AUSTRALIAN X-TRAIL FORUM :: Wheels & Tyres :: 17" tyres for T31's.

Australian X-Trail Forum Wheels & Tyres
17" tyres for T31's.

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jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 29094

Re:

When you convert to 16" wheel and tyres you will be able to use the spare as any other normal tyre. It is speed rated at the moment to 80kms/hour because it's a different size than you other wheels.

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2/Jun/2011, 7:15 am

ExyCol Profile
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X-TRAIL ENTHUSIAST

Date Registered: 09-2006
TOTAL POSTS: 116

Re:

Just to give some idea on what I did with the 17" setup.

I ended up taking the car the day after it rolled out of the dealers straight down to the tyre shop and had them fit Cooper's AT/Rs - 235/60 R17 size. Best part is the tyre shop gave me some money back for the factory tyres, bringing down the price of the Cooper's quite a bit.

Only have now done something about the spare to bring its size up a bit as well. Had another Cooper AT/R fitted in there - 215/70 R16 size. This does fit in the spare tyre well with a few mm's either side. Its important to note that the Cooper 235/60 R17 did not fit in the tyre well.

This supposedly brings the spare size closer to size to the main tyres size than what the factory setup had, as well as fitting a normal use tyre - hopefully this should allow full speed driving and towing on the spare tyre.

It's probably important to note that with the Cooper AT/R in the 235/60 R17 size, the diameter of the tyre is slightly higher than other 235/60 R17 tyres - 721mm in the Coooper vs 714mm for the standard size.

I also suspect you could possibly fit a 225 sized tyre in the spare tyre well, but a 235mm might be a bit too wide for the tray/luggage boards.

Basically, I think if you go for one of the other brands in a 235/60R17 sized tyre (that has a standard 714mm diameter) and the 215/70R16 in the spare (708mm diameter), then you should have a good setup without too much worry - particularly once your main tyres wear down a bit - then the diameters should be perfectly matched.

30/Aug/2011, 10:54 pm

Translucidus Profile
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X-TRAIL LEGEND

Date Registered: 05-2010
Location: Adelaide
TOTAL POSTS: 599

Re: 17" tyres for T31's.

Bet they look awesome - pics please emoticon

Should be good as long as you don't believe your speedo - might pay to compare it with GPS speed readout!!! emoticon

Last edited by Translucidus, 31/Aug/2011, 9:28 pm

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2007 X-Trail T31 ST-L

Xy going vertical at Bendleby Station . . .

31/Aug/2011, 9:23 pm

ExyCol Profile
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X-TRAIL ENTHUSIAST

Date Registered: 09-2006
TOTAL POSTS: 116

Re:

Even after the tyre change, the speedo still reads too slow!!! I've setup the scangauge now to give an accurate speed reading.

2/Sep/2011, 2:16 pm

cooch t31 Profile
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X-TRAIL HOLIC

Date Registered: 06-2008
Location: Blue Mountains, NSW
TOTAL POSTS: 5966

Re:

It should only read about 2 or 3kms slower with the taller tyres.

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Tony X-891c

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

2/Sep/2011, 5:07 pm

ExyCol Profile
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X-TRAIL ENTHUSIAST

Date Registered: 09-2006
TOTAL POSTS: 116

Re:

Yep, thats about right. Scangauge itself required a 7% adjustment to get it spot on as well.

I'm pedantic about getting the speed spot on - I use cruise control a lot and like to sit at exactly the speed limit, not 2KM/Hr slower. The police are also pedantic - they'll book you for as little as 5KM/Hr over the limit...

2/Sep/2011, 5:23 pm

Translucidus Profile
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X-TRAIL LEGEND

Date Registered: 05-2010
Location: Adelaide
TOTAL POSTS: 599

Re: 17" tyres for T31's.

Scangauge would work off car internals and so would also be affected by larger diameter tyres same as speedo..

Only accurate way to tell true speed is a radar unit or GPS whilst driving on a flat (horizontal) road.

According to http://www.csgnetwork.com/speedocalibcalc.html going to 235 from 215 gives +2km/h at 60, +2.8 at 80km/h and +3.5 at 100km/h

Given the Coopers are larger diameter (28.2 " = 716.28 mm) due to thicker tread, the Speedo is actually probably very close to accurate (you would need a 245/60 17" with 726mm diam to read 105km/h at a true 100km/h).

I usually check speed with my GPS as I know it's accurate and the Xy speedo is not all that easy to read accurately.

T31 Speedo is designed to read 5km/h slow at all speeds but odometer is very accurate with standard tyres.

Please let us all know what you think of the 235 Coopers as I'll be needing my first set of replacement tyres soon and was considering them.

Interestingly you will be going 103.5 kms for every 100 kms indicated on odometer when using larger tyres.

Last edited by Translucidus, 2/Sep/2011, 5:52 pm

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2007 X-Trail T31 ST-L

Xy going vertical at Bendleby Station . . .

2/Sep/2011, 5:39 pm

Robbo0001 Profile
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BANNED USER

Date Registered: 07-2008
Location: Brisvegas, Australia
TOTAL POSTS: 1063

Re: 17" tyres for T31's.

quote:
Scangauge would work off car internals and so would also be affected by larger diameter tyres same as speedo..

Scanguage allows you to add or subtract speed variations, depending on different car set ups like tyres and rims.

Mine is set at "plus 5" in the XTrail so the Scanguage and GPS read spot on, and the speedo can do whatever it wants.

If the cops get me for 3 kms over...so be it. Will be a slow day on the road when they do. Been two years or so now, and no problems at all with tyre size and speed.

The Scanguaage is definately worth its weight in gold, for diagnostics and vehicle statistics alone.

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Dave
99 GU Patrol 2.8TD
Ex-2002 T30 TI Xtrail

2/Sep/2011, 6:00 pm