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Author Topic: How wide a tire can I go with 15x8 rims?  (Read 3340 times)
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Jae
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« on: February 21, 2005, 04:38:30 PM »

On my wish list is a set of light 15" rims with as fat a tire as I can fit on.  I do not want to lose my final ratio as its already too low.  I recognize that having larger tires in the rear will affect my handling a bit but nothing some tuning cant fix.  So in prep for the new hp I expect from various mods in the future, (and the fact that I love the look of tires completely filling the wheelwell) how fat a tire can I put under the rear (and front if different) and at what offset?  Thanks for the advice.
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rx7gslse
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« Reply #1 on: February 21, 2005, 05:22:13 PM »

a pretty common AutoX setup is 225/45or50-15 all around, as long as you've got the right offset, no issues.  You can go even wider in the rear if you like, but unless you're really pushing out HP all you do is push...

The trick being, finding a 8" wide 15" wheel...  15x7 is the widest commonly availble wheel.  Tirerack can customer drill a 4x100 pattern into some 15x8 K-1s for BMWs, otherwise its usually a custom built wheel.

FWIW, 225 fits on a 7" as well..  Not as ideal, but a lot cheaper.

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keeton
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« Reply #2 on: February 23, 2005, 06:10:57 AM »

You can cram a lot in there but you said "light" 15" rims.  The wider the wheel, the more it will weigh.  Forged is typically lighter than cast but is more expensive.  The lightweight cast 15" rims (Rota, Konig etc.) are 6.5" wide.  You can get larger, but again, they weigh more.

As for tires, the wider you get the more the Miata will "tramline" (i.e. follow grooves or ruts in the road).  As with the wheels, the larger tires will weigh more.

You can look on the Toyo web site (www.toyo.com) for good comparisons of tire sizes and the tradeoffs in widths, weight and speedp error.  The T1-S tires are a little lighter than the competition.
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TedsTI
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« Reply #3 on: February 28, 2005, 01:59:04 PM »

Dont want to "overtire" the car either...
215 is as wide as I would go.
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Jae
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« Reply #4 on: March 14, 2005, 12:04:35 AM »

Did you guys see FM's setup with 245 45 16's on the rear.  Whoppers I tell you.  It takes care of that low first and second gear issue.  Course i probably wont have 350 hp's to throw at them like FM will eventually.  I suspect the 16 inch rims are 7.5 inches wide to accomodate the 245's.  Now I am thinking 225-45-16's on the rear and 215-45-16's on the front.
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rx7gslse
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« Reply #5 on: March 14, 2005, 12:22:43 AM »

stick?  My personal plans are for 215/40-16" V710s on my 16x7.5" Koseis...

For the street?  that's a tougher choice..  the 225/245 split FM is running is cool, but I've not yet found decent street tires on both those sizes..

The 215/225 split woudl probably be there better choice.


Anyone make a 245/45-15? Wink
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1984 GSL-SE - Baby popped her Wanklel Sad
1989 Suburban 4x4 - 4" Pro-Comp Lift 33" BFGs etc... DRUNK TANK!
2002 Protege5 - Lucky the drunk wagon SOLD
'04 MazdaSpeed Mx-5 Wheeee! Turbos are fun Cheesy[/b]

How can I be so thirsty this morning, When I drank so much last night??
Jae
Fifth Gear
*****
Posts: 936


« Reply #6 on: March 16, 2005, 06:12:52 AM »

Bridgestone Potenza S-03 Pole Position with UNI-T AQII   The tread looks just like the ones shown on the FM site.

http://www.bridgestonetire.com/tireselector/dpp/sizespecs.asp?passproductid=227
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