affect how a car steers, starts, stops, sounds, feels and looks...
Fact: A taller tyre gives more clearance under the differential and
chassis; a wider tyre (or change in tread pattern) gives more
• Whenever moving to a larger tyre size, re-gear the front and
rear ends to off-set the size.
• It's important to keep in mind that lifting the vehicle also
raises its centre of gravity, thus increasing chances for
• Under-inflated tyres cause the engine to work harder. Similar to
riding a bicycle with low tyres. Increased rolling resistance makes
it harder to pedal.
• Under-inflated tyres wear faster and affect the steering and
handling of a vehicle.
• Under-inflation, by as little as 6 p.s.i., can increase petrol usage by
• Cold temperatures affect the air pressure in tyres. There is a
loss of one pound for each ten degrees of temperature drop.
• Most 4-wheelers drop their tyre pressures for the trail. This
helps with increased traction.
• When airing down, ground clearance is decreased several inches by
reducing the working diameter of the tyre. Therefore the gear ratio
will be lowered slightly, as well as making the sidewalls of the
tyre more vulnerable to damage.
• Airing down tyres is the easiest and most cost effective method of
increasing off-road performance.
• "All-terrain" (AT) tread performs well under a variety of
off-highway conditions and to some extent has closed the
street/trail performance gap. The closed tread design is usually
quiet on the highway, yet noisier than a street tyre, and performs
well on rocks, sand, and on the highway.
• Only a small patch of tyre touching the pavement at any given
moment (called the "contact area") is responsible for keeping a
vehicle under control. That contact area is only about six square
inches in size.
• Under normal loads, inflate tyres according to the vehicle
manufacturer's recommendations, NOT the maximum pressure listed on
• For the most accurate reading, tyre pressure must be checked when
tyres are cold.