↓ Advertise on Defender2 ↓

Home > Wheels & Tyres > Running on Different Spare Wheel!
Post Reply  Down to end
Page 1 of 3 123>
Print this entire topic · 
K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Running on Different Spare Wheel!
Something got me pondering today.....

I would if possible like a definitive answer and not 'doom mongering' speculation! Due to availability and cost I have a standard Boost spare wheel. Now according to my calculations and the chart reference Fekete kindly gave me, my rolling radius of this spare wheel is 4.2% smaller than my other wheels.

Here is the crunching question:-

In the event of me having to fit said wheel what are the implications regarding potential differential damage/ABS operation and such like?

Is it suitable as a get-you-home option?

Thank you. Thumbs Up If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #27484 19th Mar 2010 6:39pm
View user's profile Send private message View poster's gallery Reply with quote
fekete



Member Since: 24 Dec 2008
Location: Here on the other end of the computer
Posts: 3626

United Kingdom 2007 Defender 90 Puma 2.4 HT Bonatti Grey
Mal just worked it out and i think there is only 2mil in it i would say that would get you home but maybe ken or one of the other tyre guys AJS4x4 on here might be better at answering this for you as you really need to find out for sure Thumbs Up

Stock tyre 31.7
new tyre 31.5 NEVER TAKE LIFE SERIOUSLY. NOBODY GETS OUT ALIVE ANYWAY


Last edited by fekete on 19th Mar 2010 7:13pm. Edited 2 times in total
Post #27486 19th Mar 2010 6:54pm
View user's profile Send private message View poster's gallery Reply with quote
K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Get You Home Options!
Could get a repair option like I've got with my motorcycle but you need to know where it's punctured to fix it. Even a can of the repair Censored may do as a temporary measure, but knowing I still have the spare as a last resort would be comforting.
If I can source another Mach 5 I may buy it but will have to wait a while.

Waiting for 'Victor' to show up and tell me my diffs will melt into a molten blob after a mere 50 centimetres of travel.

Gotta laugh....Rolling with laughter Rolling with laughter Rolling with laughter Rolling with laughter

You're right Ken sprung to my mind as well. Was going to 'pm' a few individuals but thought there may be others in a similar situation.

Dog Thumbs Up Dog If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!


Last edited by K9F on 20th Mar 2010 8:33am. Edited 1 time in total
Post #27487 19th Mar 2010 7:03pm
View user's profile Send private message View poster's gallery Reply with quote
fekete



Member Since: 24 Dec 2008
Location: Here on the other end of the computer
Posts: 3626

United Kingdom 2007 Defender 90 Puma 2.4 HT Bonatti Grey
Come on Victor Don't let us 2 down Rolling with laughter Rolling with laughter

Stock tyre 31.7
New tyre is 31.5 i think you would be fine Thumbs Up NEVER TAKE LIFE SERIOUSLY. NOBODY GETS OUT ALIVE ANYWAY
Post #27489 19th Mar 2010 7:07pm
View user's profile Send private message View poster's gallery Reply with quote
MuddyMarky



Member Since: 01 Feb 2010
Location: Oxfordshire
Posts: 548

United Kingdom 2011 Defender 110 Puma 2.4 DCPU Stornoway Grey
Get a 5th on the back there! It'd look great, although with the extra length added to the truck, you might need a different category on your driving licence! (and I don't think the OE wheel cover would still fit!)

Rolling with laughter Mark
2011 110 XS DC
Stornoway Grey
Post #27493 19th Mar 2010 8:17pm
View user's profile Send private message View poster's gallery Reply with quote
discocuzzy



Member Since: 16 Jul 2008
Location: surrey
Posts: 1200

England 
Im with Marky....dont be a tight git mal and get the cheque book out for the 5th wheel Very Happy You cannot teach stupid people to do clever things
Post #27512 19th Mar 2010 11:27pm
View user's profile Send private message View poster's gallery Reply with quote
K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Last 4.
Disco me ol' matey I had the last four from Devon in that size and had searched for ages before they had a stock reconciliation and discovered they had 'em!
That said anyone got a 10x15 Mach 5 wheel 'second generation' with the rolled over edges they are willing to part with 'pm' me! TVM! If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #27527 20th Mar 2010 8:39am
View user's profile Send private message View poster's gallery Reply with quote
fekete



Member Since: 24 Dec 2008
Location: Here on the other end of the computer
Posts: 3626

United Kingdom 2007 Defender 90 Puma 2.4 HT Bonatti Grey
Mal if you have no look the other option is a 10/15 modular for a spare Thumbs Up NEVER TAKE LIFE SERIOUSLY. NOBODY GETS OUT ALIVE ANYWAY
Post #27528 20th Mar 2010 8:59am
View user's profile Send private message View poster's gallery Reply with quote
K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Good Idea!
Good idea Fekete,

