Will these Factory 19" 997 C4S rims fit on my 996 C4S

Hi was hoping someone could answer this for me: I found this set of factory wheels from a 2007 C4S with near new Pilots for a great price. Will they fit on my 2003 996 C4S? Thanks, Ryan

Personally, I'd stay away from 19's with rubber bands for tires.

They are 30 series in the back just like the 295/30/18 rear tires on the car now. So wouldn't they both be rubber-bands based on that logic...or do you personally prefer 35 series out back?

Also can anyone identify these wheels? Thanks!

If they are OEM they are BBS, offsets should be stamped on the back and yes, they should fit just fine..... someone correct me if i'm wrong pls. Also, i'm on 19s in the rough seattle streets on H&Rs, not that bad, a little rough and loud but looks good and handling is great.

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Thanks Michalik. Turns out they are CH-R 108 ET51 and 112 ET45 For the price with Michelin Pilots (even if they end up being 295 instead of 305 in the back), I don't see how I could possibly go wrong. They just need to be cleaned.

I'm no 997 expert, but didn't recognize those as oem. The CH-R looks amazing on a 996, but they are one of the heavier wheels BBS makes. Just a head's up, sidewall metric is just one of a three that dictate overall sidewall height. In other words not all 30 series tires have the same sidewall height. For example, comparing a 295/30/r18 to a 305/30/r18 tire you mentioned, the 305 is actually 6mm taller (not just wider) than the 295. If your going from 18's to 19's, the difference is even greater. Additionally, one brand's 30 series may be shorter than another's so there's a lot to consider given the tight tolerances of the 911. Having said all that, provided the offsets on those wheels are correct for your car, you should be fine, but the ride will be a more harsh (if your coming from 18's) and the added unsprung weight of the larger 19's will so slightly affect performance.

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Thaks for the response Jilphan. My car has had the RWD conversion done so hopefully an increase in weight over the Turbo Twists will still be canceled out by the removed front drivetrain.

Post pictures!

Glad to help. I would love your input on the before/after the awd delete. I�ve been contemplating the same given I recently had a c2 for a week and really enjoyed the livelier rear end of the c2. Unfortunaly your comparing sprung weight reduction to the addition of unsprung weight. The two are not the same. A lb or two of wheel/tire weight has infinitely more effect on performance vs removing parts that are tied to the chassis. Fortunately, you have well over 300hp at your disposal so unless your tracking the car or driving like a maniac on the street, this shouldn�t impact your daily driving experience too much.

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Hey brother, thought I'd chime in because it looks like you're looking for some info/experience. I have an '03 C4S coupe 6spd that had 59k miles on it when I bought it last summer. I was looking for a C2 for the RWD, but a deal came up I couldn't pass up (plus, why say no to 'dat wide-booty). Anyways, always thought the idea of an AWD Carrera was silly, since I wasn't going to be winter driving mine anyways. It's a 3 hour, bolts only operation that is completely reversible, and it's fairly well documented that removal of the front drive train is minus 80 lbs and plus 11 AWHP. That's -80 lbs and plus 11 hp, for free?? Most of us are willing to shell out $800 for an NA tune that may or may not add 5 whp, so sign me up! I don't mean to start up a separate discussion here, but simply put, our AWD systems do not actually do anything. I completely understand how the viscous diff is supposed to work in theory, but you can watch any number of videos on youtube, and you will see that in slippery conditions there is clearly 0% torque going to the front wheels: You Tube You Tube You Tube You Tube (My favorite part is all of the kids in the comments on each video saying that it can't be a C4S because the front wheels don't move - jokes on both you, and us kiddo!) If it can't work after many seconds in the most basic of non-equal wheel speed scenarios, you'd have to be out of your mind to think it's doing anything on a track, or at high speeds when the slip is significantly less than that of in the above videos. My point is, yeah, go ahead and do it. Loose the weight, and gain a few horses is you want the car to feel a touch sharper. The grip wont feel any different for you after, because it isn't, which is great! I think it sharpens up the car nicely, and combined with a GT3 TB, plenum, tune, pss10s, lightweight battery, exhaust, underdrivepulley really made my car feel like going from lackluster to nice and sharp (my car dyno'ed 293 rwhp and 254 rw ftlbs too!). Notes: 1. While it is "reversible" you will most likely destroy your axles figuring out how to separate them, unless you know some sort of way to repack those bearings and put the snap ring back on. Better to wait to find a pair of "stub" axles for sale from one of the turbo guys. I torched mine, because I don't tolerate snap rings. Or have the correct pliers. 2. It is possible the car does in fact understeer more now that 80lbs is missing from right in front down low and all the way forward. I countered this by adding camber, and using more awesomeness (throttle). Full tank and spare also works. 3. Turns out when you get cabin fever and throw the ol' skis through the sunroof for a 135mph trip to vermont, these cars actually do pretty great in the snow. I do believe it's because all of the weight over the rear axle, even with 300 tread wear summer tires. (I even went out and bought those super zip ties, because i thought for sure I'd be getting stuck in the parking lots, but didn't) Now to figure out how to make these god damn pictures not gigantic. God I hate the photo interface on all these forum templates.... now go forth and kick RWD ***! kljAVbOl.jpg GSsfSC2l.jpg hF1wEEPl.jpg

