Q:they are oversize 235/45r17 and I can not finde the correct tire pressure for them.

it is on the side wall of the tire except for some factory continental tires. it varies by tire manufacturer and type of tire and load capacity. the way we usually do it if it calls for 35 we go 35. 44 max run 40, 41 run 41, 50 above we usually drop about 5 lbs depending on rims and vehicle weight. low profile tires need the extra air other wise you will destroy the tires. oh ya prime example of why to ignore what is on the door jamb the ford explorer incedent low air pressure was a huge factor

Q:Is a used 17 tire with a patch in the tread area safe to buy? Patch was done by professional tire shop, they are now reselling the tire. Will it leak any air over time?

You may have a very slight leak, but if it was done by a professional shop you shoudlnt have anything to worry about.

Q:I am planning on getting bigger tires for my wrangler. Should I also change the spare 5th tire to match the new larger tires I am getting? If I plan to keep the original tire as a spare, will it still do its job if i need to use it as a spare, considering the other tires will be larger?

I always cary a full size spare, but I also like to off road and use my 4wd. If you do not buy a full size spare, that is fine. You can use the stock spare tire, but it will have to go on the rear to drive decent and if you run it for too long, it will destroy the spider gears in your carrier (rear end). If you get a blow out up front, you will have to remove a rear tire, put the small spare on and then put the rear tire up front to replace the flat tire.

Q:how are tires recycled?

KN - hands down Wont mess with your engine electronics - engine light/etc. Reliable and trusted brand.Tested and proven Reasonable price and EASY to install.

Q:a)equalize tire wear. B)increase fuel efficiency.

A -- Equalize tire wear, which also yields (b) which is to increase fuel efficiency. The front tires typically wear more, because they have to steer the car, do most of the braking and they have a more complex alignment. In modern front-wheel driven car, they also do the acceleration and they carry most of the car's weight. The wear is accelerated when driving in the city or in bendy roads, and when the driving style is not very gentle. Modern steel belted radial tires are more durable to tread wear, and to diagonal wear, so there is such a thing as rotating them too frequently, but this also depends on the tires' treadwear and brand. Tires will a lower treadwear will have a softer tread which will wear out sooner and require a more frequent rotation. Radial tires should be rotated where the front pair is switched with the rear pair, and without switching sides between left and right. Tire rotation should therefore take place between 20,000 to 30,000 kilometers of milleage, depending on those variables. If done carefully, it might extent tire milleage to about 80,000 kilometers overall.

Q:Will 225/45-18 tires fit 18x8.5 wheels?

Morgan, Most 225/45-18 sized tires have a rim width range of 7 to 8.5 inches. So yes, though you are on the far end of a proper fit they would work just fine. You should be good to go.

Q:Need to replace back two tires for Porsche 911 Carrera. Any recommendations?

While it's true that all four tires should match - have similar characteristics - be aware that sometimes different tread designs from the same manufacturer are ok, if both fronts treads are the same and both back treads are the same. Porsche specifically develops tires for each of their 911 models in conjunction with tire manufacturers. Brands that are certified are indicated by N0, N1, N2, etc. molded on the tires (N0 was original equipment; N1 is the first tire certified for replacement use; etc). Example: you can buy Michelin Pilot Sports either with or without the N designator. The certified Porsche N tires cost more though they may look identical to the non-certified ones. That said, I've recently been running tires on my 911 Turbo that I can recommend for both street and track. I've been using them both places and I'm amazed at the all-around performance. They're not Hoosiers, but the track grip is impressive and they wear wonderfully on the street. I've had them at 110 mph on a wet track and they felt good (rain tires!). And they're not as loud as the Bridgestone Potenzas that came on the car; I put those on its dress wheels, and now I'm wondering if I'll ever use those tires and wheels again. These are Kumho Ecsta SPTs. They have heat and wear ratings like a street tire, yet perform well on the track. Some people have suggested to me that there are even better Kumho models I should try. An upscale tire store sales weeney suggested I should be ashamed of putting cheap tires on such an expensive car. (They run about a quarter to a third the cost of Pirelli PZeros, Michelin Pilot Sports, etc).

Q:Do you have more tires for car tires?

Suitable tires pattern. In addition to the need to pay attention to size specifications, the crown on the pattern is also need to attract attention - the pattern directly affects the handling of the car, in addition to noise, drainage performance, wear resistance and so on. The most common tread pattern is roughly horizontal groove pattern, straight groove pattern, straight horizontal groove pattern, block pattern and asymmetric pattern five kinds. Which is a good cross-groove pattern friction, straight groove pattern running resistance (the most widely used a pattern type), straight horizontal groove pattern for SUV outdoor driving needs, block pattern is suitable for mud or snow, rather than Symmetrical patterns have better drainage. According to the region where the weather, road conditions and driving habits to consider, if it is cars, MPV and SUV, to avoid the weight of the best way is to choose straight groove pattern, its applicability is the most extensive of.

Q:I bought 4 Brand new tires 2 month ago one of they blew up on me yesterday on Highway i drove about 1000 miles on it if not how much does it cost to fix tire

If you really did buy them 2 weeks ago they'll replace it under manufacturer defect.

Q:i got a flat tire and road-side assistance switched out the flat one with the spare. it was a real tire spare not the donut kind. so should i keep driving on that spare, and buy a new tire to put in the trunk as a spare.or should i replace the spare with a new tire and put the spare back?Thanks

different people ride different ways, some people downshift to slow down, some people just hold clutch and downshift later different riding styles, different purposes it'll become much much clearer after you try it.honestly