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alanhid

Member Since: 24 Jan 2010
Location: South Lanarkshire Scotland
Posts: 221

2006 Defender 90 Td5 XS CSW Bonatti Grey

tyre sizes for Boost alloys

Probably been asked a hundred times (Idid try a search) but whats the biggest tyre you can run on a boost alloy without affecting the gearing etc and not requiring spacers.... though would consider adding spacers if neccessary?
currently running the standard Grabbers 235/85/16 and looking at getting either a set of BFGs or the new Cooper Discoverer st max Life is not a rehearsal!
Def 90td5 CSW xs 2006

15th Jan 2012 4:00pm

T1G UP

Member Since: 08 Dec 2009
Location: Bath
Posts: 3101

2011 Defender 110 Puma 2.4 XS CSW Orkney Grey

285s

just sold a set!

15th Jan 2012 4:04pm

The Boy

Member Since: 28 Aug 2008
Location: East Northants
Posts: 1459

2009 Defender 110 Puma 2.4 XS CSW Rimini Red

Any tyre taller than 235's will effect gearing but depends on the size. Boosts are 7 inch wide and this will restrict the tyre size.

This link will give you a guid. (click the veiw spec link on the right bottom)

http://www.bfgoodrichtires.com/tire-select...spec_table

I too have 285's running on 8.5 inch rims, if anything else it makes the speedo run true

15th Jan 2012 4:26pm

robpenrose

Member Since: 15 Jan 2011
Location: Hampshire or Cornwall
Posts: 338

i have 265s.

Went on my standard 90 without any rubbing or modification Current:D4 HSE
Gone: BMW Z4MC
Gone: Defender TD5 90 CSW
Previous: Discovery TD5 ES (Gone)

15th Jan 2012 4:31pm

LandRoverAnorak

Member Since: 17 Jul 2011
Location: Surrey
Posts: 11324

The common sizes are either 235/85, which is how they come from the factory, and 265/75. The latter are, as near as makes no difference, the same diameter as the former so they're interchangeable. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia

15th Jan 2012 5:22pm

Reiver

Member Since: 04 Dec 2011
Location: Cumbria
Posts: 48

Only other thing I would add Alan is the question of whether your turning circle would be compromised with wider track tyres? It'd 'ollocks at the best of times

I'm sure the others here would know, but I've just fitted 30mm spacers to get something appearing sensible. This is border country and the Romans built a wall for a reason!

15th Jan 2012 5:29pm

alanhid

Member Since: 24 Jan 2010
Location: South Lanarkshire Scotland
Posts: 221

thanks guys.....

just find the whole tyre thing sooooo confusing. Dont want monsters, just something slightly wider, and will put spacers on if needed. Life is not a rehearsal!
Def 90td5 CSW xs 2006

15th Jan 2012 7:32pm

MK

Member Since: 28 Aug 2008
Location: Santiago
Posts: 2448

2007 Defender 110 Puma 2.4 SW Chawton White

Actually boost wheels are 7.5" Puma 110" SW

.............................................................
Earth first. Other planets later

15th Jan 2012 10:55pm

Projectblue

Member Since: 22 Nov 2011
Location: Devon
Posts: 1096

This old chestnut. I have run 285/75 on boosts no probs although it will affect the gearing and it doesn't catch the arches, although they can catch the radius arms on full lock.

Depends on what you are trying to achieve really.

15th Jan 2012 11:05pm

ngarigo

Member Since: 24 Nov 2011
Location: Alice Springs N.T.
Posts: 81

2011 Defender 90 Puma 2.4 SW Santorini Black

265 cooper s/t maxx's on standard.... sweet...!

27 by Defender 90, on Flickr Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming...

'Wow...! What a ride!

MY11 90

16th Jan 2012 3:35am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8162

2011 Defender 110 Puma 2.4 USW Stornoway Grey

so width wise you can run a 285 on a boost alloy ok? just looking for some 33" ish tyres for the 90 puma i just picked up, the 235.85s are just too small looking with the 30mm lift it has. Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

3rd Dec 2015 8:28pm

Martin
Site Admin

Member Since: 02 Apr 2007
Location: Hook Norton
Posts: 6638

2015 Defender 90 Puma 2.2 XS CSW Montalcino Red

Tyres are not sized solely by width, you need to consider the height (percentage of width) as well.

This way, 235/85R16 tyres are the same overall height as 265/75R16. The overall height which is what you should aim to keep the same or very similar

1988 90 Td5 NAS soft top

2015 D90 XS SW

3rd Dec 2015 8:38pm

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 8162

Hi Martin, thank you for reply, yep well aware, i am trying to acheive a 33" ish height, the brand and tread i want only do that in a 285, just wondering if that will fit the boost rim, 7.5J is it? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

3rd Dec 2015 8:42pm

johnszs

Member Since: 16 Aug 2010
Location: Hereford
Posts: 459

2004 Defender 90 Td5 XS CSW Alveston Red

255 85 16 any good for.ypu james? 2004 TD5 Defender 90 xs station wagon

3rd Dec 2015 9:50pm

Lambley

Member Since: 20 Apr 2013
Location: Mid Devon
Posts: 1435

MK wrote:
Actually boost wheels are 7.5"

Since when?

3rd Dec 2015 11:16pm

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