Advertise on DISCO4.COM
Forum · Gallery · Wiki · Shop · Sponsors
  Home · FAQ · New Posts · My Posts · PMs · Search · Members · Members Map · Groups · Profile · Donate · Register · Log In  
DISCO4.COM > IIDTool Help

I've just fitted some new wheels & tyres ...
Post Reply  Down to end
Page 1 of 1
Moleshome
 


Member Since: 15 Oct 2020
Location: Wokingham
Posts: 412

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Yulong WhiteDiscovery 4
I've just fitted some new wheels & tyres ...

I've gone from the original 255/50R20 to 265/65R18.

I've seen various posts about updating the CCF with the new size but is it necessary?

I've not changed it at the moment and whereas the speed was always about 3mph off compared to GPS (on a straight, level road) it now appears to be absolutely dead on.

Other than the speed is anything else affected by the tyre size in the CCF?  
Post #231475712th Nov 2022 6:46 pm
View user's profile Send private message View poster's gallery Reply with quote
LeighW
D3 Decade 


Member Since: 31 Jan 2006
Location: Brisbane, AUS
Posts: 916

Australia 2006 Discovery 3 TDV6 S Auto Bonatti GreyDiscovery 3

Some time ago I did a spreadsheet to compare original with proposed tyre size changes.

I plugged your figures in and here is the result.


Click image to enlarge


Hope this helps. LeighW

The old girl is on her third engine...
* first ran a bearing (design failure in original engine)
* second had a failure of the water outlet on top of the engine (pls check yours)  
Post #231481213th Nov 2022 2:24 am
View user's profile Send private message View poster's gallery Reply with quote
kajtzu
 


Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6566

Finland 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

I approve the use of excel Thumbs Up Thumbs Up Thumbs Up

If one wouldn’t want to reinvent the wheel, https://tiresize.com/calculator/ allows similar comparisons between two different sizes. Whistle  
Post #231482113th Nov 2022 10:39 am
View user's profile Send private message View poster's gallery Reply with quote
Moleshome
 


Member Since: 15 Oct 2020
Location: Wokingham
Posts: 412

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Yulong WhiteDiscovery 4

Sorry, perhaps I haven't explained it very well.

I know how much larger the new wheels/tyres are but if anything the speedo is more accurate now even though I haven't changed the size in the CCF.

The question is whether I'll see any adverse effects elsewhere by leaving the setting as they are rather than 'correcting' them?  
Post #231488113th Nov 2022 7:21 pm
View user's profile Send private message View poster's gallery Reply with quote
Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10360

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Just leave it. Thumbs Up  
Post #231488313th Nov 2022 7:31 pm
View user's profile Send private message View poster's gallery Reply with quote
Moleshome
 


Member Since: 15 Oct 2020
Location: Wokingham
Posts: 412

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Yulong WhiteDiscovery 4

Thanks Pete Very Happy  
Post #231488413th Nov 2022 7:33 pm
View user's profile Send private message View poster's gallery Post Reply
Display posts from the last:  
Post Reply Back to top
Page 1 of 1
Jump to:  
< Previous Topic | Next Topic >


Posting Rules
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum



DISCO4.COM Copyright © 2004-2024 Futuranet Ltd & Martin Lewis
DISCO3.CO.UK RSS Feed - All Forums
DISCO4.COM is independent and not affiliated to Land Rover.
Switch to Mobile Site