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Changing tyre profile size
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Member Since: 07 Feb 2012
Location: East Midlands
Posts: 182

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
 2016 D4 HSE Silver with Black Pack
2016 Baby RR (Evoque) swmbo's - love's it
2014 D4 HSE - gone
2013 D4 HSE - gone
2011 D4 Commercial - gone 
 
Post #18645854th Oct 2017 8:02 am
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F355GTS
 


Member Since: 10 Nov 2008
Location: North Hampshire
Posts: 695

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: 8420

England 2016 Discovery 4 3.0 SDV6 SE Tech Auto Loire BlueDiscovery 4

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
 MY16 D4 SE Tech, Loire Blue, Almond Leather, Privacy, plus some other goodies.
Old - MY12 D4 SDV6 XS Auto - Ipanema Sand with Almond Leather - Plus other niceties, and D4.com sticker
Older - D3 TDV6 XS Auto - Lugano Teal with Almond Leather, 20" Stormers, Shiny Tailpipes, DVD/TV - and obligatory D3 sticker
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Post #18646254th Oct 2017 9:36 am
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Member Since: 07 Feb 2012
Location: East Midlands
Posts: 182

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.
 2016 D4 HSE Silver with Black Pack
2016 Baby RR (Evoque) swmbo's - love's it
2014 D4 HSE - gone
2013 D4 HSE - gone
2011 D4 Commercial - gone 
 
Post #18646404th Oct 2017 10:34 am
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ronp
 


Member Since: 29 Nov 2006
Location: 🌲North Yorkshire🌲
Posts: 12704

Scotland 

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.

Thumbs Up
 🍊..... with added ORANGE bits 🍊  
Post #18646514th Oct 2017 11:16 am
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