Shall await to see if I can get a definitive anwser! If I can run with the Boost spare the £200 odd quid for the modular and tyre would buy me something else for it! For example a Mantec or Safari Snorkel! Priority next MUST be Rustmaster, am desperately trying to resist splashing on more 'bling!' Got a saint on one shoulder and a devil on t'other, each with their own agenda!
Evil or Very Mad Dog Thumbs Up If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #27533 20th Mar 2010 10:40am
View user's profile Send private message View poster's gallery Reply with quote
ken



Member Since: 18 Aug 2009
Location: Banging Birds with my bitches !!
Posts: 4328

United Kingdom 
The Official and correct advice is never run a wheel/tyre combo with a different rolling radius on the same axle at all this also applies to a new tyre old tyre tread patterns (AT MT etc) directional mixed with Omi’s
That said I’ve seen plenty that do it’s your truck so your decision, you also need to define “get you home”
How long is that from Morocco or 10miles ?
Me I always have the correct size available to me plus one ready in the WS plus a few extras
Post #27535 20th Mar 2010 11:16am
View user's profile Send private message View poster's gallery Reply with quote
RED-DOT



Member Since: 29 Jun 2009
Location: stirling
Posts: 2363

Scotland 
I always thought the differential would be OK to run different sized tyres as it compensates for turning and spinning with no trouble at all. Where you may experience diff wind-up is on hard surfaces with the diff lock engaged. Using a larger or smaller tyre as a spare will cause no harm unless you try to do doughnuts on a dry road. Normal driving will do no harm at all. 2008 RS4 gone, 123d M Sport, and a Puma 90 XS..
Post #27540 20th Mar 2010 12:38pm
View user's profile Send private message View poster's gallery Reply with quote
K9F



Member Since: 12 Nov 2009
Location: Bournemouth
Posts: 9610

United Kingdom 2008 Defender 90 Puma 2.4 XS CSW Stornoway Grey
Thank you, the last two posts are very clearly defined, comprehensive but completely at odds! I must admit Red Dot's is more comforting and the points about turning and spinning make perfect sense! Nevertheless I am still unsure, it shows how 'undefined' this issue is!
My interpretation of 'get you home' would be to the next tyre dealership or maybe 100 - 150 odd miles if I had to put a distance on it!
In mitigation in nearly 30 years of driving I have only had to fit a spare away from home twice. I may seek solace from that and stick with the Boost!
Windscreens on the other hand is a totally different saga I could do with carrying one of those with me as a spare! Rolling with laughter If you go through life with your head in the sand....all people will see is an ar5e!!

Treat every day as if it is your last....one day you will be right!!
Post #27553 20th Mar 2010 5:00pm
View user's profile Send private message View poster's gallery Reply with quote
RED-DOT



Member Since: 29 Jun 2009
Location: stirling
Posts: 2363

Scotland 
I guarantee that if you run a tyre on a wheel greatly less in circumference to any of the rest you will not do any damage at all as the differentials will allow for the differences in half shaft speed, that is what they are designed to do... if you have ARB or other lock up diffs you will only damage diffs when turning on grippy surfaces but you will feel the car crabbing and struggling to turn... standard LR diffs will cope no problem. 2008 RS4 gone, 123d M Sport, and a Puma 90 XS..
Post #27554 20th Mar 2010 5:25pm
View user's profile Send private message View poster's gallery Reply with quote
Cibit



Member Since: 26 Oct 2009
Location: Northumberland
Posts: 424

United Kingdom 2010 Defender 110 Puma 2.4 USW Santorini Black
Swap one over and let us know how you get on.
You know you always wanted to be a guinea pig Thumbs Up 59 2.4 110 XS Utility
55 TD5 110 CSW Special Vehicle
Post #27555 20th Mar 2010 5:58pm
View user's profile Send private message View poster's gallery Send e-mail Reply with quote
ken



Member Since: 18 Aug 2009
Location: Banging Birds with my bitches !!
Posts: 4328

United Kingdom 
You see thats the Problem I gave the official advice Red Dot gave his version

Both are right

Although firstly RD said" I always thought" then changed to "I guarantee"

Thanks RD your a brave person to underwrite the LR Diff Laughing Wink Thumbs Up
Post #27556 20th Mar 2010 6:33pm
View user's profile Send private message View poster's gallery Reply with quote
Post Reply  Back to top
Page 1 of 3 123>
All times are GMT

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



Site Copyright © 2006-2024 Futuranet Ltd & Martin Lewis
DEFENDER2.NET RSS Feed - All Forums