boxerman83
Member Since: 04 Feb 2018
Location: Norwich
Posts: 2
  
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Hi all,
I'm new to 4x4 and off roading and need some advice. I've just picked up a Discovery 3 2006 tdv6 about a 2 months ago and used this forum for a few issues like resetting the xyz sensor and air suspension reconditioning and advice has been great.
Now my issue is I've just checked the spare wheel and it is a 19 inch and I have 20 inch wheels on my disco. I go off roaring with others who have defenders and discovery 2's and they are divided wether or not I would get wind up and damage my transmition if I were to use the spare as it's a Disco 3 and it has computer and probably does magic to compensate. I'm going to get another 20 inch ordered but now I've noticed it I will probably get a puncture as that's sods law and will be stuck out not knowing if I should put it on.
hope you can help and thank you 
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 14th Apr 2018 10:16 am |
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garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
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May cause some issues but windup is not possible when driving on the road with TR set to on road - maybe if you select Rock Crawl on hard surfaces where the centre diff is completely locked.
You need to check the rolling diameter of the 19" tyre against the 20" tyres and if they are the same no issue.
Where there may be issues if there is a huge difference is to the DSC/ABS/TC systems where differences in wheel rotation may activate different systems. Not sure how much a difference is needed but if large will cause problems with these systems but not windup.
Garry
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| 14th Apr 2018 10:51 am |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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I've driven offroad (in an emergency  ) on 2 x 18" scorpions , a space saver and a 19" MTR ....and then driven home 15 miles on them ...no issues  21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 14th Apr 2018 11:15 am |
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Erea
Member Since: 19 Mar 2012
Location: Munster
Posts: 1509
 
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What size Tyres have you 255/50/20 should be the same diameter as 255/55/19 so perfectly matched.
I have 255/55/19 on my D3 but currently the spare underneath is 235/70/17 which is the same diameter.
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| 14th Apr 2018 11:53 am |
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Ja92mie
Member Since: 16 Sep 2014
Location: Newquay
Posts: 1259
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I’ve got an 18inch as my spare but run 20s
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| 14th Apr 2018 12:14 pm |
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al cope
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10296
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As others have commented on, its not the wheel size that you need to look at, its the tyre size, as a 255/50x20 is the same rolling circumference as a 255/55x19 or a 255/60x18.
In fact the LR supplied standard skinny spare is a 19" skinny irrespective of the road wheel size.
Al Volvo XC90 B5 Plus Dark
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| 14th Apr 2018 6:11 pm |
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boxerman83
Member Since: 04 Feb 2018
Location: Norwich
Posts: 2
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Thanks all for your comments makes more sense and have learned about tyre dimensions and found tyre ratios match between the spare and the others
thanks again
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| 14th Apr 2018 8:48 pm |
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Erea
Member Since: 19 Mar 2012
Location: Munster
Posts: 1509
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Ja92mie wrote:I’ve got an 18inch as my spare but run 20s
I’m guessing 255/60/18? Which should be the same diameter as 255/50/20.
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| 15th Apr 2018 2:22 am |
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Ja92mie
Member Since: 16 Sep 2014
Location: Newquay
Posts: 1259
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Correct
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| 15th Apr 2018 7:53 am |
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