Welcome back to our series on wheels and tires.
Today we are going to talk about selecting the correct replacement tires for your vehicle.
When trying to figure out which replacement tires are right for your vehicle most of us
are probably going to use the p metric system right here on the side of the tire to determine
which tire size is the correct size but there is more that goes into other than just looking
at the size of the tire to determine which tire is right. Um today we are going to talk
about a few other things like tread ware as well as speed ratings, tire construction to
determine which tire is going to be the right choice for you. For the most part a lot of
us are going to start here at the p metric system though and the size that is listed
on the side of the tire. This one here is a 27540R18. 275 indicating the width of the
tire. 40 being the aspect ratio, meaning the height of the tire. R meaning it�s a radial
and 18 meaning the wheel size. One thing we need to recognize about this size is that
there are actually inconsistencies within the industry. Meaning that you know you can
have three different tires of the same exact size listed but what you will come to notice
is some slight differences in overall height. Not enough really to effect the fitment on
the vehicle but there may be some roll out differences. As far as how long it takes that
tire to make one revolution, usually it�s not too much of a problem though and if you
stick with the same size tire, fitment is not going to be an issue. Once we determine
which size tire is the correct one for your vehicle, what you will notice is that there
is going to be a wide range of tires available. Um figuring out which of those tires out of
that long list is the correct one can be a tough deal because there is going to be a
lot of different variables that are going to affect whether that tire is actually the
right choice for your vehicle. Just because it is the right size doesn�t mean it�s
the right choice because there are things we have to consider like load rating, speed
ratings, things of that nature and also the type of design and structure of that tire.
For the most part, for passenger cars, what you will notice is there is going to be either
a summer tire or an all seasons tire available. Summer tires are just that, summer tires.
The reason for that is, you will notice that the water siping grooves in the side of the
tire are not going to be that aggressive meaning that it can�t disperse water very well.
Or it may not even be able to disperse snow, ice things of that nature so once you get
stuck in adverse conditions that tire is virtually going to be useless. Whereas, an all seasons
tire is actually going to have much more aggressive tread pattern on it to go ahead and deal with
those adverse road conditions. Past that when we look at speed ratings when we look at load
ratings, we want to be sure that tire construction is up to the task of handling that vehicle.
You know the tire, like this 275 series tire, one of the obstacles here is this tire may
fit a corvette and it may also fit a caprice or whatever it may be. Well you know those
two vehicles have two different, completely different, speed ratings or speeds they are
capable of and you want to make sure that the tire you are putting on there can be capable
of the stresses it�s going to be placed under. So in a lot of cases the cheapest tire
is not always going to be the best tire. Two other things are you going to want to consider
when selecting tires for your vehicle are the tread ware rating and whether the tire
is directional or not. Let�s talk about directional and non-directional tires first.
Directional tires can be an obstacle for a lot of our daily drivers because you cannot
rotate them in the same manner as a non-directional tire. Meaning you cannot use the standard
criss cross patterns to assure that all four tires actually make it to all four corners
of the vehicle. You can only do a front to rear swapping of the tires at that point.
Unless you do a complete dismount of the tires and rotate them that way and a lot of us are
probably not going to be willing to do. The other thing is tread ware rating. We have
to look at what our expectations are of the tire. The lower the tread ware rating means
that the tire is actually going to be a softer compound and not last as long but at the same
time it�s probably going to handle a lot better, it�s going to give you a better
ride. Whereas, the higher the tread ware rating, what you are going to notice is its going
to be a much a much harder compound which means it�s going to last a lot longer but
at the same time it may not handle as good. This tire right here has a 300 tread ware
rating which basically means for every hundred listed as tread ware is probably 30,000 miles
of ware. That is pretty common in the industry. So this tire essentially is saying it has
a 90,000 mile life. Now we know that is pretty unrealistic. Usually what you will want to
do is take the tread ware number and divide it in half so this tire here would probably
last closer to 40-45,000 miles depending on driving characteristics. Keep an eye out for
other videos on wheels and tires. Thanks for watching.