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Ok ok nuff with the he said she said...... You can fit 991 20' wheels on a 997 the ride comfort will improve, there is no difference in the rubber profile from a 19' wheel, fronts 35' rears 30' and on a 20' wheels, fronts 35' rears 30' profile, only the rims are bigger from 19' to 20 inches, now, I think the ride is better because I believe the tire walls are stiffer as I have noticed a more comfortable damping feel on bumps and potholes, so an improvement to the 19s rubber, there are some right fools out there 'about the ride will suffer, where do these people come from with their opinions' do your homework then make a valuable opinion, so others can be informed.... Ask any 991 driver if the ride in harsh and I don't think Porsche would make it next gen 911 a worst and uncomfortable ride do you .... Now, as for 18' for track I can't see the logic in this but that's another bag of weed to smoke haha I don't smoke ... Moving on ,,, so you are thinking of going BIG, good boy or girl, here the pros and cons if you get the right offset wheels anything is possible I have a slim body 997 Carrera S running 991 20' wheels ,,, rubber boots 245-35-20 rims 8.5j / 20' offset 51' that the front; now the only problem with the front are the 245 tires with the standard Spring support touch, so to get out of jail, you would need to replace the tires to the 997 standard 235 tire 35-20 to stop the rubbing or add a 5mm spacer at front but this pushes the rubbers out pass the arches this will effect cornering speeds,,,, the best solution would be to upgrade your suspension support to coilovers springs and it's a win win situation all the way to the bank, you can keep the 245 rubbers without spacers giving you a wider track at stock heights or you have the option to lower your car and the car will look slam, get all the wheels aligned and they will be no rubbing.... My 991 rears rubbers are 295-30-20 rims 11j / 20 offset 52' nothing to say here they fit no spacers required but you know, there room for a 21' rims here, 991 GT3RS anyone hmmmmm ...... P.s.....Porsche wouldn't give the 991 GT3RS MONSTER 20' front and 21'at the rears for track days 'IF' 18' wheels was the only option for track Manoeuvring, you may as well add skateboard kryptonic wheels to your Porsche the RED ONES not the Green or blue MMMMMM
Thanks for that ,,, that's just it ,,, it's standard / stock hight, the 20" wheels just fill up the redundant space from the 19' I am rolling with a 5mm spacer at the front to stop the rubbing on the springs support, a stop gap untill I get a set of coil-overs struts then we are in business ...
Interesting. On most cars, certainly on a turbo, you can't run stock 991 rubber with those wheels. The tires are way too tall. At the least, you speedo will be off by a significant margin. For a turbo, the effects will be worse. For 20s you should have aspect ratios of 30 in the front and 25 in the rear. Others have run 991 wheels, but always switch the tires. The front tires you are running are a full inch greater in diameter than stock.
Interesting info. I've seen some post saying that the 245/35/20 is too tall and would rub the spring perches on the front suspension. Are you running the 991 stock 245/35/20 sized tires? This gives me hope of getting more rubber on my 20" wheels.
Originally Posted by iandiman
Ok ok nuff with the he said she said...... You can fit 991 20' wheels on a 997 the ride comfort will improve, there is no difference in the rubber profile from a 19' wheel, fronts 35' rears 30' and on a 20' wheels, fronts 35' rears 30' profile, only the rims are bigger from 19' to 20 inches, now, I think the ride is better because I believe the tire walls are stiffer as I have noticed a more comfortable damping feel on bumps and potholes, so an improvement to the 19s rubber, there are some right fools out there 'about the ride will suffer, where do these people come from with their opinions' do your homework then make a valuable opinion, so others can be informed.... Ask any 991 driver if the ride in harsh and I don't think Porsche would make it next gen 911 a worst and uncomfortable ride do you ....
