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20inch all round but 19inch spare
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LaserTam
 


Member Since: 31 Aug 2015
Location: Essex
Posts: 828

England 2012 Discovery 4 3.0 SDV6 HSE Auto Nara BronzeDiscovery 4
20inch all round but 19inch spare

I realise this would not be ideal, but any particular reason why I couldn't run a 19inch wheel to get me out of a predicament in an emergency?

I would be running the standard tyre sizes for both 20 and 19, so I'm thinking there shouldn't be an issue there. Got to be better than a space saver - that's my thinking.
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Post #21856019th Nov 2020 10:56 am
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DSL
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Ukraine 

It would depend if same rolling circumference, there are sites that let you compare one with t’other. Thumbs Up

https://tiresize.com/tyre-size-calculator/
  

Last edited by DSL on 9th Nov 2020 11:10 am. Edited 1 time in total 
Post #21856089th Nov 2020 11:09 am
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Motolab
 


Member Since: 18 Oct 2019
Location: Sleen
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Netherlands 2006 Discovery 3 TDV6 HSE Auto Zambezi SilverDiscovery 3

the (Lim slip?) differentials will be overheating very quick if the circumference of one of the tyres are very different..

rim size in itself is not important, circumference of the tyre is IMHO.. so have that within very very narrow limits, not a big issue for limited use

if bigger difference...
i one mile on a greenlane dangerous? i tempt te believe not... 10mls? or 20? but then another 20 or more getting home on a sunday, and on monday another few miles to the tyre fitter?

hmm i would not take the risk, but that is me..
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Last edited by Motolab on 9th Nov 2020 11:10 am. Edited 1 time in total 
Post #21856099th Nov 2020 11:09 am
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DSL
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What are the 2 sizes?
   
Post #21856119th Nov 2020 11:10 am
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Oswiperus
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Member Since: 02 Apr 2010
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United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

Provided that they are 255/50/20 & 255/55/19 then they are standard size with same rolling radius so the 19" will be fine to use as spare.
 Stu

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Post #21856139th Nov 2020 11:16 am
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CongoBoy
 


Member Since: 05 Mar 2019
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Zimbabwe 2009 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

My FFRR Supercharged has 20 inch 255/50/R20 but I have 19 inch 255/55/R19 as a spare.
It is compatible but I would only use as a get-out-of-jail-for-free card.
The overall diameter is the same BUT there are slight differences
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Post #21856149th Nov 2020 11:17 am
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DSL
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I doubt the diff or electronics would even notice.

Click image to enlarge


IMHO would be fine until the punctured 20 is either fixed or replaced. OK one has a slightly bigger side wall so a bit more flex but I doubt that the car could get to conditions where that would make a difference.
   
Post #21856339th Nov 2020 12:30 pm
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LaserTam
 


Member Since: 31 Aug 2015
Location: Essex
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England 2012 Discovery 4 3.0 SDV6 HSE Auto Nara BronzeDiscovery 4

Thanks for the replies.

Oswiperus wrote:
Provided that they are 255/50/20 & 255/55/19 then they are standard size with same rolling radius so the 19" will be fine to use as spare.


Yes, that is what I meant by standard tyre sizes, so that the rolling circumference would be the same/very similar. As I said, if I used the space saver, it would be the same situation in my view.
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Post #21856369th Nov 2020 12:49 pm
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Russell
 


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Yes space saver would be the same and that was specified by LR Whistle
Many on here have done what you are planning on doing, I have, but thankfully never had to use it. Would only use it to get me somewhere to get the other repaired or replaced so not a long distance
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Post #218580110th Nov 2020 12:26 am
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DG
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About 14 years ago, after blowing two tyres in 100 yards on a nasty flint laden lane, I ran for about 10 miles on 2 x 18s, a 19 and a space saver to get back home...no lasting issues Thumbs Up
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Post #218580210th Nov 2020 12:47 am
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Admirable
 


Member Since: 19 Jul 2015
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Ukraine 2007 Discovery 3 TDV6 XS Auto Zermatt SilverDiscovery 3

You must always make sure that tyres on the same axle are of the same size and aspect ratio, your car would fail an MOT test if they’re not but the law makes an exception for temporary use spare wheels fitted in an emergency.
  
Post #218580810th Nov 2020 5:22 am
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riverblanche
 


Member Since: 31 Aug 2010
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England 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Hi,
just to give an alternative view Whistle

I used to run a full size spare, but with the same type of tyre as I was running on the car
so if I did get a puncture, it could be fixed "at my leisure" and put back in the boot, again at leisure could decide where it was going to go back on the car or it may stay in the boot till next time Shocked

IF

you are only going to use it as an emergency get you to the next tyre garage,
then why not just stick with a space saver Question you can still legally tow on them and stuff.
if you have a full size 19" already then fair enough.

Just another point of view

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Post #218597010th Nov 2020 8:13 pm
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Dondiddy
 


Member Since: 26 Dec 2019
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United Kingdom 2015 Discovery 4 3.0 SDV6 HSE Lux Auto Yulong WhiteDiscovery 4

Loads of people run about for months/hundreds of miles on space savers at well above the recommended max speed limits for them with no adverse affects on the vehicle other than wearing out the tyre! It comes from running a car on a shoestring budget or not realising /caring that the spacesaver is only really meant to get you to the nearest tyre services to have your punctured tyre repaired!
  
Post #218598110th Nov 2020 8:58 pm
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notyalc
 


Member Since: 07 Mar 2020
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United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Santorini BlackDiscovery 4

Yes but they are generally only 2 wheel drive....

Going back to the op, I can’t see a problem if used as a spare.
  
Post #218628311th Nov 2020 8:03 pm
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