I need some advice on wheel offset. I don't have much experience with wheel upgrades. I'm planning on getting the 18" Konig Beyonds. I would like 18 by 8.5 up front and 18 by 9.5 in the back. Tire sizes will be 245/40ZR18 in the front and 275/35ZR18 for the rear wheels. I'm basing my decision mainly on the way the project Mustang from Vortech Engineering looks with its 18" inch wheels. The numbers are identical with that Mustang's wheels and the ones I want.

I just don't know about offset and how much of a difference the Konigs are from the Ronals that are on the Vortech Mustang. The Konig Beyonds advertise either 20 or 35 mm offset for the 8.5"-wide wheels and 25 or 45 mm offset for the rear wheels (9.5" wide). I'm guessing I should go with the 35mm and 45mm. Help!



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Your guess is right, nice rim i considered them, i would go 255 fr 285 rear though, i like the Konig Sideways Rim--but i would call Konig and just double check, they should know, good luck

 

Thanks for the response Torch Red. It would be nice to be able to go even wider. I really want to make the car's stance more aggressive with larger wheels, wider tires, and Eibach pro-kit.

Has anyone upgraded their '05-'06 Mustang with aftermarket 18" wheels? If so what are your wheel and tire sizes, including wheel offset? Any pics???

THANKS!

 

The following I wrote in another thread. It should answer your questions. If not just hollar.

An inch is about 25mm. But here's a conv chart:
http://www.voltplastics.com/in_mm.html

Great info on offset and backspacing at:
http://www.rsracing.com/tech-wheel.html

In there you'll see as they say: Rear spacing or back spacing is the distance from the backside of the wheel mounting pad to the outside of the rim flange. The offset is the distance from the centerline of the wheel to the mounting surface of the wheel.

Anyway the stock bullit has 6.295" backspacing and a positive offset of 45mm. (Positive offset: When the back of the wheel mounting pad is closer to the street side of the wheel; here the mounting surface is outboard of the rim centerline.

If for example you used 10" rims with the same 45mm offset (mounting face in same relative postion to centerline as the stock bullit rim) then with the two inch greater rim width you are putting 1 inch more outward of your wheel mounting pad and 1 inch more inward of your wheel mounting pad. Now if you only had a 20mm offset for example that 25mm less (approx 1 inch) will be all outward movement of the rim position (just like you had thrown a 1 inch spacer on there). Now you're out 2" which to me is not acceptable, at least looks wise. Because of a special paint scheme on my GT, and I see how debris already kicks up with stock setup I have gone with FRPP 17x8 chrome bullits. ...just don't want the tires outward anymore than stock; but that's me. Up to an inch seems reasonable I guess; up to you.

As far as the rims clearing the calipers that has to do with the spoke design and how it is built with respect to the bolt face. 05-06 GTs require more clearance than most so you have to know that the rims are proven test fit for the 05-06 GT or order one and test it (before mounting any tire) yourself. OEM bullits come incredibly close to the calipers.

Hope this helps. ...Jim