12th April 2009, 10:16 PM
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If it was me I'd look at 235's or 255's in 70's. If you want to go up in size then this is a good reference: Clifton: Disco2 Tyresizes
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 08 Defender 110 TDCi 99 Defender 110 300Tdi 08 Kimberley Kamper Platinum iMac MacBookPro flickr Past: 03 D2a Td5, 97 D1 Tdi 
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AussieAub (13th April 2009) | ||
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13th April 2009, 12:03 AM
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with a 1.9% difference in circumference, i wouldnt be overly concerned with windup, but i would be replacing the blown tyre asap
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AussieAub (13th April 2009) | ||
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22nd April 2009, 08:29 PM
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New rubber now fitted
Just thought I'd post an update and some pics.
Decided to go for a set of 235/85R16 Hankook RT-03's. Look fairly darn rugged, and big thumbs up and thanks to Beefy for supplying a spare in the same size, and giving me a hand refitting the spare wheel carrier to suit. Cheers again fella. Thanks also to all who replied to this thread supplying really useful info, as always! So here's some pics taken over the weekend just gone down in Bridgetown, WA.... Cheers, ..:: KIEREN ::.. 2000 Disco II Auto V8 Object Of Mass Consumption
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22nd April 2009, 10:13 PM
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I cannot remember a reference, but I have seen results of an actual test of the change of effective rolling radius with tyre pressure. The result is that for radial tyres, there is no appreciable change in rolling radius for any realistic change in pressure.
The reason for this is obvious if you think about it. The distance travelled for one revolution of a wheel is equal to the length of tread laid down on the road during that revolution. For a radial tyre (even for a crossply pretty much) the belt prevents any stretching of the tread with changes in pressure, until the pressure gets so low that the belt buckles, carrying the load on the sidewalls and sliding the tread. This means that the same length of tread is laid down in one turn of the wheel, regardless of the pressure, even if the length of the contact footprint increases at low pressures. For it to be any different implies that either the tread and hence the belt has changed in length with pressure, or the tread is sliding on the ground. So I conclude that changing the pressure to equalise the rolling radius for different size tyres simply will not work. Anyone who wants to check this can do so - simply find a hard, level surface, put a chalk mark on a tyre, and on the road, move exactly one (or more) revolutions of the wheel, mark the road and measure the distance between the marks. Repeat for a different pressure. The distance will be the same within the accuracy of your work for any practical pressures. John
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JDNSW 1986 110 County 3.9 diesel 1970 2a 109 2.25 petrol
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22nd April 2009, 11:34 PM
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245 70 R 16 is a common size tyre and i have run this size on my rovers since 1994. On Performance Wheels 16 X 8.
The last model shape Holden Jackaroo had them and the previous model Nissan pathfinder also had this size from factory plus a few other jap models. I currently run Pirrelli Scorpion AT, but have also tried Bridgestone AT, Goodyear wrangler , Toyo and Bf Goodrich Trail TA's. I have found them to be a good compromise for general driving trail,sand and road without affecting performance and fuel. My 95 Disco TDI 5 speed with 245 70 R16  My 85 RRC V8 5 speed with 245 70 R 16  The Blue disco D1 in Sinature is my 94 V8 auto same wheels and tyre size.  
Last edited by 4wd4fun; 22nd April 2009 at 11:38 PM. Reason: Photo Edit
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AussieAub (23rd April 2009) | ||
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23rd April 2009, 12:29 PM
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Quote:
I can't seem to find anything definite for WA on here: Vehicle modifications Jon
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23rd April 2009, 02:07 PM
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Hey Kieren,
Do you have any trouble with tyres fouling on the body? Also, if its not too rude, can you tell me what the Hankooks were worth? They look excellent, might be what I'm after..
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23rd April 2009, 02:36 PM
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Quote:
I would think the lift is OK, but the 71mm increase in tyre rolling diameter is definitely not legal. 71mm that’s 9.6%, so the speedo is 9.6% out and (the main reason why it’s not legal) the brakes are now 9.6% less effective than designed. The "New" rules that have been mentioned lately here are as follows; Quote from the National Code of Practice for Light Vehicle Construction and Modification (NCOP) OVERALL DIAMETER The overall diameter of any tyre fitted to an off-road passenger vehicle or a commercial vehicle must not be more than 50mm larger or 26mm smaller than that of any tyre designated by the vehicle manufacturer for that model. So these tyres are not legal under the NCOP. But wait there more… "Please be aware that the NCOP only represents the technical requirements that must be met - administrative requirements are dealt with separately by each state and territory's administrative guidelines or business rules." What this means is that ALL vehicles in the country must meet this as a minimum, and the State authority cannot introduce a rule that is outside these rules. It also means that the state can have their own laws that are tighter than these. I know that QLD, NSW and VIC are all currently specifying max of 15mm. The NCOP also talks about speedo accuracy, and that when larger tyres are fitted the speedo MUST still comply with ADR18 (instrumentation). This ADR is full of mathematical equations but the simplest point (which is now failed) is: 5.3. The speed indicated shall not be less than the true speed of the vehicleThis is why most new cars display a higher speed than what you're actually travelling. No mater what WAs state law is this doesn’t meet the new national laws…. So in the event of a good prang - I think you'll be on your own
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27th April 2009, 03:31 PM
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Quote:
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