Vehicle & Technical > Defender

Wheels for Defender

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300TDi Disco:
I've got 265/75/16 on 8j rims and havent had any problems off roading, don't get me wrong they are about 2-5mm off the arches.

topless matt:
AAAh, but bigger tyres that have a greater flotation effect do not give as much traction as a thinner tyre that is able to utilise the weight of the vehicle on the tread block surfaces.  :doh:
If the grund is not able to support the weight of the vehicle then the wider the tyre the better but there will be less traction available, however, if the surface is able to hold the weight then the thinner type of tyre should be used to increase traction.

Saffy:

--- Quote from: topless matt on October 20, 2009, 07:02:07 ---AAAh, but bigger tyres that have a greater flotation effect do not give as much traction as a thinner tyre that is able to utilise the weight of the vehicle on the tread block surfaces.  :doh:
If the grund is not able to support the weight of the vehicle then the wider the tyre the better but there will be less traction available, however, if the surface is able to hold the weight then the thinner type of tyre should be used to increase traction.

--- End quote ---

The theory of fat vs skinny floatation vs cutting is good to go when comparing a tractor tyre to a bicycle (extreme example :smiley: ) but with 265/75x16 opposed to 235/85x16 is the difference *really* going to come into play in the real world, it's an insignificant difference surely? *shrug* I don't know the answer, but I bet there is some maths out there to prove it either way which I'd like to be spoon fed. All I know is that more height under my diff the less I get stuck in Wiltshire mud ruts, and it's that figure I'd be more concerned about (235/70 = no chance, 235/85 = drive most places)

topless matt:
I whole hartedly agree with you, its just a can of worms i like to open up seeing as i work on a farm, drive a landrover and race downhill mountainbikes.  I seem to spend all my time comparing tyres and pros and cons to sizes  :?

tack43:
 Each situation could mean a different size and/or different tread pattern so really it's just a case of compromise all round. In mud my special tracks are awesome, however, on snow (its classed as an M & S tyre) they're only alright, and over rocks they are downright scary (going to Stanage Edge again this weekend  :-k )! On snow and ice (over tarmac) narrower tyres are better. Over deep snow, sand and mud wider are again better. Certanly most people seem to use 235/85 or 265/75 which as said above generally clear ruts with smaller diameter tyred vehicles left stuck on the diff pan. Tread patterns also play a big part, I know mine are too aggressive for what I do most of the time and I now know something like a BFG MT or dakar would have been better. Decide what you want to do with your vehicle ie road, green lanes or P&P. Approach guys who do your chosen thing and ask their opinions. For me special tracks are great for P&P but as I mainly do green laning I would  rather have a "normal" MT tyre - they're on the christmas list!

Rich

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