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jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28983
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Re: Thinking about oversized tyres on T31


Your fuel consumption shouldn't be impacted as the rolling dimater is the same (almost the same).

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5/Sep/2008, 11:02 pm Link to this post Send Private Message MSN Blog
 
whisk8 Profile
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Date Registered: 01-2008
Location: Darwin, N.T.
TOTAL POSTS: 74
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Re: Thinking about oversized tyres on T31


Fuel consumption seems about the same as far as I can tell, I guess the increased diameter thus lower revs compensate for the increased friction.

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Daniel
T31 ST-L Manual
7/Sep/2008, 12:11 am Link to this post Send Email PM   Send Private Message
 
PaulieT31TDi Profile
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Date Registered: 08-2008
Location: Brisbane
TOTAL POSTS: 54
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Re: Thinking about oversized tyres on T31


Have been looking at the BF Goodrich tyres myself. They specify the rolling diameter which when I divide by pi works out I can run a tyre legally that in theory shouldn't be.

The tyres on the TL (215/60 R17) calculated out to 690mm ([sign in to see URL]) so in theory 705mm is the legal maximum (taking QLD Transport at face value). When I go to the BF Goodrich site they list the 225/70 R16 (I will get a second set of rims) as a rolling diameter of 2188mm which works out to a diameter of [sign in to see URL]. Perfectly legal by my calcs BUT [sign in to see URL] (not legal) calculating the other way. I assume that the manufacturer knows what they are doing when they list the rolling diameter (which is what will effect my speedo)

Arghhhh.

Will have to ring my insurance company and see what they say.

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2008 TL 6 Speed Manual, Precision Grey. Tint, Rubber Mats, Towbar, Roofracks, 2 x Thule Bike Carriers
22/Sep/2008, 11:19 pm Link to this post Send Email PM   Send Private Message
 
tea4me Profile
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Date Registered: 09-2008
TOTAL POSTS: 7
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Re: Thinking about oversized tyres on T31


Hi all and thanks for your input, I've gone for a set of 225/65/17 Michelin Lattitudes which cost me £99 each ($185) so far so good!
5/Nov/2008, 12:30 am Link to this post Send Email PM   Send Private Message
 
Athandevel Profile
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Date Registered: 08-2008
TOTAL POSTS: 12
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Re: Thinking about oversized tyres on T31


Hi there,

I'm Athan and I'm a T31 [sign in to see URL] CVT owner.
I live in Greece where there are not any actual legal problems with oversized tires.
I want to increase the off-road capabilities of my T31 by using 50/50 All Terrain tires.
My problem is that there is nothing available in the stock 215/60/R17 size.
My next option is 225/60/R17 but the only tire available in this size is Yoko's GO12 AT-S.
If I go one more size up: 225/65/R17, there are also Pirelli's Scorpion ATR and Black-Star's Globe-Trotter (retread) available.

Now, if I'm right, in theory (since the stock size is 215/60/R17) a 225/65/R17 would cause a 4,78% decrease in force applied on the road: T=F*R > F=T/R (T=torque, F=force applied, R=radius).
Plus, an increase in tire diameter also means more mass in the periphery and inertia.

What's happening in practice though?
Would the use of the 225/65/R17 tires impact T31's power output noticeably?
Would I face power problems in hill climbing or mud "wrestling"?
Has anyone used any 225/65/R17 tires on petrol T31 in serious off-roading (within x-trail limits)?
Bottom line, would I regret it?

Many thanks in advance,
Athan

[url][sign in to see URL]
[url][sign in to see URL]
Globe-Trotter:
[sign in to see URL]

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x-1148
T31 Ti CVT
10/Feb/2009, 10:03 pm Link to this post Send Email PM   Send Private Message
 
cooch t31 Profile
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Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966
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Re: Thinking about oversized tyres on T31


Athan
Many T31 owners with 17' rims are having problems with buying A/T tyres for reasonable money here in Oz.
Some of them are considering dropping the rim size to 16' where there are many more choices for tyres.
See existing thread on replacement tyres.

