+55mm offset [Archive] - Honda Element Owners Club Forum

: +55mm offset


cjmclean
03-13-2005, 03:07 AM
Here is the scoop:

I bought some Acura wheels. They are 17 x 07. A little bit of assumption (yes, I remember the old saying) led me to believe they were +45mm offset like most of the other Acura/Honda wheels. Now I have them, and realize they are actually +55mm offset.

I realize this is moving the wheel inward about 10mm (or .39 inches). I was planning on running either 235/55/17 or 225/55/17 depending on which tires I find. I'm hoping they won't rub since with a 225/55 on a 07 " wheel, they shouldn't "bulge" as much as the stock 215/70/16 size.

It's no biggie if they don't fit. I got a smoking deal on them and can probably sell them on Ebay and make money, but I really wanted them to fit.

Whatcha think?

trickyvick
03-13-2005, 12:28 PM
I think they make spacers and you will be able to adjust them out a bit.....it seems easier to move them out than move them in???

cjmclean
03-14-2005, 09:46 AM
Wow... alot of views and no replies.

Nobody has any clue?

paulj
03-14-2005, 10:42 AM
Have you looked at the specs tables for the tires you are interested? Have you plugged your numbers in the tirecalc html page (tire wheel combination calculator)?

Having done a bit of this homework, I can make a few observations:
- you are dropping the tire diameter, compared to stock, by about half an inch. I'm guessing then that rubbing (of the tread edge) on the bell of strut tower will not be your primary problem, rather you should focus on the inboard edge of the tire (the tire at its widest).
- you are moving the inboard edge about .8" closer to the tower.
- compared to 235/70/16 tires (largest 16" ones that most try), you will be moving the inboard edge in 10 mm (.4")
- with 7" rims you probably are within the allowable rim width range for 55 profile tires; you might be narrower than 'measured rim width'.
- tirecalc.html does not adjust tire section width (235mm) for rim width - it probably should. I've seen values like a .2" change in section width with .5" change in rim width; I don't know how tire and specific that is. BFG gives that sort of number on their spec tables.

paulj

flybigjet
03-14-2005, 12:34 PM
Use these two sites to figure things out:

http://toy4two.home.mindspring.com/offset.html

http://www.miata.net/garage/tirecalc.html

cjmclean
03-14-2005, 12:43 PM
According to the second site, it says clearance on the inside will be reduced by 15mm or .63 inches. But I suppose that doesn't take into account the type or size of tire mounted on the wheel. Arrggh! I hate this wheel stuff.

Snarf77
03-14-2005, 12:59 PM
I put 245/55/18s on the E just recently with a +45 spacing. I think it was the closest fit possible without any rubbing issues of any tire wheel combo thus far. The wheels were 18x8. PaulJ's post really helped me out as for what i needed to look at. Check the section width of the tire you are looking at from the Mftr's website.

Compared to my fit, you are 10mm further in, but you are also gaining .5 inches of width back from that (8 inches vs 7 inches wide) if my thinking is correct. Thats about 12.5 mm. So you would actually be 2mm further out than the edge of my wheel with a smaller overall diameter tire. With a 235/55/17 you'd be about 1.4 inches smaller diameter than what i have mounted which really would help the situation when looking at the strut.

I think you wouldn't have any problem with this combo wheel/tire but maybe someone can run a sanity check on my thinking.

cjmclean
03-14-2005, 01:47 PM
Allright, here is the info from the Goodyear site. The tires I am looking at are 225/55/17 Eagle LS:

The recommended rim size is 6.0 - 8.0, so my 7.0 is right in the middle. The section width is 9.1 " and the tread width is 7.4.

How will the 9.1 " section width affect my situation?

Snarf77
03-15-2005, 09:18 AM
Maybe this picture will illustrate:
http://www2.freepichosting.com/Images/421529122/19.jpg

This is a 245/55/18 with a 45 offset on an 18x8 rim. Looking at my previous post, I think that the tire and wheel combo will come down 17.5 mm fromt the top of where my tire is and 2.5 mm further away from the strut. I have no clearance problems with a larger tire than you are talking about and I don't think you would have any problems with 235/55/17.

cjmclean
03-15-2005, 09:52 AM
Wow.... you really got it close there. I'm going to try them. If they don't fit, I'll just sell them. T'anks!