Just spoke with Vivid Racing. They are the correct offset for my car, shod with 305/235 Pilots, and I just got the deal of the century! I also got a full spare set of lug nuts. I will post pics when my car arrives and I bolt them on and post some feedback on the RWD conversion. Question: I like the look of the BBS caps vs the Porsche ones. Does anyone know the proper BBS center cap size for these rims? 70/64mm? (They went straight into my storage space and didn't remember to grab one.) Thanks again everyone! I can't WAIT to get my new DD (IMS/RMS, Clutch and flywheel is already done 66K original miles!) All services and fluids are up to date. I'll just give it a quick once-over on a rack maybe get it aligned, start saving for coil-overs (Maybe H&R or Ohlins) and enjoy my new C4S RWD! -Ryan

Clever using "Mike Snow" for your soundtrack Orangeman! lol!

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Awesome man, are you upstate? Can't wait to see your car with those wheels. Get those headlights polished and your car will be a 10/10. Is your car silver with tan interior? I bet that's rare! Send more pics!

Orangeman: The car is coming from Morrisonville (BFE) and lived in AZ for its first 42K miles. The owner did NOT market it well and I'm a bit obsessed with Searchtempest so it was a lucky find for me. Current owner is an engineer at Volvo and refuses to take the car out in the winter. It's immaculate. The car is low optioned (no satnav or sport exhaust- no dated distractions but also no hardbacks bummer) but got the full leather option in Sand beige with alcantara headliner. Not my first choice in interior color but could not argue with the IMS/RMS clutch and flywheel done at Becks Performance in Scottsdale a couple years ago right when the current owner bought it...or the price I paid! BTW it was a special order car from the original owner. The dealership asked to buy it from him when it arrived. I tracked down the AZ owner and he said he still had the stock rear taillight lenses that he'd be happy to ship me at no cost. Gotta love "Porsche People"!!! It's like how BMW used to be before the Stance/fart-can-DIY (but I really shouldn't) crowd showed up. (I'm an air-cooled G body Outlaw owner currently after selling my Inka Orange '72 2002 to buy my first 911 ) My BMW 335i MSport lease was up and I decided, as many have, that 996 C4S is the best Porsche bang for the buck on the planet at the moment and would make a fun and reliable daily given its state of repair, records, and owners. Naturally, she's getting a full detail when she arrives.

Out of curiosity, what are the widths on the fronts and rears? Just bought a set of 19s from a fellow RLer this winter and will be throwing them on soon after a little refurbishing. Looks like you got one heck of a deal if they clean up nice.

8.5 with 235 and 12 with 305. Yeah the nice, but confused guy I bought them from thought they'd fit on his Fox Body Mustang.

Wow 12" on the rear. Looking forward to seeing them on your car!

Me too!

Man, those Porsche engineers are dumb. Putting in an AWD system that doesn't work. Stupid. I'm sure someone smarter then me will chime in but I'm pretty sure the AWD was not done to be better in the snow.

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Lol, yeah, totally man NO company has EVER sold something that delivered less than 100% of what they promised - ha ha. No SMART GERMAN engineer would ever make a car with an un-oil-fed bearing that could fail either, right? No accountant ever affected design either, (like with a headlight housing), right? So why don't you go ahead and show/tell us what exactly the vicious diff does? Because it clearly doesn't transfer any meaningful torque, at least now, after 15 years. And there is also totally no reason they completely changed the system for the 997.2s, which does work in slippery conditions right? I mean if the old one worked so well.... Know how this all came about? Because I thought the same thing you did, so I jacked my car up off all four wheels and and put it in gear, all for wheels spun, yay, it works! Right? I told my indy porsche mechanic that and do you know what he said? He laughed and said, yeah but did you try to stop it with your hands? Huh? Yeah he said, the wheels may spin off the ground, but there is no real torque going to them, so you could stop the wheel spinning with your hands and a pair of cotton gloves. So I tried it again, and sure enough he was right. Again, my car was 14 years old with 59k miles on it, but I also just showed you 4 videos of other cars with the exact same thing....

Nothing is perfect and everything fails at some point (there have been books on the IMS can of worms, the numbers and percentages are worth looking at), and to each their own as far as modding your car. Try putting on those cotton gloves and put them over a light bulb, it block the light but it doesn't meant the light is not shinning and we don't go around taking out light bulbs

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Hey man, I appreciate you keeping it light (no pun intended), and I definitely appreciate an artfully implemented metaphor, but in this case I just don't think it holds up. A covered light can be uncovered and it fulfills 100% of its intended function. When we uncover the figurative light (in these youtube videos, in real world driving), we can see something [isn't] going on. For the record I'd love to be wrong; I'm literally invested into a car that I hope is worth more and has added functionality. Unfortunately, I am just not seeing any evidence at all that that is the case, and I tihnk others agree. Would love to hear others opinions or evidence. I also believe its entirely conceivable that like an LSD, it worked in the beginning but now no longer does. The difference is of course that our front diffs are not serviceable, and supposedly lifetime, and everyone knows an lsd needs to be checked and reclutched.

