Opinions wanted on tyre width/profile
Submitted: Thursday, Dec 17, 2009 at 18:14
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Member - Chris & Debbie (QLD)
What are peoples thoughts on the advantages/disadvantages of the difference between 285/75- 16 and 305/70- 16 tyres?
What advantage does one profile have over the other in regard to traction and puncture resistance?
This is in regard to light truck series such as Cooper STT, Wrangler MTR, Toyo M/T etc. in off-road situations.
Thanks in advance
Chris
Reply By: Atta Boy Luther - Thursday, Dec 17, 2009 at 18:28
Thursday, Dec 17, 2009 at 18:28
There the same height but diffrent widths . Here is the qld rule . However, for an off-road passenger vehicle fitted with
front and rear beam axles, the maximum tyre width
must not be more than 1.5 times the vehicle
manufacturer’s widest optional tyre.
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Reply By: Ozrover - Friday, Dec 18, 2009 at 09:38
Friday, Dec 18, 2009 at 09:38
Gerday Chris, good to see that your still about.
I personally can't see any advantage to going to an odd size of tyre, the main problem is replacing them when/if you destroy one.
265-275 & even 285 tyres of either 70 or 75 profile are fairly common, but when you start getting to more exotic sizes then most outback tyre repairers won't carry them, this goes for 18 + diameter
wheels.
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Follow Up By: Member - Chris & Debbie (QLD) - Friday, Dec 18, 2009 at 15:02
Friday, Dec 18, 2009 at 15:02
Hi Jeff, yes still about, hope all is still going
well for you out there. We were thinking of coming over for another visit next year but will probably head up the Cape instead, still undecided though.
Good point about the availability, thanks for that.
Chris
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Reply By: MrBitchi (QLD) - Friday, Dec 18, 2009 at 10:08
Friday, Dec 18, 2009 at 10:08
In general terms a wider tyre does not really do much for grip in most situations. A taller skinnier tyre will go further and be less prone to punctures as the contact patch is long and skinny, not short and fat. It also has less rolling resistance.
Fatter tyre LOOK better but don't GO better ;-)
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Follow Up By: Member - Chris & Debbie (QLD) - Friday, Dec 18, 2009 at 15:25
Friday, Dec 18, 2009 at 15:25
Thanks for that, I was thinking that the shorter sidewall may not bulge as much, making the tyre less prone to sidewall puncture but I can see where you are coming from.
Chris
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Follow Up By: ChrisE - Wednesday, Dec 23, 2009 at 07:51
Wednesday, Dec 23, 2009 at 07:51
When you say "shorter sidewall" you may be on the wrong track. The series is a percentage of the width, ie. a 70 and 75 series on the same width would be shorter, but the 285/75- 16 and 305/70- 16 has the same sidewall distance ie. both about 33" diameter (840 and 841 mm - from Cooper site -
http://www.coopertires.com.au/tyres/stt_new_specs.htm), just different width (also check rolling distance).
My personal opinion is the wider the better for sidewall staking as there is more tread on the road and I think therefore more protection for the sidewall as it doesn't bulge outwards as much. I have just fitted 315/75R16 Cooper STT's. Waiting to try them out now....
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