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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389   
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Can anybody who runs 285/75R16s measure across the tread contact patch for me please, i.e. the width of the footprint it would leave on the ground?
Particularly interested in BFG MT KM2 / KM3 and the Cooper Discoverer STT Pro to compare the widths. I am thinking about getting 285s for the Puma on some alloys, and I recall some of the older BFG sizes having quite a narrow footprint for the section width, but I don't have any available to measure. Thanks  ---
2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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11th Mar 2021 11:07am |
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| jimbo55 Member Since: 15 Jul 2020 Location: Midlands Posts: 385 
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Ay4alex, it should be that simple but unfortunately it’s not, all manufacturers and tread patterns are quite different
The picture below shows a 255 BFG mud compared to a 265 BFG AT, but there’s a 2 and a bit inch difference in width and not just the 10mm difference on paper  Click image to enlarge |
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11th Mar 2021 12:51pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11240 
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I think the problem here is that the number we all think of as tread width (255, 285, etc.) is actually the section width, which is a different measurement:
Click image to enlarge The actual tread width can vary between manufacturers and tread patterns. 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 |
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11th Mar 2021 1:07pm |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2224  
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As per LRA above, tread width, sectional width and overall width are different.
Below is my BFG MT 285 75 16 KM2. It's the 'side knobbles' that give the overall width of 285 Click image to enlarge Click image to enlarge > 110 XS Double Cab > Instagram @simonlanemind |
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11th Mar 2021 1:20pm |
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| ay4alex Member Since: 18 Feb 2009 Location: Midlands Posts: 327 
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You learn something every day!
110 Tdci Double Cab |
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11th Mar 2021 1:29pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7682 
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Will also depend on the rim width its fitted to. Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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11th Mar 2021 10:10pm |
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| Mdm Member Since: 11 Sep 2013 Location: Sunny Lancashire Posts: 1523
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235 85 16 km 2 versus km3.
km 2 is on a7 inch steel modular rim ad km 3 on a boost alloy also 7" wide rim Click image to enlarge Click image to enlarge |
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12th Mar 2021 7:23am |
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389
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No, hence the question. The footprint of tyres relative to their section width varies considerably. I used to run BFG 265/75R16 when they made the original MT KM, the reason I didn't move to the KM2s was that the footprint was about an inch narrower for the same section width! That will suit some terrain like the UK, but not here. Soft peat is quite commonly 5-10 metres deep (or more) so a tyre that will dig down to the hard ground is ... not that effective 
Hank, thanks for the pics, just what I needed for one type. Anybody got a similar image for a 285 KM3 or Cooper? --- 2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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12th Mar 2021 9:51am |
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389
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Is anybody able to get a tread/tape measure photo for a KM3 or Cooper similar to the ones above please? ---
2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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18th Mar 2021 9:48am |
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| camelman Member Since: 27 Feb 2013 Location: Peak District Posts: 3317
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I'm running 315/70/16 KM3s.
Just measured up and the actual main tread blocks side to side (i.e. the bit on tarmax) is only 260mm. As mentioned above, the 315 is the full width of the tyre. Click image to enlarge |
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18th Mar 2021 9:56am |
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| jaygti Member Since: 04 Nov 2012 Location: essex Posts: 375 
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Click image to enlarge 285/75 Cooper st Maxx I know it’s not exactly what you asked for but I’m bored at work, so took it anyway😉😉 245 tread width 2002 td5 90 county hardtop |
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18th Mar 2021 10:44am |
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| jaygti Member Since: 04 Nov 2012 Location: essex Posts: 375
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^^
That’s on an 8 inch rim. 2002 td5 90 county hardtop |
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18th Mar 2021 10:46am |
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| jimbo55 Member Since: 15 Jul 2020 Location: Midlands Posts: 385
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Finally went and measured the 255’s on my defender, fitted on 8.5” rims
Overall width was 275mm Tread width was 190mm |
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23rd Mar 2021 6:02pm |
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