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I just bought a set of Advan RCII's (18x8.5 +31 offset) for my 2007 DXG Coupe, on Pirelli PZero Nero's (Not too sure about the size). I'm currently on stock suspension, and had the Advan's mounted today.

They're absolutely beautiful (will post pictures later), but the problem is.. there's less than 2 inches clearance from the car to the tires, and it does indeed (slightly) rub if making complete right/left turns quickly. Taking the car on the highway, there's a noticeable vibration from the steering wheel (something that never happened on my old 15" steelies). As well, it seems like the car can barely hit 100 without feeling unsafe (hard to control) on the highway.

What can I do to fix this, and is this a huge problem?

Vibration is "probably" caused by the rim not being hub-centric, ... you should add hub-centric rings to the rims to properly center itself on the hub.

But it could also be caused by poor wheel balancing, or a Tire that is out of round. (most likely hub-centric issues)

As for the rubbing ...what size Tires?

I assume from the offset 31mm that you are rubbing on the fender ?

Even with a 8.5" rim, 31mm is very "out" ... you generally need to run about a 38mm offset to fit a 8.5" rim on the Si's

There is no easy way to fix this ... other than machining the hub by 4+ mm (removing 4-5 mm of metal) ASSUMING there is enough meat on the back of the rim to safely allow this.

You are probably better off selling these off (They are really a Import RWD fitment) and buying a proper offset rim for the car.

Moose
 

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Hub-centric rings?

I'll get back on the tire size, but it's most likely the offset.

I've heard about rolling fenders.. would that work in my situation - or is machining the hub the only solution? Is the rubbing a really big issue though? How dangerous is it?


Hub-Centric Rings:
There is a lip on the hub of all Honda's (and most other cars) that an OE rim seats against PROPERLY centering the rim against the hub. (The Wheel lugs do NOT center the rim properly) Aftermarket rims normally come with an oversized hub "hole" that you insert an adaptor "hub-centric ring" that sizes the rim to match the hub of the car you are installing the rims on. This allows the aftermarket rim to be properly centered and balanced. You need to know the hub-bore of the rim (OD and the Honda Bore (ID) and then order the specifc centering rings.


Rolling fenders:
Yes that can work assuming the rub is minor and there is no chance of major tire/fender contact at full suspension compression / wheel turn.

Danger:
Depends how bad the rub is ... you could potentially cut the tire on a high speed corner, and have a catstophic blow-out ...that would be VERY bad. Also if the Rubber contacts the suspension or body under corners it can "grab" or "brake" that wheel causing you to loose control ...that also would be bad

Based on your offset (31) you will proably have problems that can only be solved by machineing

There is another issue with these low offsets ... they add to increased bearing and bushing wear.


FYI - "Cheap thrills" in Milton has a wheel lathe and "TireMAg" in Vaughn/Concorde used to be able to machine Rims ..I do not know if they do any more.


Moose
 
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