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ad07 Profile
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X-TRAIL NEWBIE
 


Date Registered: 08-2007
TOTAL POSTS: 13
Reply | QUOTE
New tyre size for 18's..??


Hi all. The Mrs is due for some new rubber on her T31 2010 Diesel Xtrail...currently sitting on the stock size 215/55-18 rubber. Looking to go for a 225/60-18 tyre. Was just wondering if anyone has done the same & had any issues at all.
I checked the tyre size calculator & overall height goes from 693mm to 726mm. Its not much of a change, I just didn't want any scrubbing on the guards .
Cheers,
Adam.
15/Mar/2018, 12:48 pm Link to this post Send Email PM   Send Private Message
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: New tyre size for 18's..??


Make sure also that she knows 100kph on the speedo will be about 105kph on the road because of the increased diameter

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
My Blog
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16/Mar/2018, 10:28 am Link to this post Send Email PM   Send Private Message Blog
 
ad07 Profile
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X-TRAIL NEWBIE
 


Date Registered: 08-2007
TOTAL POSTS: 13
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Re: New tyre size for 18's..??


Thanks Kev....will do. So you think the increased diameter will be ok??
16/Mar/2018, 11:35 am Link to this post Send Email PM   Send Private Message
 
momoxtrail Profile
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Date Registered: 06-2018
TOTAL POSTS: 18
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Re:



I run 225/55R18 on my 2.5L and as per door tag it is the stock dimension for 18 " .When I am at 100 km/h on the car speed dial, GPS reads 94 km/h

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T31 Series 3, QR25DE, M-CVT 4WD, SLX
K23 - Diamond Silver
225/55R18, Leather heated electric seats
Hyper roof rails, Xenon Headlamp
Built: 12:2012
16/Jul/2018, 5:30 pm Link to this post Send Email PM   Send Private Message Blog
 
ahto42 Profile
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Date Registered: 06-2012
Location: Estonia
TOTAL POSTS: 64
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Re:


I have 225/60/18 winter tyres. A bit softer ride and the speedo went for -7 to -4 km/h

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Member id X-2451
Name: Ahto
Location: Estona, Tartu

Model: T31 II 2012 Diesel Auto, LE
23/Jul/2018, 6:06 pm Link to this post Send Email PM   Send Private Message Blog
 
momoxtrail Profile
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Date Registered: 06-2018
TOTAL POSTS: 18
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Re:


From my calculations, 235/60 R18 will be closer for an accurate speedo reading....

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T31 Series 3, QR25DE, M-CVT 4WD, SLX
K23 - Diamond Silver
225/55R18, Leather heated electric seats
Hyper roof rails, Xenon Headlamp
Built: 12:2012
24/Jul/2018, 5:09 pm Link to this post Send Email PM   Send Private Message Blog
 
JLMUIR Profile
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X-TRAIL ENTHUSIAST
 


Date Registered: 01-2015
TOTAL POSTS: 187
Reply | QUOTE
Re:


I am pretty sure the width of the tyre (235) does not affect the speedo reading.

Cheers

John

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John - X-4060 (c)

T32 TL 4WD Gun Metal Grey
25/Jul/2018, 7:04 pm Link to this post Send Email PM   Send Private Message Blog
 
momoxtrail Profile
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Date Registered: 06-2018
TOTAL POSTS: 18
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Re:


Well,

235/60R18 gives a total diameter of 739.2 mm and rolling length of 2322.26 mm
225/55R18 diameter is 704.7 mm and rolling length of 2213 mm

Speedo reads the number of wheel turns so if the wheel is 'taller' the real speed will increase for the same number of turns compared to a 'smaller 'tyre....

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T31 Series 3, QR25DE, M-CVT 4WD, SLX
K23 - Diamond Silver
225/55R18, Leather heated electric seats
Hyper roof rails, Xenon Headlamp
Built: 12:2012
25/Jul/2018, 7:39 pm Link to this post Send Email PM   Send Private Message Blog
 


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