Please don't ask "what sort of four-wheel-drive tyre should I buy?" Get four people around a camp fire and you will get four different opinions on the best 4WD tyre!
What is important is that tyres be kept at their recommended
pressures when driving on-road.
It is often necessary to lower pressures for off-road conditions (mud, sand)
but this can cause the tyre to "roll off" the rim
under cornering loads.
The danger is greatest with tube-less tyres
because there is an instant loss of all tyre pressure
which can lead to a
even for an experienced driver.
Pressures should be returned to normal as soon as possible,
and definitely before resuming highway speeds.
BFG - BF Goodrich
The BFG All-Terrain and Mud-Terrain (left) tyres
are popular in muddy old
(some people think that BFG
stands for Very Frightfully Good).
The Mud-Terrain is rather more aggressive than the All-Terrain
so it clears itself better although given sticky enough clay (left)
its tread 4wd.sofcom.com --> can still get filled up.
The All-Terrain is reported to wear well,
particularly in the larger sizes, e.g. 235/80-ish.
Simex tyres tires --> are made in Malaysia,
some of them from ex-Dunlop moulds. 4wd.sofcom.com -->
The tyres are gaining a reputation for good value for money.
This type (left) was fitted to the winning vehicle of the
1999 Malaysian Rainforest Challenge, in attendance at the
Four Wheel Drive Show -
The escalating tyre war has given rise 4wd.sofcom.com --> to diameter creep, from the basic 31" (7.50x16) to 33", 35" and these 38" Super Swampers [7/'00].
The objectives are to climb steps more easily and
to keep your diff' above the crown of the ruts
dug by 4wd.sofcom.com --> the other guy.
"Old" tyre dimensions are in inches, e.g. 7.50 x 16. The tyre carcass width and height are both 7.5", so there is no need to specifiy an aspect ratio (it is 1.0), and the overall tyre diameter is 2 x 7.5 + 16 = 31", in this case. The most common Jeep / Land Rover / Cruiser tyres were from 6.00 x 16 to 7.50 x 16, although some went up to 9.00 x 16. (A 7.50R16 tyre is just the radial-construction equivalent of a 7.50 x 16.)
Newer tyre dimensions are a mixture of metric and imperial quantities,
e.g. 245/80 x 16, indicates a tyre carcass width of 245mm,
an aspect ratio of 0.8 or 80% and a wheel rim diameter of 16"!
A change became necessary when tyre technology enabled aspect ratios
of less than 1.0.
Low aspect ratio tyres give better on-road handling,
all other things being equal,
but there is still a place for the trusty 7.50 x 16