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Tony X-891c

HERE is my D22 Navara
HERE is my old 2008 T31, ST Series1

11/Feb/2009, 6:02 am Link to this post Send Private Message
 
whisk8 Profile
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Date Registered: 01-2008
Location: Darwin, N.T.
TOTAL POSTS: 74
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Re: Thinking about oversized tyres on T31


Athan,

I use Cooper 235/65/R17s on my T31 and have used it offroad plenty.
I haven't noticed any decrease in torque, but I have no doubt that it is [sign in to see URL] maths doesn't lie. For me, this is easily offset by the larger 'footprint' I have on the ground, and the greater ground clearance (1in more than OEM tyre). You will encounter roblems with 'mud wrestling' but these are more caused by lack of engine power, and the ESP issue (plenty on that in other parts of the forum).

In short I think that 235/65/R17 size tyres are 'just right' for the T31 X-trail, I don't think you'll regret it. If you're getting large lugged tyres you might want to come to an agreement with the tyre provider about an exchange in the event that the lugs touch the wheel well when cornering - it's pretty tight in there!

Cheers,

Daniel

Last edited by whisk8, 27/Feb/2009, 9:05 pm


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Daniel
T31 ST-L Manual
11/Feb/2009, 12:23 pm Link to this post Send Email PM   Send Private Message
 
Athandevel Profile
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Date Registered: 08-2008
TOTAL POSTS: 12
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Re: Thinking about oversized tyres on T31


Thank you coochT31, whisk8,

CoochT31, I was also considering dropping my rims to 16", but the minimum cost of an alloy set in Greece, is around 900AUD! So, I have to try the overised options first.

Whisk8, Thanks for sharing your experience with me. Which type of Cooper 225/65/R17 do you use? Is it an A/T? Reading one of your previous posts I thought you're using some Cooper 235/65/R17?

Would any consider using retreads?

Cheers,
Athan

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x-1148
T31 Ti CVT
11/Feb/2009, 9:14 pm Link to this post Send Email PM   Send Private Message
 
clanXy Profile
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Date Registered: 01-2009
Location: near Geelong, Victoria
TOTAL POSTS: 10
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Re: Thinking about oversized tyres on T31


Hi. We also continue to ponder the whole AT Tyre issue for our T31 with 17inch rims. Has anyone actually replaced their 17inch alloy rims with 16inch steel ones? And if so, did you get new Nissan ones and how much were they? Our cheapest quote is $280, and there seems to be some angst among tyre dealers that the 16inch might interfere with the brake calipers. We have had no luck with trying to get non-nissan rims, either 16 or 17inch that fit!!

We need to take two spare wheels on our Kimberley trip and it's going to cost around $700 for the extra 17inch alloy, plus 6 new AT tyres!! Ouch! Probably go this way, but still want to know more about the reality of getting 16inch rims!!! And like the idea of a great choice of tyres.

By the way Cooper dealers are saying they do not have a tyre to fit our rims that are "legal" The 235/60/17 we are told, increase the diameter by 20 mm and the legal limit is 15mm. But we could risk it anyway?!

Looking froward to the ongoing discussion!!

Charles

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Charles :)
T31 Xtrail TS Diesel Manual White Dec 08
Alloy ECB Nudge Bar (black) Rhino Basket (Medium) Additional Spare (alloy 17") Yokohama Geolander A/T Tyres 225/60/17 Carpet Mats all round
13/Feb/2009, 2:30 pm Link to this post Send Email PM   Send Private Message
 
Athandevel Profile
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Date Registered: 08-2008
TOTAL POSTS: 12
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Re: Thinking about oversized tyres on T31


Hi Charles,

I thought in Australia, Nissan also offer the X-Trail with the 16" alloy option - which you would ultimately get as a spare part?
Have you tried the Dualis' 16" alloys? Maybe they fit?

In any case the A/T tyre issue is huge.
After reading your post I realized that 235/60/R17 could also be of an option.
In my country the only available A/Ts in 235/60/R17 are Cooper Discoverer ATR and TOYO Open Country A/T maybe in the future.

Of course the 16" alloys allow for more options but the 17" give better on-road handling and sense of steering.

It's a petty though our T-31 comes in this miserable 215/60/R17, when new RAV-4s, Grand Vitaras and CRVs all come in the much sexier 225/65/R17.

Cheers,
Athan

Last edited by Athandevel, 14/Feb/2009, 2:20 am


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x-1148
T31 Ti CVT
14/Feb/2009, 12:26 am Link to this post Send Email PM   Send Private Message
 


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