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Keswick90dan



Member Since: 25 Nov 2017
Location: West sussex
Posts: 7

United Kingdom 
Biggest Tyre’s on boost alloys

Hi

What’s the biggest size tyres you can fit in standard boost wheels?
I want them to look wider

Many thanks
Dan

Post #701130 15th Apr 2018 9:17pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 8367

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

In practical terms 285/75x16 is the largest tyre you can safely run on Boosts, although the Fun Police will probably pop up in a minute with dire predictions of doom.

A Boost rim is narrower than the minimum specified by most tyre manufacturers for this size, but there are many people who have run this combination without any problems for years. The Fun Police will usually at this point mention insurance and predict loss of cover.

You will find that you probably need 30mm spacers with this combination since, unless you only want to orbit small planets, you will find that the turning circle becomes tricky. Mention spacers however and the Fun Police have to lie down for a while in a Dark Place.

Provided however that you insurer is ok with it, you can run 285s on Boosts with 30mm spacers with no problems other than the dirt you'll get all over the sides.

(Edited for spelling)


Last edited by blackwolf on 17th Apr 2018 3:45pm. Edited 1 time in total

Post #701164 15th Apr 2018 10:26pm
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Screbble



Member Since: 26 Apr 2015
Location: West Lancashire
Posts: 838

United Kingdom 2004 Defender 90 Td5 XS CSW Zambezi Silver

Good concise answer Blackwolf.

Saves me re-searching! Thank you Thumbs Up

Surely the Fun Police will be tucked up tightly in bed in case they have an accident during the hours of darkness?

Post #701173 15th Apr 2018 10:50pm
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that man



Member Since: 17 Dec 2016
Location: Cheshire
Posts: 83

England 2012 Defender 90 Puma 2.2 HT Corris Grey

Hi Standard look Cool to me,, But I'mold Laughing

Post #701175 15th Apr 2018 10:50pm
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Keswick90dan



Member Since: 25 Nov 2017
Location: West sussex
Posts: 7

United Kingdom 

Thanks black wolf 👍 do you reckon 265/75/16 would be the better option would i need spacers with them or not?

Thanks dan

Post #701177 15th Apr 2018 10:58pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 8367

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

265/75x16 was a standard factory-fitted size for some vehicles and you should have no issues. This size should work OK without spacers, won't throw as much crud up the sides of the vehicle, and (being a factory-fitted size) should not cause any insurance issues. Even the Fun Police can sleep on!

Provided that this size satisfies your cosmetic requirement (and they look good, filling the arches nicely), it is a good and popular choice, with a wide range of different tyres available.

Post #701220 16th Apr 2018 9:30am
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dnorrishill



Member Since: 15 Jul 2011
Location: Whiteley, Hampshire
Posts: 572

England 2014 Defender 90 Puma 2.2 XS CSW Aintree Green

I went from 235 to 265 on the old TD5.

Found the loss of steering lock in car parks a bit limiting so added spacers... Then I discovered how much crud gets plastered over the sides when off roading!

Would I do it again, probably not, but 265 BFG AT on spacers did look good.

Post #701253 16th Apr 2018 1:14pm
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grafty99



Member Since: 15 Aug 2012
Location: North Devon
Posts: 3223

United Kingdom 2002 Defender 90 Td5 HT Caledonian Blue

blackwolf wrote:
You will find that you probably need 30mm spacers with this combination since, unless you only want to orbit small planets, you will find that the turning circle becomes tricky.


This made me spit out my tea Rolling with laughter Rolling with laughter

Very true!

I ran 265s with spacers and dirt defenders. Found that spatter up the sides was not too bad Thumbs Up 2002 90 Td5 Station Wagon
1990 Vogue SE
Triumph Tiger Explorer 1200
Defender Thread http://www.defender2.net/forum/topic50767.html
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Post #701254 16th Apr 2018 1:22pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 15913

United Kingdom 2007 Defender 90 Puma 2.4 SW Stornoway Grey

What's wrong with 255/85. Watts ÷ Volts = Amps.
Amps X Volts = Watts

Post #701257 16th Apr 2018 1:48pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 8367

United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

^^ Nothing, it's a great size although the choice of tyres is limited.

However the OP initially asked "what's the biggest size" and 285/75 is bigger than 255/85, then asked "can 265/75 be fitted", to which the answer is "yes".

Thumbs Up

Post #701265 16th Apr 2018 2:34pm
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diduan



Member Since: 13 Oct 2016
Location: Central Balkan
Posts: 71

Bulgaria 

I had 255/85 MTs on my boosts for 2 years, but a MT tyre is not suitable for my driving any more. I wanted to replace it with a 33" tyre, so I went to 285/75. I was surprised that the 285/75 is only 270mm wide! Mounted!
Cheers! Defender 110 SW MY2011 2.4tdci decat, no EGR
Jeep Wrangler YJ 1990 lots of offroad mods

Post #701279 16th Apr 2018 4:45pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 15913

United Kingdom 2007 Defender 90 Puma 2.4 SW Stornoway Grey

Is there any speedo issues with 285/75's? I'm quite happy with my 255/85's. Thumbs Up Mr. Green Watts ÷ Volts = Amps.
Amps X Volts = Watts

Post #701294 16th Apr 2018 5:52pm
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camelman



Member Since: 27 Feb 2013
Location: north
Posts: 1226

United Kingdom 

255s are actually a tad taller than 285s so will be having more of an effect on your speedo than 285s.

when I was running 285s I measured the speedo against the GPS and it was almost bang on accurate. 110 USW 2.2
s3 Lightweight 1985

Post #701295 16th Apr 2018 5:54pm
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custom90steve



Member Since: 21 Jan 2010
Location: South West England
Posts: 15913

United Kingdom 2007 Defender 90 Puma 2.4 SW Stornoway Grey

Same with mine so there must be a very very small difference there, in fact it’s more accurate than the 235’s I had were which underread about 1 - 2mph.

I’m sure Blackwolf will back me up on this one, as this was a concern I had originally but they are perfect.

Thumbs Up Watts ÷ Volts = Amps.
Amps X Volts = Watts

Post #701302 16th Apr 2018 6:22pm
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diduan



Member Since: 13 Oct 2016
Location: Central Balkan
Posts: 71

Bulgaria 

285/75 -> 100km on speedo = 102km GPS -> 2% difference for distance
The difference in speed is not noticeable. Defender 110 SW MY2011 2.4tdci decat, no EGR
Jeep Wrangler YJ 1990 lots of offroad mods

Post #701308 16th Apr 2018 6:41pm
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