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xtrailing Profile
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Date Registered: 02-2005
Location: Geelong, Victoria
TOTAL POSTS: 190
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Re: Replacement Tyres


Its more to do with the rolling diameter of the tyre than the actual rim diameter. A lower profile 17 can have the same rolling diameter as a high profile 15. ADRS permit up to 10% speedo error & manufacturers usually er on the side of caution, making the speedo read lower than your actual speed. By fitting the larger rolling diameter tyre it can help to correct this discrepancy
4/Apr/2005, 9:04 am Link to this post Send Email PM   Send Private Message
 
David M Profile
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Date Registered: 02-2005
Location: Taylor's Hill (Melbourne)
TOTAL POSTS: 466
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Re: Replacement Tyres


With the standard tyres (now at 40,000kms) the speed check over the bridges at two different locations showed 97kph when the speedo showed 100. 3% on the safe side (Victoria Police and speed cameras are not as forgiving as the ADR's) I can live with. emoticon

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David M (X095)

ST Auto (series 1) 180,000 kms
Nissan nudge, fog lights, towbar, floor mats, K&N filter, Cooper CS4s, electric trailer brake controller, GME TX3220
4/Apr/2005, 9:13 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28983
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Re: Replacement Tyres


quote:

xtrailing wrote:

Its more to do with the rolling diameter of the tyre than the actual rim diameter. A lower profile 17 can have the same rolling diameter as a high profile 15. ADRS permit up to 10% speedo error & manufacturers usually er on the side of caution, making the speedo read lower than your actual speed. By fitting the larger rolling diameter tyre it can help to correct this discrepancy



Hi xtrailing,

I'm now shopping around and re-searching 16" tyres to fit the new alloys that I recently bought.

I looked at the tyre size you currently have, but when I run this size against the OEM ones (215/65/16) using the Size Calculator it gives me a result saying it is outside of the recommended 3% diameter change and the speedo reading will be 5.1% too slow.

Is this a problem?



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10/Apr/2005, 2:15 am Link to this post Send Private Message MSN Blog
 
jalalski Profile
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28983
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Re: Replacement Tyres


Hi Guys,

I'm now looking at buying 16" tyres to suit my new set of rims and I have looked through our forum, Richi's list as well as on the net and have narrowed down my chioce to 2 tyres (this was based on my driving pattern, as I'll be doing more on road drving than off road)

1. Pirelli Scorpion S/T (70% on road, 30% off road)

2. Dunlop Grandtrek AT2 (50% and 50%)

I like the look of the Pirelli's though emoticon

Have narrowed down the approx. cost of the Dunlop ones to about $220/tyre (with no shopping around done yet), but I couldn't get the price of the Pirelli's. Does anyone know?

P.S. The above 2 tyres are the exact size replacement of the standard OEM ones (215/65/16)

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10/Apr/2005, 2:32 am Link to this post Send Private Message MSN Blog
 
xtrailing Profile
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Date Registered: 02-2005
Location: Geelong, Victoria
TOTAL POSTS: 190
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Re: Replacement Tyres


Jalal, please note that the rolling diameter of tyres will vary from brand to brand, so you should never put 2 new tyres on either end of an AWD, as it can also possibly have the effect of confusing the electronics making it think it has slip at either end of the vehicle thus locking the coupling when auto is selected. The tyre calculator you used to compare tyres said 225/70/16 tyres have a rolling diameter of [sign in to see URL] where as my BF Goodrich are actually 734mm diameter which puts the speedo out by approx 7.5% by the tyre calculator? over the standard tyres! I wanted the larger diameter for better ground clearance & as I've stated before had such a good run from goodrich tyres previously. I have tried to get the rolling diameter of the standard bridgestones to compare but not many tyre sites on the net give rolling diameters except BFG. Would be very interested to find standard dia to compare to tyre calculator, maybe in your search for new tyres you could ask the dealers & let us know. Good luck in your quest it can be confusing who to believe!

Cheers Phil
10/Apr/2005, 8:14 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28983
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Re: Replacement Tyres


Hi Phil,

I also want to buy a larger tyre if I can, but I don't want to compromise the speedo reading and put it out of wack so much.

I have used 2 tyre size calculators when I compared the (215/60/16) standard size tyre against (225/70/16) as the new tyre and both of them suggested that the standard rolling diameter for the standard tyres is [sign in to see URL] while the new tyre size comes-up as having [sign in to see URL]

This will affect the speedo reading and the result given suggestes that a speedo reading using that standard OEM tyre size of 100Kmph would be translated to [sign in to see URL] using the larger tyre (that's a fair bit out of wack)

]HERE is the other tyre size calculator I used.

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10/Apr/2005, 8:40 am Link to this post Send Private Message MSN Blog
 
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Date Registered: 02-2005
Location: Geelong, Victoria
TOTAL POSTS: 190
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Re: Replacement Tyres


Jalal I checked my speedo reading using the speed checker on the Princes Hwy between Melbourne & Geelong & it suggests my speedo is reading 100 at 100 (how accurate are these?). Remember your speedo maybe & probably is reading under. Has the same effect on economy readings!! Just found on the toyo web site tranpath 215/65/16 has a rolling dia of 686mm. Means mine are 7% greater in rolling dia than these! Means your tyres are 21mm larger than the tyre calculator also!!

Cheers Phil
10/Apr/2005, 9:01 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28983
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Re: Replacement Tyres


Phil,

My speedo is spot on at the moment and I have checked it against the distance/speed markers on the highway (also not sure how accurate are these)

If you're saying that your speedo is reading correctly with this size of tyres I can only trust what you're saying and this is turn makes it even more confusing for me to select my new tyres emoticon

Have you tried driving with a handheld GPS on board to see what speed reading it gives you?

Do you have a photo of them on your exy?

Last edited by jalalski, 10/Apr/2005, 11:02 am


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10/Apr/2005, 10:53 am Link to this post Send Private Message MSN Blog
 
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Date Registered: 02-2005
Location: Geelong, Victoria
TOTAL POSTS: 190
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Re: Replacement Tyres


Haven't tried with GPS on board. Have photos under xtrailing mods. Also on yahoo groups australian xtrail site I have more pics of vehicle. Tyre debate is very confusing isn't it! I have driven 4wd's for over 20 years & it made for long debate sessions around the fire!
10/Apr/2005, 11:17 am Link to this post Send Email PM   Send Private Message
 
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Date Registered: 02-2004
Location: SUTHERLAND, SYDNEY
TOTAL POSTS: 28983
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Re: Replacement Tyres


Hi Phil,

Yes, it's so confusing that I just went-out and bought the 1st set of tyres I could find LOL =D

Check them-out (they do look good though with the new rims)

Don't ask me about the brand, as I couldn't find it written on the tyres emoticon

in or sign up to see linked image content--

    

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