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Changing tyre profile size
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Member Since: 07 Feb 2012
Location: East Midlands
Posts: 346

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Indus SilverDiscovery 4
Changing tyre profile size

255/50R20 - 255/55R20
Needing some new tyres, so thinking I will probably go for 255/55-20 from my 255/50-20.
Question is - do I need to change the spare as well.
Also if I do change the spare will the new sized tyre fit within the plastic cover that LR fit underneath a MY16D4
Cheers
 Still lurking, although moved to the dark side: disco5.co.uk
2019 D5 HSE
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Post #18645854th Oct 2017 8:02 am
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F355GTS
 


Member Since: 10 Nov 2008
Location: North Hampshire
Posts: 849

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Buckingham BlueDiscovery 4

Why change?
 Mark  
Post #18646144th Oct 2017 9:01 am
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al cope
 


Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10289

England 

yes you can go up in profile, and yes it would be advisable to have the spare with the same profile as otherwise you will run (if spare fitted) 2 tyres on the same "axle" that have 2 different circumference measurements. This means one will be doing more revolutions per mile than the other.

As for the bigger profile fitting underneath - yes, ths fits. I have 275x45x21 (so the same size diameter as 255/55x20) under the back of mine.

Al
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Post #18646254th Oct 2017 9:36 am
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Member Since: 07 Feb 2012
Location: East Midlands
Posts: 346

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Indus SilverDiscovery 4

Cheers Al,

Reason I'm wanting a change, is really just that I'm wanting a larger profile for a better ride. more protection from kerbs/off road etc.
and the GG AT3 seems the best fit for purpose.
 Still lurking, although moved to the dark side: disco5.co.uk
2019 D5 HSE
2019 Baby RR First Edition 
 
Post #18646404th Oct 2017 10:34 am
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ronp
 


Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15208

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

al cope wrote:
..... 2 tyres on the same "axle" that have 2 different circumference measurements. This means one will be doing more revolutions per mile than the other.


The D4 may also detect this and [for safety reasons] not automatically shift up beyond 3rd gear.

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Post #18646514th Oct 2017 11:16 am
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