Understanding wheel fitment

[dparm]

A local guy has OEM BMW 7-series wheels (style 94) that I'd like to use for my winter setup. I've plugged this into a few of those "will they fit" calculators but I don't really understand the output. I used the OEM wheel/tire sizes since that's what I run in the summer.


Rear
poke: 102mm -> 77.6mm
inset: 152mm -> 125.6mm

Front
poke: 83.3mm -> 77.6mm
inset: 145.3mm -> 125.6mm


Those are the outputs, and it also has a graphical representation.

I *think* the fronts will stick out pretty much the same as stock (face of the wheel in the same position according to the picture), but the rears will sit slightly more inside the wheel wells. This fitment will be fine, right? Am I reading it correctly?

 

[SubLGT]

I don't understand "poke" and "inset".

If you know the wheel width and offset for the OE wheels and the winter wheels, some simple math will tell you about relative fender clearance and suspension clearance.

 

[CapriRacer]

I'm thinking we're talking about offset - and it looks like we are talking 50 mm difference. That's 2 inches.

I think that is too much difference for the wheel bearings.

 

[Rand]

Quoted from random website in the UK.. thanks guys


Quote:


Wheel Offset Measurements

Because some of the more classic vehicles have had modifications made to them, different hubs, brake discs fitted instead of the original brake drums, the vehicle has been lowered etc, we will sometimes ask you for

two measurements, poke and inset, “Poke” is the measurement from the hub flange face out towards your wheel arch or wherever you would like the outer wheel rim to finish and “inset” is the measurement from the hub flange face in towards your suspension, sometimes known as front and back space, these measurements are really important and let us know what wheel offset you need, if you get this wrong your wheels may be incorrectly fitting but we are here to help, just phone us if you are unsure and we can guild you through this.



So you need to measure from the hub flange face surface out towards your outer wheel arch or wherever you would like the outer wheel rim to finish and then measure from the same hub flange face surface in towards your suspension, or wherever you would like the inner wheel rim to finish, once we have these measurements we will then be able to let you know what offset you can use on your car.

 

[dparm]

Originally Posted By: CapriRacer
I'm thinking we're talking about offset - and it looks like we are talking 50 mm difference. That's 2 inches.

I think that is too much difference for the wheel bearings.


The offset difference is only 7mm less in the rear, and 1mm less up front.

 

[Carbon]

Originally Posted By: dparm


I *think* the fronts will stick out pretty much the same as stock (face of the wheel in the same position according to the picture), but the rears will sit slightly more inside the wheel wells. This fitment will be fine, right? Am I reading it correctly?


Does this mean that the rear tires will be farther apart or closer together than the originals?