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Old 01-08-2004, 12:16 PM   #1
Chewy-WRX
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Default Switching from 225 to 215 tires

Hey guys, I'm currently using 225/45 Falken Aziens on 17"x7.5" Rotas.

I want to swtich to a narrow tire so I have less traction (so I dont kill my tranny so quick)

If I switch to 215 what is the correct tire dimension? 215/40? 215/35? 215/45?

Thanks
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Old 01-08-2004, 12:41 PM   #2
sjw
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45 is closest...
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Old 01-08-2004, 01:56 PM   #3
Benjamin Tang
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my brain is going fuzzy... someone correct me if i'm wrong.

i thought the proper plus1 sizing for the wrx is 215/45/17, and then plus2 was 225/40/18? so if i were to use a 225/45/17, would that mean the tire is too tall?
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Old 01-08-2004, 02:21 PM   #4
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on paper, 225-45-17 overall wheel diameter remains closest to stock 205-55-16. just do the math. but it just depends on the tire manuf how wide (and, thus, how tall) the tire actually is. on paper, 215-45 is ~0.4" short of stock diameter and 215-50 is 0.4"-0.5" taller than stock, but SOA recommends 215-45 when going to 17" wheels. methinks to avoid rubbing, and to use a smaller diameter rather than a larger diameter.
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Old 01-08-2004, 02:24 PM   #5
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Old 01-08-2004, 03:12 PM   #6
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Helpful site you'vs found there!
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Old 01-08-2004, 09:20 PM   #7
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That's about 5% less contact patch area between 225 and 215 tires. I doubt it will make any difference.

Craig
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Old 01-08-2004, 10:04 PM   #8
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If you really want less traction, switch to a 60,000 mile tire with rock hard rubber. Your traction is much more about how sticky your tire is than how wide it is. The increased contact patch mainly helps temperature build-up in the tire. And at 5%, I don't think it makes any difference.

The only reason I could see to switch is rubbing, it might be easier to find a cheap tire in 215/45/17, and the slightly smaller diameter reduces the torque on your drivetrain components.
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Old 01-08-2004, 11:28 PM   #9
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Quote:
Originally posted by fliz
If you really want less traction, switch to a 60,000 mile tire with rock hard rubber. Your traction is much more about how sticky your tire is than how wide it is. The increased contact patch mainly helps temperature build-up in the tire. And at 5%, I don't think it makes any difference.
Tire contact SIZE (area) is a function of tire pressure not width.

Tire contact SHAPE is a function of tire width.

Traction is a function of the mechanical interlock between the tire and the road surface. Less deformation of tire surface (i.e. harder tire) = less traction as noted above.

have fun.
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Old 01-11-2004, 01:17 PM   #10
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mch and fliz,

Much thanks.

Does anyone want to recommened a good "rock hard 60,000 mile tire"?
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Old 01-12-2004, 12:59 AM   #11
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Quote:
Originally posted by c_hunter
That's about 5% less contact patch area between 225 and 215 tires. I doubt it will make any difference.

Craig
And also the pressure on that contact patch will be about 5% more as well. Friction is a function of normal force, so in a straight line, the traction would be almost exactly the same.
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Old 01-12-2004, 04:30 AM   #12
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Quote:
Originally posted by mtb_dude
And also the pressure on that contact patch will be about 5% more as well. Friction is a function of normal force, so in a straight line, the traction would be almost exactly the same.
but tire wear would be increased.
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Old 01-12-2004, 10:23 AM   #13
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Like was suggested, find a less grippy tire - that will make more of a difference than any sizing changes. The least grippy tire will almost always be the cheapest all-season tire, so shop based on that criteria.
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Old 01-12-2004, 11:55 AM   #14
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Quote:
Originally posted by nhluhr
but tire wear would be increased.
true dat!
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Old 01-12-2004, 04:24 PM   #15
Chewy-WRX
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>>find a less grippy tire

Suggestions anyone? thanks.
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Old 01-12-2004, 05:56 PM   #16
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buy a cheap set of used stock wheels and stock RE92 tires. Put them on before drag racing. Take them off after. That way you'll have good drag times AND a car that handles well (when you're not on the way to or from the drag strip).

Or, if you really want to run a low traction all the time, just browse the tirerack website for all seasons in that size. In general you can go by the tire's UTQG rating. The higher the number, the harder the rubber, the worse the traction will be.
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Old 01-12-2004, 08:43 PM   #17
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I'm not much of a drag racer, but I've heard that RE92s with over 30k miles on them make excellent tires for drag racing.
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