Now, as for 18' for track I can't see the logic in this but that's another bag of weed to smoke haha I don't smoke ... Moving on ,,,
so you are thinking of going BIG, good boy or girl, here the pros and cons if you get the right offset wheels anything is possible I have a slim body 997 Carrera S running 991 20' wheels ,,, rubber boots 245-35-20 rims 8.5j / 20' offset 51' that the front; now the only problem with the front are the 245 tires with the standard Spring support touch, so to get out of jail, you would need to replace the tires to the 997 standard 235 tire 35-20 to stop the rubbing or add a 5mm spacer at front but this pushes the rubbers out pass the arches this will effect cornering speeds,,,,
the best solution would be to upgrade your suspension support to coilovers springs and it's a win win situation all the way to the bank, you can keep the 245 rubbers without spacers giving you a wider track at stock heights or you have the option to lower your car and the car will look slam, get all the wheels aligned and they will be no rubbing.... My 991 rears rubbers are 295-30-20 rims 11j / 20 offset 52' nothing to say here they fit no spacers required but you know, there room for a 21' rims here, 991 GT3RS anyone hmmmmm ......
P.s.....Porsche wouldn't give the 991 GT3RS MONSTER 20' front and 21'at the rears for track days 'IF' 18' wheels was the only option for track Manoeuvring, you may as well add skateboard kryptonic wheels to your Porsche the RED ONES not the Green or blue MMMMMM
Interesting info. I've seen some post saying that the 245/35/20 is too tall and would rub the spring perches on the front suspension. Are you running the 991 stock 245/35/20 sized tires? This gives me hope of getting more rubber on my 20" wheels.
Yes I am running the stock 245 34 20 up front and yes they do rub a dub dub on the spring Perches as I said in my long speech above,,, you will need a 5mm or 7mm spacer to keep them away from the Perch but this is a temporary fix you can drive the car on a day to day it's very comfortable to run but i would highly recommend you upgrade the fronts to coilovers about
£2500 as a better solution if you want to rag the car like you stole it ... With the standard setup on the 997 the the suspension is too soft for vigourous driving with 20 inch and the 245s they will still rub if you hit very bumpy roads and if you take the car pass 70mph other wise if you are just cruising they are fine
Agree - I think 20's draw a viewer's focus to the disc which are better sized inside a 19...20's make the disc look small.
Don't worry about that that's temporary ,,, I will be upgrading the brakes to the 6 pack big stuff soon ,,,, and for my next trick,,,, centre locking wheels with new hubs it's all part of the fun I tell you ....
It's called individualism some of you get it and some you don't, unless it comes from horses mouth at Porsche ,,,, so here is a video from Porsche that's spells it out ,, enjoy ...
Hi all, I'm trying this now as well. Firstly, I agree with iandiman on all his points. This car is a 2006 911 4S. These 991 wheels currently have stock size 991 rubber on them (Pzeros). The rears are fine without spacers and could use light spacers.
The fronts are 20x8.5 et51 and do stick out a little from the fender. The 991 tire (245/35/20) rubs on the bottom of the spring perch. It can be turned by hand but drags; interference is guessing less than 1/8 inch when in the air (no car weight load, which may cause the sidewalls to flex a bit and cause a bit more interference). The tire also hits the front inner wheel well plastic when turning left/right. I am considering getting 235/30/20 tires for the front, which put the tire dimensions back to 997 size but may look silly, and the tire would still be out. Effectively this size removes 1/2 inch from the sidewall and gives it to the wheel.
This wheel style is also available for 981 front in a 20x8" width and higher offset which IMHO is a better solution for a 997 and would fit the 235/30/20 tire size better. I am interested in finding a set of those 981 fronts.
The big question I guess is does 235/30 on the front cripple the car for hard driving on imperfect roads? It might. Sidewall would be 7 cm which sounds like a lot but I think 2 of those are covered by the wheel lip. I may end up putting 997 wheels back on.
I bought new 235/30/20 tires for the front (Michelin PS 4S). This front tire size clears the strut spring perch and the front of the inner wheel well but because it's an AWD car I can tell the driveline is under increased load from the 3% difference between front and rear tire diameters. I could get smaller rear tires (25 profile) but I've decided to go back to 997 (19") wheels, mainly for durability over potholes and knowing I've got enough rubber to protect the wheels. We did an A/B drive test comparing the 19" and 20" wheels and the 19"s felt a lot "free-er."
I don't know if the offsets are ideal but this setup is still feasible for RWD cars.
03-12-2016, 06:58 PM
it's all part of the fun I tell you ....
