 | Home > Wheels & Tyres > Help needed with wheel & tyre choice |
 
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| datcullen Member Since: 15 Aug 2013 Location: UK & Italy Posts: 153  
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I posted this under Devon-Rovers thread but should probably have started a new one as I've found some more options so apologies for the cross-post...
I've read every tyre / wheel thread on here and had settled on: Cooper Discoverer ST Maxx in 265/75/R16 on 16 x 8 Tuff torque ET0 modulars However that size ST Maxx seem to be out of stock everywhere with no due date to come back in so... ...looking at the available sizes in this tyre what do people think? Should I stick with the same wheel and go for: - 265/70/16 or - 285/75/16 Switch to a 16 x 7 wheel and fit - 235/85/16 or - 245/75/16 Go to 17 x 8 wheel - although I'm not sure I've found a ET0 wheel with the correct PCB - and - 265/70/17 Or another tyre which has the same balance of characteristics that the ST Maxx has...? I do - 75% road driving year round - so often in rain - including long cross Europe drives heavily loaded - 25% off-road in Europe which is mostly rocky / stony / loose shale tracks which can really eat tyres plus some snowy stuff. - Only very occasional mud. TIA Beau 110 UW - '15 2.2 90 - '85 V8 soft-top RRC - '84 5 door, Option Pack C, 33k miles from new --- Elise S1 - '00 Millennium SE Elan +2 - '68 kit built by my dad Panda 4x4 - '87 in Italy |
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29th May 2018 6:56pm |
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| datcullen Member Since: 15 Aug 2013 Location: UK & Italy Posts: 153
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Thanks Mick - did you go with KO2 or KM2? 110 UW - '15 2.2
90 - '85 V8 soft-top RRC - '84 5 door, Option Pack C, 33k miles from new --- Elise S1 - '00 Millennium SE Elan +2 - '68 kit built by my dad Panda 4x4 - '87 in Italy |
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29th May 2018 7:58pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324 
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As I said on the other thread, both 245/75 and 265/70 are a lot smaller than the 265/75 that you started at and will affect your gearing and speedo reading. The only one with the same radius is the 235/85. 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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29th May 2018 8:31pm |
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| mick Member Since: 08 Feb 2010 Location: Yorkshire Posts: 2109  
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Ko2
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29th May 2018 8:35pm |
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| datcullen Member Since: 15 Aug 2013 Location: UK & Italy Posts: 153
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Thanks Land Rover Anorak - I was aware that they would be slightly smaller - I read somewhere 13mm difference between 265/75 and 265/70 but very good to know how much difference they will make.
Thanks Mick. Any other thoughts? 110 UW - '15 2.2 90 - '85 V8 soft-top RRC - '84 5 door, Option Pack C, 33k miles from new --- Elise S1 - '00 Millennium SE Elan +2 - '68 kit built by my dad Panda 4x4 - '87 in Italy |
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30th May 2018 6:54am |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971 
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Definitely go with the 235s.
The others are not Defender sizes. Or go with something like the AT3, they've just announced a new range of AT3s. |
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30th May 2018 8:11am |
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| datcullen Member Since: 15 Aug 2013 Location: UK & Italy Posts: 153
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Thanks all. The deed is done.
5 x 16 x 7 ET0 black modulars with 235/65/R16 ST Maxx I'll let you know how I get on. 110 UW - '15 2.2 90 - '85 V8 soft-top RRC - '84 5 door, Option Pack C, 33k miles from new --- Elise S1 - '00 Millennium SE Elan +2 - '68 kit built by my dad Panda 4x4 - '87 in Italy |
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30th May 2018 12:54pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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235/65 or 235/85? 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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30th May 2018 6:36pm |
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| datcullen Member Since: 15 Aug 2013 Location: UK & Italy Posts: 153
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Ah - typo - should have read 235/85 - well spotted! 110 UW - '15 2.2
90 - '85 V8 soft-top RRC - '84 5 door, Option Pack C, 33k miles from new --- Elise S1 - '00 Millennium SE Elan +2 - '68 kit built by my dad Panda 4x4 - '87 in Italy |
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30th May 2018 7:18pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2178 
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I've 285/75 ST Maxxs on my 110. Standard gearing. Speedo reads 100% bang on according to both my TomTom Satnav and Google/Waze.
Can't recommend the ST Maxxs enough either. Quiet and comfortable on road and pretty brilliant off road, only a foot of clay managed to stop them! |
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30th May 2018 7:18pm |
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| Cupboard Member Since: 21 Mar 2014 Location: Suffolk Posts: 2971
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I'm confused about my speedo.
I run 7.50R16s and doing 70mph on the speedo corresponds to 67mph on a GPS. My ultraguage can also display the speed, and 67mph on that is equal to 67mph on the GPS. The discrepancy increases with speed. The Defender obvously does know the correct speed but then it lies. As for distance, the Ultragauge has a trip meter and so does the Defender. They almost agree, but differ by about 0.3 of a mile per 100, which is a bit weird. The odometer is obviously more accurate than the speedo. |
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31st May 2018 11:12am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17450 
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This is actually not surprising.
Speedometers are by law allowed to over-read by up to 10% but are not allowed to under-read at all. Since it is inherently quite difficult to guarantee that a speedometer is spot on (and for 'difficult' read 'expensive') most instruments are designed to be plus or minus 5%, which is easy. However in order for them then to be legal, they are designed to over-read by 5% so that one which is at the -5% end of the tolerance band ends up not under-reading. Modern GPS units generally are pretty accurate but there are as far as I know no standards for them. If one was to be used as a vehicle speedometer it would have to meet the accuracy requirements of the type approval regulations etc. |
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31st May 2018 2:25pm |
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| Martyn668 Member Since: 17 Mar 2013 Location: Cambridgeshire Posts: 135
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Hi Blackwolf,
I agree that GPS is more accurate as a speedo, but you'd lose the signal in a tunnel, and therefore your speedo. I think until that is overcome they will never be legal. Also, other things that affect speedos are under/over-inflation of tyres and as your tyres wear, they get smaller. |
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16th Jun 2018 12:48pm |
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| wyvern Member Since: 13 Dec 2009 Location: Cornwall Posts: 2117 
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From memory - I think that there are some situations that a sat nav may read a different speed than a speedometer as its measured 'over the ground’ from the location of the satellite point rather than moving measurements from the rotating wheel of a vehicle - so if going up or down a steep hill the sat nav speed may read slower or faster than actual road speed due to the angle of the road in relationship to the position of the satellite signal ...
just a thought  Poppy - TDCI (Puma) 110XS 2.2 - Camper conversion - see the build here - https://www.defender2.net/forum/topic56530.html
Elgar -TDCI(Puma) 110XS Dormobile - now sold Devon & Cornwall 4x4 Response - DC126  |
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16th Jun 2018 4:08pm |
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