 at 17:47

Sunday, May 18, 2008 at 17:47

Hilux03

29 inch...31 inch.... mate you need to do some learning on measurements and tyre sizes and research and find out exactly what the 31 means .

Tyre Codes

Tyre size Calculator

The Mystical art of Tyre Reading

.

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Follow Up By: Member - Davoe (Yalgoo) - Sunday, May 18, 2008 at 18:54

Sunday, May 18, 2008 at 18:54

Whats that supposed to mean? I see nothin in his post that suggests he doesnt know the difference

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Follow Up By: Member - Doug T (FNQ) - Sunday, May 18, 2008 at 20:15

Sunday, May 18, 2008 at 20:15

Davoe
If you can't see the difference between a 15" a 16" to a Phantom 4x4 29" or 31" tyre then your just as silly, MAYBE he carries a ladder with him to get in ,
the 15" and 16" refers to wheel size, so if you want to believe he's using 29" or 31" wheels you better grab your useless next G phone and go hide yourself in that mine pit.

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Follow Up By: Member - Davoe (Yalgoo) - Sunday, May 18, 2008 at 20:38

Sunday, May 18, 2008 at 20:38

Dont know what your issue is both 29 and 31 inch tyres are available as are in fact 30 inch tyres.
there is absalutly nothing incorrect in his post and your personall attack for whatever reason has made you look silly

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Follow Up By: Member - Doug T (FNQ) - Sunday, May 18, 2008 at 21:20

Sunday, May 18, 2008 at 21:20

Davoe
This truck pictured has Michelin XDE2, 11R22.5. tyres, the 22.5 means inches , the tyre fits a 22.5 inch wheel , and your saying you buy or seen 31 inch tyres for a 4x4 , that would have to fit a 31 inch wheel , , I have an inkling to what your going on about but when I talk tyre size 16 0r 15 inch means wheel size , 31 inch is getting up to small dump truck sizes , bit like me calling a 4x4 a truck, absolutly NOT ON,

Image Could Not Be Found

Perhaps this one might your 4x4 Davoe, 59/80 R 63inch
Image Could Not Be Found

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Follow Up By: Member - Davoe (Yalgoo) - Sunday, May 18, 2008 at 22:11

Sunday, May 18, 2008 at 22:11

doug it is waht is on the tyres
16 inch tyres are gererally (not always) referred to as width- profile-wheel size in mm

eg 265(width in mm) 75 (profile as percentage of width) 16 (wheel size in inchs)

but you knew all that
what you dont seem to know is 15 inch tyres are generally (again not always) reffered to and marked on the sidewalls differently
for instance on the sidewalls of the missus hilux it says 30x9.5x15

(all in inches)
30 is the overall circumferance of the tyre 9.5 is the width and 15 is the wheel size

I cant believe you didnt know that.
If you dont believe me check out any older hilux ETC running 15s and read what it says on the sidewall before getting smart and abusive

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Follow Up By: Member - Doug T (FNQ) - Sunday, May 18, 2008 at 22:29

Sunday, May 18, 2008 at 22:29

Davoe,
As I said I had an inkling as to what you were on about, I'm a Truckie , retired and we refered to tyres as a truck has ie 10/00/20 , the old rag tyre , means cross ply , the 20 is inches , If i were to say to another truckie are those tyres 62 inch tyres ( just a guess of circumference) he would look at you as if your stone raving mad, and I,m not about to change my 40 years of habit to suit you or anyone else ,
As for being abusive , I don't I was abusive to you , if you want me to be abusive I can soon arrange that but I think my EO days would be numbered , calling someone silly , or suggesting they go get in a mine pit pit is not abusive in my opinion, , BUT to make sure you don't sulk for the next 2 weeks I'll say sorry , now dry the tears with a tissue ,

.

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Follow Up By: nickb - Sunday, May 18, 2008 at 23:21

Sunday, May 18, 2008 at 23:21

Generally, in "4x4 talk" tyre sizes are referred to by the overall diameter of the tyres. My patrol has 33" tyres on it, in 4x4 language that means the overall diameter is 33", ie. 33x12.5x15.

Seems logical as this is a 4x4/camping forum, not a trucking forum.

