I wanted to know if anyone knew if for different size rims, you would have a differnt offset. like for a 16 inch rim you use a +45 offset and for a 17 inch rim a + 35 offset. the reason im asking is im looking at some rims that are: front 17X8 w/ +27 offset and rear 17X9 w/ +35 offset. does any body know if these will fit a 93 rx7? and i mean fit a 100% stock rx7. the rims are 5zigen typhoons hypersilver with 3.5 " deep polished lip. any help would be great. thanks.

 

okay - i wanted to post a ms excel file on this.... I still might. offset has nothing to do with diameter, and everything to do with relative widths. Offset is simply a measure from the centerline if the wheel width to the hub mounting. A zero offset is where the hub (mounting point) is exactly in the center of the wheel. A '-18' offset has a hub 18mm inboard of the centerline of the wheel width. A '+45' offset is 45mm outboard of the centerline of the wheel width.



For example:

Rim 1: 16x8 +50 (Stock RX7 rim)

Rim 2: 18x8 +50 (aftermarket)

Rim 3: 17x8 +50 (Aftermarket)

All have the same width and will mount in the same postion on the car.



A +27 hub would be exactly 23mm further inboard than the stock +50, effectivly pushing the rim lip 23mm outboard.

 

Oh, and to answer your second question on fittment, I believe they will. To check, measure with a ruler from the top of your tire to the fender inner lip. In the front, you'll need more than 23mm (.906 in). In the rear, you'll need more than 27.7 mm (1.091 in) of fender-to-tire clearance, and more than 2.3mm (.091 in) of shock-to-tire clearance. All of those numbers are in relationship to the stock wheel position.

 

will it cause any problems if i use that offset? what problems usually arise from running the wrong offset?

 

5zigen typhoon will not fit on an rx7....... pm benny to know more about it

 

the offset can affect a number of things. The most apparent problem will be clearance. Additional long-term problems can include wheel bearings, ball joints steering linkages.



Oh, and offest is not the ONLY problem with the FD. Brake clearance can be too. The brakes on the FD are a bit larger than many cars for that hold the majority of the custom import buying wheel demographics.