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2019 9Y0 turbo staggered wheels on 2013 958.1 and weight comparison
So I upgraded the 19-inch wheels on my 2013 958.1 Cayenne to 2019 9Y0 21-inch OEM Turbo staggered wheels.
I decided to weight them because both sets of wheels are wearing the same tire brand and model, the Pirelli Scorpion Verde.
Weight Comparison:
2013 958.1 Front and Rear
19x8.5 ET59 wheel with 265/50 R19 Pirelli Scorpion Verde tire:
63 pounds, 9.8 ounces.
2019 9Y0 Front
21x9.5 ET 46 wheel with 285/40 R21 Pirelli Scorpion Verde tire:
64 pounds, 9.3 ounces
2019 9Y0 Rear
21x11 ET 58wheel with 315/35 R21 Pirelli Scorpion Verde tire:
67 pounds, 9.1 ounces
Interestingly, the larger wider 9Y0 turbo wheels with tires were about the same weight as the smaller narrower 958.1 wheels with tires.
First few pictures:
I changed the transfer case fluid to Ravenol J1C1125 Transfer Case Fluid TF-0870 - Full Synthetic, partially to get the nice bottle with fill spout, which did make the job easy. Planning to order Porsche Transfer Case fluid part number ending in -63 for a follow-up fluid change in a few weeks.
Last edited by Rennmaschine; 03-18-2019 at 09:18 PM.
Noticed any handling differences? Staggering should help turn in a little
Haven’t had a chance to vigorously test the handling yet, but the grip is better. Also the ride is nicer than I thought it would be moving from 19s to 21s.
Last edited by Rennmaschine; 03-16-2019 at 02:11 PM.
Wow, I would have thought there would be a LOT more weight difference!
(My brain already hurts today so I won't think about the weight of the wheel barrel being 1" further away and how that increases effective mass, blah blah blah.. This isn't a race car. )
958 Turbo Wheels: 21x10 with 50mm offset
9Y0 wheels Rear: 21x11 with 58mm offset
9Y0 wheels Front: 21x9.5 with 46mm offset
So I upgraded from 19" to 21" wheels, but for reference I did a comparison of 9Y0 turbo wheels vs 958 turbo wheels, as that's the most aggressive fitment offered by Porsche for the 958, and it looks good. The outside face of the 11" wide 9Y0 Turbo rear wheel sticks out 4.7mm more than a 958 Turbo wheel, as most of the new width goes under the vehicle due to the 58mm offset (vs 50mm offset of 958 turbo wheels).
The outside face of the 9Y0 front wheel sticks in only 2.3mm more than a 958 Turbo wheel even though the 9Y0 wheels are half an inch narrower, because of the offset of 46mm instead of 50mm.
Lastly, the use of 9Y0 21" tire sizes has increased sidewall height by a small amount (roughly 8-10mm over a 21" 958 turbo tire). This might be partially responsible for the better than expected ride quality when I moved from 19" to 21". I really expected the ride to be harsh, but it isn't.
The slightly larger rolling diameter of the 9Y0 tires (vs 19" 958 tires) also affect gearing a little bit, feeling ever so slightly less lively off the line in standard mode. Since some people on the forum are running 295/40 R21 instead of 295/35 R21, I wonder if they notice any difference there with the gearing. I may see what clearing the transmission and throttle adaptations will do for this.
The new wider Scorpion Verdes are much quieter than my old worn Scorpion Verdes, and the grip is better too.
So Tire Rack's specs for the Scorpion Verde in 958 19" size indicates a weight of 36 pounds. Their specs for 9Y0 sizes indicates a weight of 32 pounds for the front and a weight of 34 pounds for the rear, with 693 revs per mile for the front and 701 revs per mile for the rear.
I just changed my transfer case fluid to Ravenol a few days ago for the first time. Car has 84K miles on it, and I bought it with 74K on it. Fluid was dark, but did not smell burned. There is no record of the TC having been replaced or fluid changed before. I will drain and refill the TC in about a month with the Porsche -63 transfer case fluid. I intend to change the fluid every 10k miles (with every engine oil change).
How's the ride? I'm comparing the new 21" tires to the old 19" tires, and the ride is less harsh than I expected for 21s. Also, the 50-aspect ratio of the 19s had detectible wallow to me, while the 21s don't. Steering responsiveness is also improved, feels a bit more crisp, probably due to the shorter sidewall. The ride to me is sporty yet still civilized. I haven't had a chance to test the limits of the tires hard into the corners yet, but they are only all seasons, but that's what I need here in the Pacific Northwest. I'm having TPMS for 958.1 installed tomorrow. I would expect a staggered fitment to introduce a little understeer when going hard into corners, but I haven't tested that yet. The thing I really noticed more than anything is the increased grip.
