 | Home > Wheels & Tyres > 235/85/16 vs 235/70/16 BFG AT KO's thoughts please? |
 
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| JAY BOY Member Since: 04 May 2010 Location: Not here Posts: 1706  
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Hi
The rolling ratio would be out by nearly 9 percent. Your speedo will be out. Overall diameter: 806mm 235.85.16 Overall diameter: 735mm 235.70.16 Difference in diameter: -8.81%Actual diameter change: -71mm We recommend a MAXIMUM of +/- 2.5% difference Hope this help  |
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27th Nov 2014 4:50pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971  
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Lower profile so will be marginally less vague round corners but have a harsher ride. Whether you'd notice or not I have no idea.
235/85=31.7" diameter and 100" circumference 235/70=29.0" diameter and 91" circumference Back of the envelope, doesn't take in to account the real world etc etc but that's a noticeable drop in diameter. You go 10% further on the 85s than you do on the 70s per revolution. That's a fair change to the gear ratio. You're also going to reduce ground clearance by over an inch and reduce your traction, but you say that probably won't matter. The other thing is a reduction in unsprung mass which is a good thing, again I have no idea if you'd notice. |
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27th Nov 2014 4:55pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17388 
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Personally I think that 235/70R16 tyres would look absurdly small on a Defender.
235/70 is only marginally taller (1") than the old 600x16 tyres fitted to Series SWBs and early 90s, albeit half as wide again as a 6.00 (at 9.25"). I am not sure what benefit you expect, or are looking for, but a 235/85 would in my opinion look and perform better all round. Last edited by blackwolf on 27th Nov 2014 6:40pm. Edited 1 time in total |
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27th Nov 2014 5:34pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20382
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Last sentence above is my view also, I think you'll find it'll not look right at all.
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27th Nov 2014 5:44pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971
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A friend has 245/70s or 245/75s on his and they do look a bit odd and they're bigger.
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27th Nov 2014 11:36pm |
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| Lou Sparts Member Since: 15 Apr 2012 Location: Kent Posts: 1501 
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Fitting 235/70/16s to your Td5 will reduce the already low gearing even further by about 10 per cent, not something I would choose to do ! 2005 Td5 90 XS
Steve |
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27th Nov 2014 11:48pm |
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| Hufflepuff Member Since: 25 Oct 2014 Location: Hampshire Posts: 727  
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If you are thinking of getting new BG Goodrich KOs, then in case you haven't noticed they have just released an updated version, the KO2. It was out in America at the beginning of the month but I've yet to find a local supplier to the UK. I'm first in the queue though!
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28th Nov 2014 12:22am |
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| silky16v Member Since: 11 Aug 2014 Location: Cumbria Posts: 99 
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superb thanks to all i'll just stick with the 235/85/16 profile then and use the tyres i have fitted already on the new alloys
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28th Nov 2014 11:01am |
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