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Follow Up By: Member - Doug T (FNQ) - Sunday, May 18, 2008 at 23:30

Sunday, May 18, 2008 at 23:30

nickb
Yeh well you do it your , I'll do it my way , the 2 aint going to mix so I'll call it a close for me on the subject,
As for it being a 4x4 Forum , I;m a truckie . Davoe's in the Mine business, others in other professions , if you have to be in a 4x4 profession to be on the Forum then there's not going to be many left, I use my work experience to apply to my 4x4, gawd ...you could be a shrink for all I know , how would you use shrink ideas in a 4x4 ....lol

See ya

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Follow Up By: nickb - Monday, May 19, 2008 at 00:30

Monday, May 19, 2008 at 00:30

I think you missed the point. I wasn't trying to be an ass, but I'm sure most people on this forum would know what Hilux03 means when he said 31 inch tyre. Most people would say they have 31" tyres or whatever they have because thats how it is generally referred to when talking about 4x4s, not just by people in the 4x4 business.

I'm an electrician, if I asked my apprentice to get some 2.5, he would know I'm talking about 2.5mm2 Twin and Earth TPS cable. Someone else would have no idea what I was talking about. If I said I had 2" lift, most, if not all, here would know I am talking about a 2" suspension lift. Same as with the tyres on a predominantly 4x4 forum.

I have no idea about the trucking business so I don't know how they refer to tyres, your way makes sense. If you said to me you had 22" tyres on your truck, I would have thought "bloody hell, I've got bigger tyres on my Patrol!" until I read this post.

Glad I'm not a shrink hahaha!

Cheers
Nick

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Follow Up By: Member - Davoe (Yalgoo) - Monday, May 19, 2008 at 04:24

Monday, May 19, 2008 at 04:24

Its got zero to do with what trade your in or whether your a truckie or not or what your ways are

Its very simple you just read whats on the side of the tyre.

I recently bought tyres for my 4by and the misses and i know for my 4by i want 235x85x16 because it says so on the sidewall same as the missus tyres are 30x9.5x15
how the heck are you going to ask for them any other way?
I dont make it up i just follow the way it is
same as if i want skinnys i need to ask for 7.5x16
How else do you suggest the tyres get ordered?

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Reply By: Isuzumu - Sunday, May 18, 2008 at 16:53

Sunday, May 18, 2008 at 16:53

Go to www.exploroz.com/Vehicle/Tyres/SizeCalc.aspx
From what I can see the 215s are quite a bit smaller then the 30s

One for Hilux03, I run MTZs also but there are made by Coopers.

Cheers Bruce

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Reply By: Member - Doug T (FNQ) - Sunday, May 18, 2008 at 17:26

Sunday, May 18, 2008 at 17:26

Jeppie
What do you mean "came with" , I take it it was a second hand vehicle , if it is then new Hilux are fitted with 16" from factory,
If you replace them back to 16" then yes the economy will drop but not much, the best way to achieve economy is by using the cruise control on the end of your right leg.

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Follow Up By: Jeppie - Sunday, May 18, 2008 at 19:18

Sunday, May 18, 2008 at 19:18

Doug,
I will not be going back to a 16 inch tyre.
I was enquiring if there would be a difference in performance between a 30x9.5R15 and a 215R15.
I was quite happy with both the on and off road performance of the 30x9,9R15, but I was thinking of the change in size so that the tyres on the car and camper would be the same size.

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Follow Up By: Member - Doug T (FNQ) - Sunday, May 18, 2008 at 19:45

Sunday, May 18, 2008 at 19:45

Jeppie
You would notice a difference with 16" because it's like a higher gear basicly , not all that much , with 15" the engine does the job up hill for instance just a tad easier, if you measure from the axle dead center it's only half an inch gain in height,
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Follow Up By: nickb - Sunday, May 18, 2008 at 23:28

Sunday, May 18, 2008 at 23:28

Overall tyre diameter affects gearing, not wheel diameter. For example, a 15" wheel with a 35x12.5x15 (approx 35" diameter) tyre will make the engine "work harder" than a 16"wheel with 285/75/16 tyres (approx 33"diameter).

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Reply By: Member - Davoe (Yalgoo) - Sunday, May 18, 2008 at 19:04

Sunday, May 18, 2008 at 19:04

If you do a fai bit of 4bying then replace them with th 31x10.5. This will also give you the cheapest tyre options.
I recently had exactly the same dilemma as you and bought Maxis 751 tyres for $173 each . the 31s were $150 but then it wouldnt have fittedunder the carport also the missus didnt want to loose any fuel economy

AnswerID: 304539