 | Home > Wheels & Tyres > Biggest Tyre’s on boost alloys |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17352   
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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 2:45pm. Edited 1 time in total |
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15th Apr 2018 9:26pm |
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| Screbble Member Since: 26 Apr 2015 Location: Lancashire Posts: 2081 
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Good concise answer Blackwolf.
Saves me re-searching! Thank you 
Surely the Fun Police will be tucked up tightly in bed in case they have an accident during the hours of darkness? |
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15th Apr 2018 9:50pm |
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| that man Member Since: 17 Dec 2016 Location: Cheshire Posts: 83  
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Hi Standard look
 to me,, But I'mold  |
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15th Apr 2018 9:50pm |
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| Keswick90dan Member Since: 25 Nov 2017 Location: West sussex Posts: 11
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Thanks black wolf 👍 do you reckon 265/75/16 would be the better option would i need spacers with them or not?
Thanks dan |
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15th Apr 2018 9:58pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17352
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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. |
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16th Apr 2018 8:30am |
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| dnorrishill Member Since: 15 Jul 2011 Location: Hampshire Posts: 613 
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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. |
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16th Apr 2018 12:14pm |
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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4785 
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This made me spit out my tea 
Very true! I ran 265s with spacers and dirt defenders. Found that spatter up the sides was not too bad 2002 90 Td5 Station Wagon
1990 Vogue SE Triumph Tiger Explorer 1200 Td5 90 Thread http://www.defender2.net/forum/topic50767.html Tdi 110 Thread https://www.defender2.net/forum/topic69562.html RRC Thread http://www.defender2.net/forum/topic54492.html Instagram http://www.instagram.com/george_grafton |
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16th Apr 2018 12:22pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20299
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What's wrong with 255/85. ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️
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16th Apr 2018 12:48pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17352
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^^ 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". |
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16th Apr 2018 1:34pm |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260 
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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 4.0. Front 78' Dana 60, Rear CUCV 14 bolt |
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16th Apr 2018 3:45pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20299
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Is there any speedo issues with 285/75's? I'm quite happy with my 255/85's.
 ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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16th Apr 2018 4:52pm |
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| camelman Member Since: 27 Feb 2013 Location: Peak District Posts: 3368
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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.  |
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16th Apr 2018 4:54pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20299
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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. ⭐️⭐️God Bless the USA 🇬🇧🇺🇸 ⭐️⭐️ |
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16th Apr 2018 5:22pm |
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| diduan Member Since: 13 Oct 2016 Location: Central Balkan Posts: 260
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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 4.0. Front 78' Dana 60, Rear CUCV 14 bolt |
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16th Apr 2018 5:41pm |
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