can 15inch fuchs fit over 930 brakes?

panzerfaust · 01-30-2016, 06:34 AM

looking for some options to do a mild backdate with smaller dia 15 e50-bbs, fuchs or campy (group4 replicas ) wheels.

i would like to know if 15's fit over a 930 brakes on my 84. can you remove the rear spacers too for a deeper dish look? my front hub spacers are fixed unlike the earlier 930's.

regards
pf

gumba · 01-30-2016, 08:04 AM

Yes they fit, but you may need a 1/8" spacer. I run 13x15's on the rear.

kenikh · 01-30-2016, 08:31 AM

Yes, but you will have the best luck with early floating rotors given offsets. This of course depends on the wheel widths and offsets.

panzerfaust · 01-30-2016, 09:36 AM

so they will clear the barrel section but are tight near the spoke/hub area hence a 1/8 spacer to move them cross car?

i have a 84 car so no 78-79 floating calipers. i like to run 9x15 F and 11 or 11.5x15 in the back. im thinking removing the factory spacer in the back to run a deeper dish neg offset

gumba · 01-30-2016, 10:34 AM

Yes, My wheels scraped the fins, a 1/8" spacer fixed that. Some folks will file down the fins to clear.
You can shoe horn a 12x15 under the rear stock fenders.

panzerfaust · 01-30-2016, 05:42 PM

Ok thanks for the replies

RarlyL8 · RarlyL8's Garage

I ran 12x15's on my 930 slant, it's tight but they fit.

panzerfaust · 02-01-2016, 10:19 AM

Wow that's tight... Thank for posting the pics

Cashforvehicles · 02-02-2016, 04:54 AM

i have a set of Fuchs for sale 2 15x7's and 2 15x8's

panzerfaust · 05-25-2016, 02:35 AM

I'm trying to get 5.5 inner n 5.5 outer barrel for the deepest looking wheel in the back on 930 hubs/arms. These are my 7" barrels mocked up with spacers to appear like 5.5.

Are these sticking out too far? I have them mounted here on the car with 6mm spacers to clear the calipers. I'm running about -2 or 3 degree camber

Anyone done 5.5 in 5.5 outs on a 930?

gumba · 05-25-2016, 04:54 AM

I'd want at least a 6" back spacing. What tires are you going to run? Is this a 930 or 930 look. Is the 2-3 degree camber for the track and race tires?

panzerfaust · 05-25-2016, 05:46 AM

harold

yea im good at with back space... shooting for 11x15, 5.5 in 5.5 out. typically peeps run 4 out 6 in to be on the safe side but i wanted to maximize the deep dish.

its a M491 car...930 chassis. yes its just a toy for the weekends or trackdays. Ive driven a buddy's 930 with steam rollers 255-315 which has more camber. he is 11-1/2 et 6 but dont have to shim it out cuz the hub face isnt as flat as the E50's

his car tracks beautifully with good even wear according to him. my old 930 was an extreme pig with the stockish camber. u just have to take the corners with vigor to get even wear :-). far too many 930's are bought, set up and used for cars and coffee imo

dont know yet, 275 hoosiers are kinda tall or short depending on profile, TB's and pirelli Classic Corsas are nice but $$$$ and the fronts are kinda of narrow compared to the rear sizes. They got some interesting sizes avalible with the great looking new pirelli trofero R compounds in 16's now...i hope they start doing 15's in the near future.

when u ran a 1/8" spacer did the hubcentric flange still have enough bite to the wheels? the narrowest hubcentric spacer i found was 7mm.

warm regards

gumba · 05-25-2016, 06:55 AM

I'd still run 4 out/6in to give yourself some adjustment just in case the fender width's aren't exactly the same.
On our '75 RS look race car (turbo body) I ran 255 fronts and either 275's or 315's rear Hoosiers. 2.8 front camber and 3.2 rear, very even tire wear. The problem with running that on the street is the car is pretty twitchy. For the street running 9 & 11x17" wheels with Goodyears I ran 1.5 front and 2.0 rear. The TB's are very sensitive to camber. I run 1.5 front and 0 back with even tire wear on the DP. Running that much camber with the TB's will cause very uneven tire wear.
The hubcentric flange still has enough bite with the 1/8" spacers.

panzerfaust · 05-25-2016, 09:20 AM

Good to know the tb's camber characteristics... That way I know I cant rely on the extra camber with specific tires to help with the clearance. So maybe I'll play it safe and do 5 out and 6 in with a 7+ hub centric spacers.

Many thanks for the guidance.

gumba · 05-25-2016, 09:57 AM

With the 315/35/17's on 11's I ran 6.5 backspacing with a spacer to move the wheel out. The 11x15 Fuchs had 5.5 backspacing and worked with the 295 TB's. The 335/35/15's will protrude out too far. The photo is with the 11x17's w/315/35/17

panzerfaust · 05-25-2016, 12:50 PM

yes tires matter alot too... tb's are typically stretched. i.e 215/225 or 18/60/15 9 is a pretty narrow tire over wide wheels. combine with -neg camber, wheel travel arc and tapering of the tires sidewalls, u can move the wheel out further than a "muffin top" tire much wider than the rim. you loose tire turn in response with a tire too wide for the rim. the trend has been fitting wider tires on narrow rims but it has nothing to do with safety or performance. I dont want to open that can of worms here on pelican.

so your tb/fuchs set up is really what im trying to get to. 5.5 and 5.5 out..plus the extra flange dimensions. E50 flanges measured from the bead area to rim edge are surprisingly small compared to other wheels. like less than 1/2 inch.

some tire stretch better than others, 265 would be the min i would run on a 11, 285 would be the max. 11.5x17 are nice with 315. im not jumping into the 17's at the moment since i glutting for punishment with the 15's and tire choices..lol

gumba · 05-25-2016, 04:29 PM

I've run the TB 215's on 8's & 9's, they run wider than they appear. I've run the TB 270's & 295's on the 11's. The 215's, 295's and 335's are all about 24" tall, the 270's are about 25.6 tall (which is way too tall for me. The 265's I've seen are over 26's tall.
I like the look of the 15" wheels with TB's much better than the 17's.

RarlyL8 · RarlyL8's Garage

Decide what tires you are going to run before you build the wheels.

I ran 345/35-15 for many years on 12x15 Fuchs with no issues. They are extreme and you have no room left anywhere once they are properly fit.

Currently running 315/35-17 on 12.5x17 Fuchs (thank you Harold) with no issues. The wider wheels pull the tires out so they fill the well nicely. Section width on the 345/15 and 315/17 combos are the same (13.5") due to the different wheel widths.

madkow · 05-25-2016, 09:42 PM

Porsche had a BBS RSR 5 bolt with center cap style offering I think starting in 1980. The tire rim option with spacers enabled 345 35 15 Lamborghini Countach tires to fit the back. There's probably about a 1/2 inch clearance between the oil line and the tire on the right rear side of my car but I would assume Porsche knew what they were doing.

VZ935 · VZ935's Garage

That set up looks nasty. Very nice !

Quote:

Originally Posted by RarlyL8

Decide what tires you are going to run before you build the wheels.

I ran 345/35-15 for many years on 12x15 Fuchs with no issues. They are extreme and you have no room left anywhere once they are properly fit.

Currently running 315/35-17 on 12.5x17 Fuchs (thank you Harold) with no issues. The wider wheels pull the tires out so they fill the well nicely. Section width on the 345/15 and 315/17 combos are the same (13.5") due to the different wheel widths.