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WPRO18



Member Since: 13 Feb 2023
Location: London
Posts: 66

 2005 Defender 90 Td5 SW Cairns Blue
Different spare wheel (same but new tyre)
I have a set of MACH 5 wheels fitted (unsure of width/offset) with 265/75/16s, I recently fitted a matching albeit new 265/75/16 to my spare. But in the absence of a matching wheel, I'm using a boost wheel which at the very least I know is a much different offset.

So in the instance of needing to use that spare with boost alongside the other mach 5's, is there any issue for the diff / drivetrain? (my thinking is no, given the matching tyre spec albeit with more tread. Hopefully to not need it... Rolling Eyes )

The only purpose would be to get in a position for recovery or the nearest tyre shop. Also carrying the different wheel nuts required.
Post #1033964 6th May 2024 3:43pm
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Jabberwocky



Member Since: 27 Oct 2021
Location: Luxembourg
Posts: 197

Luxembourg 
Willtheyfit.com will give you all the info you need, you will need the offset of the wheels though, should be stamped on them.
Post #1033983 6th May 2024 7:02pm
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jimbo55



Member Since: 15 Jul 2020
Location: Midlands
Posts: 390

United Kingdom 
It’s not ideal, but a long as you’re prepared it’s not the end of the world, the tyre being the matching diameter is the more important factor.

I’d probably swap the wheels around so that the front axle had the same offset wheels and put the odd wheel on the back axle should the worst happen, it’d get you to a tyre shop or home.
Post #1033984 6th May 2024 7:06pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 16953

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Provided that the tyre size is the same there will be no mechanical issues whatsoever. It is possible that you will notice some effect on steering and braking if running the boost on the front axle due to the difference in scrub radius but I'd expect it to be marginal if even noticeable.
Post #1033985 6th May 2024 7:07pm
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Chicken Drumstick



Member Since: 17 Aug 2020
Location: Near MK
Posts: 555

United Kingdom 
Re: Different spare wheel (same but new tyre)
WPRO18 wrote:
I have a set of MACH 5 wheels fitted (unsure of width/offset) with 265/75/16s, I recently fitted a matching albeit new 265/75/16 to my spare. But in the absence of a matching wheel, I'm using a boost wheel which at the very least I know is a much different offset.

So in the instance of needing to use that spare with boost alongside the other mach 5's, is there any issue for the diff / drivetrain? (my thinking is no, given the matching tyre spec albeit with more tread. Hopefully to not need it... Rolling Eyes )

The only purpose would be to get in a position for recovery or the nearest tyre shop. Also carrying the different wheel nuts required.


Might be worth your effort hitting Google up for a bit and learning about diffs and offset. Short answer is offset has nothing to do with your diff!!

Overall you will be no worse off than running a space saver tyre. In fact a lot better. And most modern cars have space savers these days….
Post #1033989 6th May 2024 8:05pm
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WPRO18



Member Since: 13 Feb 2023
Location: London
Posts: 66

 2005 Defender 90 Td5 SW Cairns Blue
Thank you all so much, greatly appreciated and glad that has answered it.

Did use willtheyfit prior and came up with no change on speed etc but thought to sense check.

I did previously have a 235 which showed only a minor speed change but alas seems that it's solved now.
Post #1034085 7th May 2024 4:35pm
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