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Wheel fit test... Now maybe a problem

Old 27-Mar-2006, 04:40 PM
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Wheel fit test... Now maybe a problem

It was a nice day today, so I thought I'd test fit my 06 SI wheels onto my 06 EX.

I read a post on another board by a person who put the Si wheels onto his Acura CSX, but after the wheels went on, he discovered that the front wheels made contact with the brake calipers. He used a set of 3mm wheel spacers and the problem was solved.

I put the Si wheels on my car and the wheels do not touch the brakes, but they are very close. 2 or 3mm maybe.

I'm wondering if this is enough space or should I find and use some wheels spacers just to be safe.


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Old 27-Mar-2006, 05:16 PM
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It should be OK, but just OK. I've recently done a bunch of structural simulation work on car wheels. On 18" SUV rims, there can be deflections of more than 2mm on the outer lip for the worst case side loading tests. Since your rims are smaller, the peak worst case deflection will likely be smaller since the aluminum that is in the two wheels is comparable. Add in the safety factor of your calipers not being close to the outer lip and everything should be just fine.

I would be surprised if the EX's calipers protruded further than the Si's, my guess would be that you have a stock fit, but the 2-3 mm number doesn't seem right for that. You should try comparing the fit to a stock Si and see how the wheels fit there. Maybe another TCCer can take a pic of their 06 Si for a comparison.
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Old 27-Mar-2006, 05:38 PM
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thats a lil too close for my liking...heat and expansion occur and could cause some rubbing not to mention the slightest irregularity in the wheel may cause rubbing and maybe the other wheels may fit different...I'd space em to be safe, there should be a larger gap than that
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Old 27-Mar-2006, 05:39 PM
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whats the clearance on an si??
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Old 27-Mar-2006, 07:47 PM
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There are 2 Si's at my local Honda dealer, so I'll check them out. The Si does have bigger brakes however, that I know for sure. I'm guessing that maybe they design of the calipers may be slightly different. I will probably get the spacers just to be sure.

What are the cons of using spacers? Will they effect anything?
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Old 27-Mar-2006, 08:47 PM
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3mm spacer won't effect your stud length. If you go 5mm, you need longer studs.

The further you put the wheels, the more stress you put on the studs. But you have 5 studs to ****** over the loads so 3mm won't be an issue. But if you worry, get aftermarket studs with higher grade strength.
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Old 27-Mar-2006, 08:57 PM
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thats more then enough clearance.
ctr's have huge rotors and calipers and when looking at it they barely have any clearance.

its better to have it like this then extend it and put all the stress on the studs and having them snap on you.
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Old 27-Mar-2006, 09:54 PM
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put some wheel spacers just to be safe
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Old 27-Mar-2006, 11:45 PM
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Old 28-Mar-2006, 05:41 PM
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this is my margin... about 2 mm. it's plenty for me, cuz 1. my calipers are fixed not floating, and 2. if my rims flexed I'd def be getting new ones.

now... in your case ppl are talking about rim flex and ****, but really what you need to worry about is your caliper moving. it's the caliper that flexes under hard braking. even if you do have contact, it's not going to be a huge disaster, just a lil metal on metal sound. but if you wanna stay away from that, some spacers would be advisable. however, my buddy had some brembo 300 zx turbo brakes under his tiny stock 240 sx wheels, and they rubbed once in a while. nothing terrible ever happened.
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Old 28-Mar-2006, 06:03 PM
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id say jsut leave it.
just always make sure the lugnuts are on tight

between the rear tires and on my rear end, there is liek a 1 or 2mm space and it is perfectly fine

the wheel and caliper turn with each other, and the wheel is always a fixed distance from it (unless ur lugs are loose)
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Old 28-Mar-2006, 07:17 PM
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Thanks for all the advice. It will be a few weeks until the wheels actually go on. In the meantime I'm going to find some small 1-3mm spacers just in case. There is still plenty of room on the outher side of the caliper, but the above pic is showing the area very near the centre of the wheel. I don't even think that part of the brake caliper even moves.
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