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To 315.... or not to 315?????? SP edition

Old Sep 21, 2018, 07:17 PM
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Originally Posted by Dallas J
Are they the Rota P45 18x12 +20 or something different? Along the 315 topic, im trying to figure out wheels right now too. Im leaning towards Forgestar F14s in 18x12 around +32.
That is the same offset range i would shoot for to go 315's also
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Old Sep 22, 2018, 02:15 PM
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Originally Posted by griceiv View Post
That is the same offset range i would shoot for to go 315's also
Is offset based on the SM suspension or ASP as well?
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Old Sep 22, 2018, 02:59 PM
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Im my case that would definitely be based on SM suspension. Trailing arm in back and ability to push shock further inboard with the billet uprights are what gives me room to go in more than an ASP car.
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Old Sep 22, 2018, 08:07 PM
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^^^ what Dallas said.

You have to add about an inch to clear the stock trailing arm and about 2 inches up front.
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Old Sep 24, 2018, 11:39 AM
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Originally Posted by griceiv View Post
^^^ what Dallas said.

You have to add about an inch to clear the stock trailing arm and about 2 inches up front.

Looks like it will widen the car about 6 inches..... Thats a bunch.... At what point is the added grip not worth the added width?
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Old Sep 24, 2018, 12:03 PM
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How do you get 6in? If you can get 285/295 to fit, It would be 1" on each side to the outside to clear. So that could be as little as 2" wider. The tire is taller though, so you may find yourself rubbing sooner but just dont steer as far.

A lot of that also depends if you can get the tire beside the strut or if the spring and perch must be there like the Ohlin Flags. Clearing the spring/perch pushes things out 3/4". On my setup thats the inward front limit.
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Old Sep 24, 2018, 02:13 PM
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Originally Posted by Dallas J View Post
How do you get 6in? If you can get 285/295 to fit, It would be 1" on each side to the outside to clear. So that could be as little as 2" wider. The tire is taller though, so you may find yourself rubbing sooner but just dont steer as far.

A lot of that also depends if you can get the tire beside the strut or if the spring and perch must be there like the Ohlin Flags. Clearing the spring/perch pushes things out 3/4". On my setup thats the inward front limit.

this was was what I had figured on paper.... however I’ve never been known to be real book smart. Lol. So I’m sure I’m probably wrong.

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Old Oct 26, 2018, 09:15 PM
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Which wheels did ya'll settle on as the 11's or 12's "to have" ??
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Old Oct 31, 2018, 02:54 PM
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Originally Posted by Balrok View Post
Which wheels did ya'll settle on as the 11's or 12's "to have" ??
Going to try 12's.... will see how it goes.
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Old Oct 31, 2018, 02:56 PM
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I ordered F14 18x12 +32 last month. I'm hoping I get something before the end of the year... Fingers crossed!
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Old Oct 31, 2018, 06:05 PM
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evodave fender mod may come in handy for the fronts?

I got my rear voltex style flares from carbonplus in australia. but should be on ebay too
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Old Oct 31, 2018, 07:37 PM
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Lol, not even close. The ohlin flags move the spring down with the way the canister is hard mounted so I've lost 0.75" there. Even without that issue, the 315s are 1" wider than 285 and 295s so you're further than you can account for with the fender mod. Also, my struts are pushed in 12mm further than really anyone's because I made a custom strut mount (on the uprights) for maximum tire clearance. So I would say 315s under stock fenders would really require something beyond aggressive. May be possible, but you're really looking at sacrificing other things to get it working.

Also with the taller tire, getting low means doing more fun cutting. I think with the ASP mods, OP shouldn't be as worried about low since RC drops way too much but in SM prep with that fixed, it can be dumped pretty hard but there's still limitation above the tire even with cutting.
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Old Oct 31, 2018, 09:16 PM
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315 on a 10.5" w/stock body has been done before and gotdamnit I'll do it again! My car is already missing half its paint so I don't have anything to lose (except the other half of the paint).
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Old Nov 1, 2018, 08:50 PM
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Only problem is a 285 is faster on a 10.5" wheel than a 315 is.

Put that 315 on a 11.5 or 12" and its a very different story.
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Old Nov 1, 2018, 09:17 PM
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Dan Stainback and maybe Tim White told me the same thing. Can do 10.5 if just trying to get things sorted for fit but needs more wheel. Though we're talking hoosier here and Austin may be thinking street tire for track.
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