Last edited by Rennmaschine; 03-19-2019 at 12:05 AM.
Do you have any lower pics of the rear end? I always thought the 21x10s looked a little wimpy esp compared to the x5/x5m. Thx! Looks sharp
First of all, I need to apologize for the atrocious quality of one of the two pics I'm about to post. One was a low light picture that became grainy upon brightening it up. It was important to brighten it up so you could see into the shadow areas. I'll get a better picture later. For now, maybe these two will help.
low light pic that became grainy upon brightening it up, but at least you can see into the shadows now. You can clearly see 3 tires making contact with the ground, hopefully helping you to gauge how the staggered wheels look. Will try to post a better lit picture of this angle in the future.
Very interesting.
For years, we had a 955 gen 1 (cs tit edition), that came with staggered "techno 20" wheels. (That car had also air suspension.)
I had many sets (4 or 5) of Vredstein ultrac sessanta, 275x40 front and 315x35 rear, and always loved the handling, particularly when towing a boat (an heavy, 6000 lbs). At that time we did few San Francisco to Newport Beach , ie.: long towing rides, and really loved the handling difference.
After more than 110k miles, the cs tit edit has been sold and replaced by a ctt, ..that has oem 20 on all corners.
(note, since 2 sets, I use P zero rosso N1). Current set 275x45, and previous set was 275x40 (to try to keep it a bit lower !)
Looking at what you have done, I think I will try a staggered solution. Btw, the look is real nice and clean, very elegant.
Well done.
FWIW, I have the Turbo II design wheels on my 958.2 GTS which is 21X10 50et. Square setup (all corners) now i ordered forged wheels here my specs: 10.5X21 25et deep concave setup, and wheels should weight less than HALF of the OEM turbo wheels!! Also fitment will be on the very edge of the fender!! So something to keep in mind when getting new wheels for our Cayenne, is aftermarket route, which doesnt seems to be popular on here!!
How’s the drive with staggered wheels? I thought our 958 were so sensitive that worn rear tires could effect our weak transfer case.
Interesting question - but since they are Porsche Cayenne wheels (albeit from a newer model) - I would imagine Porsche spec'd tire sizes with equivalent rolling diameters. There are calculators to figure that sort of thing out if you're really curious.
That's a very good weight for such a large wheel but they're stock Porsche. 958 stock Turbo IIs are supposed to be forged (probably 9Y0 too by the looks of it). Aftermarket Turbo IIs are cast and much heavier.
FWIW, I have the Turbo II design wheels on my 958.2 GTS which is 21X10 50et. Square setup (all corners) now i ordered forged wheels here my specs: 10.5X21 25et deep concave setup, and wheels should weight less than HALF of the OEM turbo wheels!! Also fitment will be on the very edge of the fender!! So something to keep in mind when getting new wheels for our Cayenne, is aftermarket route, which doesnt seems to be popular on here!!
I was looking at exactly this set of wheels, in brushed dark black finish, but I opted to go with the Porsche OEM wheels because I know they are rated for towing 7700 pounds. Please do post some pics of your Signature wheels if/when you get them mounted.
Interesting question - but since they are Porsche Cayenne wheels (albeit from a newer model) - I would imagine Porsche spec'd tire sizes with equivalent rolling diameters. There are calculators to figure that sort of thing out if you're really curious.
Just wanted to post a quick update. I swapped out the 285mm front tires for 275mm which results in virtually identical rolling diameter now with the 315 rears:
Stock 9Y0 Rear 315/35R21: 315mm X 35% = 110.25mm sidewall height
Stock 9Y0 Front: 285/40R21: 285mm x 40% = 114mm sidewall height
New Front: 275/40R21: 275mm x 40% = 110mm sidewall height, a much closer match to the rears
So it seems that Porsche has engineered the 9Y0 to run slightly taller sidewall in the front (which means larger rolling diameter). Since the 958s can be sensitive to differences in rolling diameter, I swapped out the fronts for a 275mm tire for a near perfect match to the rears. So far so good, I have put 3200 miles on the 275s now.
03-16-2019, 02:48 AM
2019 9Y0 turbo staggered wheels on 2013 958.1 and weight comparison
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