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Tyre Rolling Radius
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crooks_uk
 


Member Since: 04 Jul 2017
Location: Newcastle-upon-Tyne
Posts: 42

Tyre Rolling Radius

Just changed to 275/55r20 mud tyres. Does anybody know the correct rolling radius setting value to use? Tyres are 811 mm in diameter. Do I just halve this value or is there more to it?
  
Post #226280817th Nov 2021 5:52 pm
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NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10844

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

Look here:-

https://www.tyresizecalculator.com/tyre-wh...dimensions

NJSS
 Am I Gammon or Woke ? - I neither know nor care.

2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
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Post #226282317th Nov 2021 7:13 pm
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crooks_uk
 


Member Since: 04 Jul 2017
Location: Newcastle-upon-Tyne
Posts: 42


Is it as simple as using half of the new tyre diameter? 405 in this case?
  
Post #226282717th Nov 2021 7:17 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8244

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

That I don’t know from memory, but if you scroll down the potions on the Iid tool it will give options in tyre sizes, I don’t know if your size is there but to check your choice simply drive through a digital speed sign Thumbs Up
If the sizes on the Iid tool are circumference mm you need 2547mm for new tyres in your size.
255x55x19 = 2400.
 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #226283817th Nov 2021 8:02 pm
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galwaygreen
 


Member Since: 30 Oct 2011
Location: plymouth
Posts: 6525

United Kingdom 2016 Discovery 4 3.0 TDV6 Graphite LE Auto Loire BlueDiscovery 4

interesting link NJSS...thank you....8 feet in one rev... surprising
  
Post #226287818th Nov 2021 12:11 am
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