I planning on ordering a set of either BBS FI wheels or BBS Manthey wheels for my GT2

But none of them match the GT2s factory offset
997 GT2
F 8.5x19 offset 53
R 12x19 offset 51

BBS FI
19x8.75, offset 50
19x12, offset 50

Manthey BBS
19x9 , offset 45
12x9 offset 68

Manthey mentions a rear aluminium 23mm spacer for the GT2


I really want to install the BBS FI but im worried that the offset will cause a negative impact on handling at the track?

Can either of the offsets be corrected using spacers being Mantheys BBS or BBS FI ?

 

I always smirked at Manthey's contradiction when describing how supreme their rims are then grimacing when asked about the large spacer needed for most applications

The BBS FI 8.75 ET50 places the outside of the rim exactly the same as my Dymag 9 ET 53 which is 6mm further out than factory. The BBS FI has the same inner clearance but mine are also 6mm closer to the inside.
The new RS has 9 ET 47 so stick out 6mm more than mine. The RS has rear offset 48 but I am not sure if it runs small shim spacers like our GT2s (which give GT2 effective offset as 46)

I currently run the RS N1 tyres 245/35 on the fronts and my numb butt cannot feel any disparity in the handling......

The rears on the BBS FI will stick out 1mm further if you maintain the factory 5mm spacer shims - On that pic which Heiko posted (on 6bling) it looks suspiciously like he has taken the spacer off and the rims have withdrawn 4mm from the outside ?

Edit:
So in summary Manthey rear with 23mm spacer sticks out 1mm further than stock GT2. Manthey front sticks out 2mm more than stock RS and 14mm more than stock GT2.

BBS FI rear with spacer sticks out 1mm more than stock GT2 and front sticks out 6mm more (like mine)


9ET53 with 245/35 N1.... doesn't show much but I like the pic

 

Forgot to mention, from the spy pics of the GT2 RS it has front wheel arch lips denoting wider front track - It will most likely have the same wheels/tyre as on the GT3RS
Posted on 6 bling as 2012 GT2 but looks like 2010 RS to me ?

 

I agree a 23mm spacer to get the correct offset is just to much.... the bearings will wear in no time with the additional load. I think they designed there wheels to work with the wheel arches since the front will stick out so much that it will cause additional drag...

So i guess i will stick with the BBS FI , a member in 6speed who has the FIs says he is experiancing better turn in with the wider front wheels and front track...

These Dymags look amazing , its a pity they dont do anymore of these.. Are the rear ETs of the Dymags any diffrent the the FI's 50 ?

I guess the FI's are on top of your list

Regards

Moe

 

That GT2 RS Looks hot!!! , Looks like the new spoiler and maybe wing extension?
Now im having second thoughts on Mantheys wheel arches and 9 inch front rims

 

Excluding the front fascia, the fender extensions look molded on vs the tacked on look of 997.2 RS.

 

Explain bearings wear?

Manthey puts a 23mm spacer because BBS (the manufacturer of Magnesium wheels for Manthey) makes a 68ET in 12", so the same wheel can be used in multiple 911. Bearings wear from spacers come from large increases over stock offsets, the stock 997 GT2 offset is 51mm. I haven't closely look to a 997 GT2, but they might be using a 5mm spacer as the 997 GT3 RS does, in such case the stock offset is 46mm. The Manthey wheels with spacers are 45mm offset (about the same than stock).

Anyway, I would not use a 19" wheel on a 997 GT2 for track use.

 

What is considered a 'large' increase?

 

1" and up. At this point you should start considering stiffer springs, as the wheel rate is changing (wheel motion against spring motion), stiffer bushings. The extra bearing wear will come from either a large spacer, or a wheel with an offset as aggressive as that large spacer. If your stock offset is 45mm and you decide to run a wheel with offset 15mm or a 30mm spacer with the stock wheel, the bearings will wear out faster, but bearings are a maintenance item anyway.

 

Thank you for the detailed response. When utilizing an aggressive offset, I assume a lighter wheel/tire combination would reduce the rate bearing wear?

 

Nope, it has to do with the longer leverage of all the suspension components and the added flexing from this longer leverage. Lighter wheels/tires and a very aggressive offsets over stock offsets won't reduce the wear on hub bearings, and bushings.

 

R, I am sure you have replied to this a million times...

What would you do on a 7GT2?
For wheel brand, rim size and size of R tire or what I am thinking about (Yokohama 2010 Patron size) slicks in 18"?

 

NJ-GT , Thanks for clarifying regarding the bearing issues , Im considering the BBS FI's because i want to further enchance the cars overall handling and dynamics due to the unsprung weight. I only track my car a few times a year thats why im not considering 18"s

Regarding the FI's ET50 compared to ET53 , ET51 rear for the stock rims , do you think it will negativly impact the handling characteristics of the car , wheel vs suspension motion?

Regards

Moe

 

Thanks again. Your fund of knowledge is unmatched and the gold standard on rennlist.

 

Z06 , Pirelli offers 19" slicks , they use it for the 430 cup challenges