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Really appreciate your insight orangman. I just spent a grand on inner/outter boots, so clearly the AWD delete is something I hadn't planned on doing tomorrow, but do keep thinking about. Luckily, i have time, as there are a heap of other things i wanna do first. I am curious on one other thing though -- what got me into a 996 in the first place was a week i spent in one last year that made me fall in love. Particularly the steering. While it's a very different car from the air-cooled cars that came before it, the 996 still has that 911 steering feel that is like no other. I just don't get the same thing from the C4s. Would you be able to speak to the delete giving a much more C2 type steering feel? I can't see how it wouldn't, but until i do it myself (or drive a deleted car), i won't know. Beautiful car Ryan! If it were mine, I'd swap out the tan carpets for black and consider that one of the best color combos out there -- I know most will disagree, but I'm one of those weirdos that believes a car should be black, white or silver. Can't wait to see what the car looks like w/ the CH-Rs, please do come back and share pix! And apologies, i feel like i may have caused folks to poop all over your thread -- that was not the intention. To those thread poopers: I'm POSITIVELY CERTAIN that ANY Porsche engineer in Stuttgart is infinitely more knowledgeable than I about putting these things together. I'm certain the C4s was faster around the Nurburgring with the AWD than w/o.... that's not the point. I just like the idea of a 2wd 911, it's just that simple. I also love the idea of a widebody 911. And I can't realistically afford (and maintain) any other 911. And if orangeman and I ultimately do something to adversely affect the performance of the car but we enjoy it more, who the F cares? No one should, cause it's our cars and not your's.

There are plenty of examples of C4s going around tracks faster than their C2 counter-parts. Clearly the AWD system provides some benefits. FYI - when I was testing my new clutch engagement on jack stands the front wheels began turning immediately. Maybe in some of the earlier videos their AWD system was worn and not functioning properly.

I'd say functionality is certainly a potential issue. As part of the drivetrain, the AWD is a wear item that to my knowledge is not a service item, so yeah, I'm sure not all of 'em are functioning properly. Had to touch this one last time as i thought it hilarious today's front page news story: 911's AWD SYSTEM CELEBRATES 30 YEARS OF PERFORMANCE In that story, 911 head August Achleitner refers to the AWD system as a "hang on" front axle, meaning no power goes to the front wheels unless needed. So in those videos orangeman posted, either those systems were faulty, or the car's ecu didn't think power was needed up front, lol. I did some reading about this system upon purchase, but never could find out when/how much power could be diverted to the front.

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I believe its up to 40% power but I could be wrong. The system works entirely mechanically (at least in the 996) and uses a viscous clutch/couplilng that heats up when front and rear speeds are different, the heat results in friction and the clutch engages.

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Unfortunately I can't, because when I did mine I added PSS10s, so it would be completely unfair for me to judge the before and after steering feel with simply removing the drivetrain.

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But like... ALL of them are faulty? Including the (at the time 3 year old 2008 997 C4S? Mine was faulty too? The system is 100% mechanical, and in a way not even mechanical in the traditional sense, but controlled by thermodynamics and the shearing of the fluids, ECU has nothing to do with it, unless I supposed applying brakes independently as part of the traction control system.

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Where are they man (the examples)? A C4S also has better brakes, suspension and a stiffer chassis, so I have no doubt it could be faster around a track than a C2. Are there any tests of a 996.1 C2 vs C4? Would an AWD system really make a 296 hp car faster around a dry track? I don't remember seeing any NON marketing material claiming a C4 is faster (especially when you consider the +80 lbs and -3% drivetrain loss). Anyone live somewhere snowy and wet with a C4 or 4S? Care to take a video and see if the front tires will engage? Can a mod split this thread into its own new topic?

S'all good! threads have a way of taking on a life of their own and I see it as an opportunity to learn and meet other C4S owners who have done what I want to do. The respray and carpet on my G body has set me back a few but the coffers will be full again soon. I just want to do the right mods and avoid the "slippery slope" on what is intended to be my daily driver. Picking up those wheels and tires for roughly the cost of a good set of tires for my stock wheels certainly gave me some room to play. Right place - right time Facebook Marketplace of all places..poorly marketed once again! Thanks again everyone for the posts! -Ryan

I myself like the look of 19" wheels. Although many will say that the ride is harsher, I do not feel much difference at all, in fact, I feel like there is less tire roll when into the corners. As for the additional unsprug weight of 19", my wheels actually saved approx 35 lbs with 19" over the OEM 18" wheels, plus an additional weight saving of .4 lbs per wheel going with titanium lugs and the tires themselves were almost identical in weight.

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You Tube

Cheers, sarcasm is hard to detect and the beautiful things is we can all have an opinion and agree to disagree.......and for the record i prefer rwd cars too. I'm a noob to Porsche and here to learn.