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Larger rims and the best offset


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#1 damannm

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Posted 28 February 2017 - 06:22 PM

I am nearing having all I need to complete my car. Rims are the last thing on the list but I need to know how big I can actually fit in the rear and the front. I would like to have a 255 up front so 8.5 or a 9 should fit the front well. However the rears I am unsure. I want to go something around a 285 or 295. So i will need a 10.5 or 11 inch rim. Can anyone give me any insight into what they have and what offset they are running.





#2 Shaggy_TSi

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Posted 28 February 2017 - 07:16 PM

http://www.starquest...topic=75677&st=
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#3 importwarrior

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Posted 28 February 2017 - 07:51 PM

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#4 Fuze

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Posted 01 March 2017 - 09:07 AM

It will be hard to run an 11" wide rim in the stock wheel well and not scrub, without modification, but you might be able to stuff it in there. You'll have to roll the fender lips and work on the wheelwells with a hammer. I don't know how low you are either. You won't find any 16" rims that wide most likely and tires that size in 16" are pretty scarce too so you'll probably have to go to a 17" rim and 40 or 35 series tire.
  • If you had a 9" SHP rim for example, which is -10 offset, you could run a 25mm (1 inch) spacer behind it to bring it flush with the fender. That's a total of -35mm offset on a 9" rim to fit perfectly, the best offset to shoot for if not using spacers on a 9" rim.
  • If you go wider to a 10" rim, -10 offset would be the number as you subtract 25mm (1 inch) of offset. You don't want to come out further, so that extra width will be on the inside barrel.
  • 11" rim would work out to another 25mm (1 inch) on the inside, taking you to +15 offset.

For example I have 17x13's on the back with a 7" lip and 6" barrel, 285/40 tire, needs a 25mm spacer to clear the D2 coilover, the tire is stretched and when bolted on the rim comes out past the stock fender by a few inches. These fill out the widebody kit which adds 3", but major surgery/cutting/welding was required to the wheel wells to make room for them.

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#5 aconro

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Posted 01 March 2017 - 12:51 PM

Im running a 18x10.5 on the rear and hopefully the front also.

http://www.circuitpe...k-5-114-3-et22/

With a 25mm spacer on both front and rear, they fit perfectly.  I am also only running a 245/35/18 tire.  I needed the 25mm spacer just to clear the D2 coilovers.

With the 245, there is plenty of room between the quarter panels and tire, it may be close with a 295.  I plan to run a 275 at a minumum.  My fenders are also rolled.

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#6 Fuze

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Posted 01 March 2017 - 01:24 PM

Looks nice. ^^^ Those rims are a 22mm offset, so with a 25mm spacer you have a -3mm offset wheel in 10.5 inch width. If you go from 245 to 275 you're also going to add height as well as width, just how it goes.

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#7 aconro

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Posted 01 March 2017 - 02:47 PM

^^^Thanks man!

I have also found this website to be very helpful when determining offsets.  It does most of the hard work for you and is great for a visual representation.

http://www.willtheyf...10-5&offset2=22
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#8 Fuze

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Posted 02 March 2017 - 09:33 AM

That's a good calculator, I used them before. The visual illustration is pretty cool too. 275/35-17 is a sweet spot for availability because it's the front size on a stock C5 Vette. Gets harder when you need to go to 295 or bigger on a 17... :mellow: So much more available for 18" in those sizes.

I did the same calculation with your 18" size:

Will They Fit.com

Looks good as far as fit. It shows no increase in height, but in reality the wider tires always add height, depending on manufacturer some more than others.

Edited by Fuze, 02 March 2017 - 09:38 AM.

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#9 damannm

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Posted 04 March 2017 - 04:34 PM

Thanks fuse you are very helpful. Rims and tires will be the last thing but I am very close. I just received my BW EFR 7670 today. The manifold shouldn't be far behind.




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