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Hey guys! I know there are threads about offsets but I think I may have confused myself because I'm looking at set of wheels with 11.5" wide rear as opposed to 11".
As I understand, the OE wheels on my 991.1 NB have the following specs:
Front - 20x8.5, ET51
Rear - 20x11, ET70
I'm interested in Vorsteiner V-FF 01 wheels that are:
Front: 20x9, +45mm
Rear: 20x11.5, +62mm
Based on other threads, the fronts would definitely fit, but I'm confused on the rear. I'm told that the above setup would be for a 991.2, but I though .2's have an even lower offset on the rear. I could swear that I've seen pictures and posts of folks with 991.9 NB using 55-60mm rear offset. Would 11.5" rim with 62mm not work? Also, I'm on stock suspension with 305/30/20.
Your new rear rims would have about 2 mm more inside clearance and would extend about 14 mm more to the outside. The new front rims would have about the same inside clearance and would extend about 12 mm more to the outside.
Basic math and measurements against your exist wheels can answer this for you. This graphic should help a lot. The tl;dr is "putting on a 15mm spacer will do the same thing as putting on those rear wheels"
Your rears are 11 wide on a +70 offset.
Going to 11.5 wide will add 6mm to each side of the wheel -- that's 6mm closer to your fender, and also 6mm closer to your shocks.
Going from +70 to +62 offset will push the entire wheel out 8mm more, for a total of 14mm further outboard on the outside edge (aka closer to the fender), and 2mm outboard on the inside edge (aka away from the shocks), if my math is correct.
Thank you for the replies. The graphics are helpful. 14mm (~0.55 inches) towards the fender doesn't seem too much, though with stock suspension (ie. no camber lean), it might be pushing flush/slight poke. Will it look odd?
Considering that Sport Techno's for 991.1 NB in the rear are 11.5 x 20 ET68, it doesn't sound too off.
I'm not sure about stock suspension but on lowered cars those offsets will work fine on a NB. I've done multiple WB offsets wheels on my NB and i like the aggressive look. Some don't like wheels so close to the fender but i like the flush look.
The issue with flush/poke is unless there's sufficient dynamic camber on compression, you'll hit the fender when driving over bumps or accelerating out of a corner aggressively. I'm not nearly well versed enough in the 911 suspension to tell you if this is or is not the case, unfortunately.
The issue with flush/poke is unless there's sufficient dynamic camber on compression, you'll hit the fender when driving over bumps or accelerating out of a corner aggressively. I'm not nearly well versed enough in the 911 suspension to tell you if this is or is not the case, unfortunately.
Yes 100%. i definitely had some camber adjustment when i got my alignment done. I don't remember exactly how many degrees but it wasn't much. When you lower the car, you'll also get a little bit of camber adjustment just from lowering.
The new wheels and tires were installed on Saturday. I was concerned about the fitment, but front and rear are pretty much flush. Pardon the dirty car . I initially wanted Michelin PS4S, but prices are crazy right now, and I got a good deal on the Conti's. I kind of like the more rounded shoulder profile of the Conti's over Michelin's in this case due to the more aggressive offsets.
Vorsteiner V-FF01 wheels mounted wrapped with Continental ExtremeContact Sport:
11-23-2021, 05:30 PM
Clarification on wheel offsets for 991.1 NB
. I initially wanted Michelin PS4S, but prices are crazy right now, and I got a good deal on the Conti's. I kind of like the more rounded shoulder profile of the Conti's over Michelin's in this case due to the more aggressive offsets.
