Slug
Member Since: 07 Feb 2012
Location: East Midlands
Posts: 347
  
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| Changing tyre profile size |
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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
2019 Baby RR First Edition
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 4th Oct 2017 8:02 am |
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F355GTS
Member Since: 10 Nov 2008
Location: North Hampshire
Posts: 849
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Why change? Mark
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| 4th Oct 2017 9:01 am |
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al cope
Member Since: 08 Nov 2005
Location: Oldbury, WM
Posts: 10359
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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 Volvo XC90 B5 Plus Dark
Gone - MY18 D5 HSE - Corris on 22's with Black Pack
Now gone - 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
Ancient - D3 TDV6 S - Tonga with Ebony, 20" Stormers, satnav & DVD
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| 4th Oct 2017 9:36 am |
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Slug
Member Since: 07 Feb 2012
Location: East Midlands
Posts: 347
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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
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| 4th Oct 2017 10:34 am |
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ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15269
 
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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.
 ...... always on the road less travelled 🚧
< ‘tis but a mere scratch …….. it’ll polish out.
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| 4th Oct 2017 11:16 am |
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