lehpron
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Car Tire Help: P175/70R13?

Sun Aug 01, 2004 3:55 am

What does this mean in terms of tire size and wheel rim size?

Our car is an Hyundai Accent with those tire sizes. What bugs me is that the manual claims our tires can't have snow chains as there is little room for them.

Could I put bigger tires on this car? Or should I put smaller tires? Or should I get another car?

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sebolino
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 4:23 am

- 175 is in metric units : width of 175 mm (17.5/2.54 to convert in inches)
- 70 is the ratio between those 175 mm and the height of the tyre (difference between the outer circle and the inner circle). That means the height is 0.7 x 175 mm
- 13 is the size of the rims in inches.


You may change the rims but you must comply with the laws of your country. In France we can change the size but we must respect the external circle size (more or less 5 % I think), and keep the load index.

You can try www.michelin.com, the site gives the possible tyres for nearly all vehicle on earth.

Hope this help,

Seb
 
CPH-R
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 4:23 am

Argh, for some reason I can't remember what the P175 stands for, but I'm pretty sure that 70R13 stands for 70 cm diameter, Radial tyres & 13 cm deep - why not ask a mechanic instead? He should be able to tell you if you can put bigger or smaller tyres on.
 
ybacpa
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 4:27 am

It isn't possible to directly answer your questions regarding different size tires or why chains can't be used, since this depends on a lot more than just the size tire on your car now. That said, you probably can put different size tires on your car, but get a tire expert to give you a definitive answer.

As for the tires you have now, "P" means you have a passenger car tire (as opposed to a truck tire). "175" is the tread width, in millimeters. "70" is the ratio of the height of the tire to the width of the tire (loosely indicating the sidewall height). "R" means the tire is a radial tire. "13" is the rim size, in inches.

You're missing the speed designator, which will either be an additional letter (a S, T, U, H, V, or Z), or one of the previous letters and a number indicating how much load the tire can handle. Chances are if they are stock tires, they are probably "S".

I hope this helps.

-yb
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L-188
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 8:14 am

Does your state allow studded tires Lephon

I plan on doing that with my truck, getting some rims off a wreck at the junkyard and then mounting studded tires.

Also you might look at the big money and getting some of those tires with the special tires that allegedly don't need chains.
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desertjets
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 8:37 am

Aren't you going to school in Arizona??? Unless you live in the backwoods in the mountains you won't need chains. Plus chains are generally only good for emergency traction during and immediately after a snow fall. If you need regular winter traction then you will need winter tires... studded or unstudded, lots of choices out there. But in Prescott I doubt that you would seriously need it. Just wait for the snow to melt a day later.
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L-188
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 8:53 am

I am going to disagree with you a bit about how you use chains Desertyjets.

OBAMA-WORST PRESIDENT EVER....Even SKOORB would be better.
 
cptkrell
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 10:11 pm

Disregard CPH-Rs answer; it will get you into trouble (sorry).

Unless you REALLY have a need for chains, the newer aggressive tread designs, designated M+S (for mud and snow) might serve you well without the hassle. Chains will seperate from the tread surface via centrifugal force, effectively increasing the overall diameter of the wheel/tire package; your car's wheelhose 'flop' parameters are probably tight enough to come into contact w/ the chains at speed causing damage. Remember too, actual rotating width is increased with chains and the interference may be worse inboard or outboard of the tire rather than at the diameter of it. One or both of these design situations are probably the reason for the warning in your owner's manual (we had a similar situation on last-generation Camaro/Firebirds, for example).

If you replace wheels with an aftermarket variety, make sure the offset (your car probably has "0" offset, meaning the lug nut mounting surface is at the center of the rim width) isn't far from specs. Radically altered offset not only screws up suspension geometry puts puts incredible overloads on components.

'Customising' tire combinations is possible, too. On my little S10 I have P235/70R15 on the front and P255/60R15 on the rear. This gives front and rear tires approximately the same load radius (overall diameter), a consideration with antilock brakes, but an extra 20mm tread width on each rear, helpful on the farm with 2WD. I'm assuming your car is FWD and you will probably not want to concern yourself with such. In any event, make sure you don't violate the hard metal envelope.

A GOOD tire store will help you calculate your needs, and will have the experience from other customer requests as well. Regards...Jack
all best; jack
 
Skyway1
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 11:07 pm

On my car I moved up from P205/55R16 tires and wheels to P225/40R18's. The overall diameter of the new package is only 2 tenths of an inch wider than stock. And speedometer readings are only off about half a mile and hour at 60MPH.

Cptkrell....

I am looking at new models....what do you thnk about the new Cobalt??? I think GM finally has put together a nice small car....oh and I have an Ecotec motor in my auto right now so I know it's a winner of an engine!

Chris
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cptkrell
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RE: Car Tire Help: P175/70R13?

Sun Aug 01, 2004 11:24 pm

Skyway1; I was not involved at all with the Cobalt program, nor do I have any opinions or feedback from others @ GM, so I'm not qualified to make a judgement. I'll only say that it 'appears' to be a good offering for its' market segment; hopefully performance and quality will be worthy of purchase consideration. Sorry I am of no help. Regards...Jack
all best; jack
 
Skyway1
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RE: Car Tire Help: P175/70R13?

Mon Aug 02, 2004 12:33 am

Cptkrell.....

Thanks for the quick response! Every time I visit the dealer they have no info on the car......hopefully sometime soon they will have some info. I really like the Mazda3s 5-door....and you can get it fully loaded for a great price....although I have GM loyalty(I mean purchasing many cars...not I only like GM) and hope they can give me a good deal. Also, I know how the ECO motor runs and the performance gains that can be achieved.

Chris
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lehpron
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RE: Car Tire Help: P175/70R13?

Mon Aug 02, 2004 4:17 pm

I do not know what studded tires are and I forgot that larger tires will make you seem slower and go farther than you really are. Our car is stock and it is used (1995).

At this point my job should rake in about 6k by the end of the year, subtract school related fees and I should have 2500 for the car. obviously I can't get a used one unless I don't mind getting more miles than my mom's car and all the happy stuff that goes with it  Insane. she's thinking of giving it to me and get herself a loan for a newer one.

That means I may have to have this fixed. The tires are as old as the car, the rims look like there is this silver-colored fabric on them that is torn and its so dirty i cant clean it, i may need the engine tuned, i know I may soon have to replace timing belt at the 120k mile mark and worst of all, the lavender paint is fading. Personally; the tires, rims, and engine tuning are important now. 27 MPG but it has a problem with hills, like small community hills, it wont accelerate. i kinda think better tires mean better traction and therefore give me the impression of better movement up the hill, i donno. Maybe change shocks and/or brake pads or whatever later -- as you can see i would make changes but i am sure it goes past the budget.

i know i am an aggresive driver, i brake late and gas up like i'm in a race at green, but i'm not in a high performance car, (it's a 4-door POS) so it looks ridiculous to get passed up at 40 miles per hour!

i want better stuff for this car but i don't know a ga'damn thing 'bout cars.
The meaning of life is curiosity; we were put on this planet to explore opportunities.
 
Qb001
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RE: Car Tire Help: P175/70R13?

Mon Aug 02, 2004 11:00 pm

Sebolino had the good answer here.

You can play with the tire's width, but you must adjust its height ratio accordingly. Larger tires should come with lower height ratio, and vice-versa.

My car came with tires that are 205/60R15. But in the winter, narrower tires offer better performances in the snow. So my winter tires are narrower (195) and the height ratio is higher (65). So my winter tires are 195/65R15.
Never let the facts get in the way of a good theory.

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