freeman

Several years ago I bought a "donut" spare (5.5x16 ET10 99636215001) from a dismantled 996 for use on my 2013 991 C2. I also purchased a 7 mm spacer and 5 extension bolts. My 2013 991 had 19" wheels. I sold the 2013 991 in February with the spare and accessories. I recently took delivery of a 2015 991 GTS with 20" wheels. I would like to replace it with a new spare tire/wheel. Would the previous donut spare and spacer still be acceptable? If not, what dimension spare and spacer should I be looking for?

stom_m3

An alternative is to buy a plug kit and compressor. The compressor I use is Masterflow Tsunami MF-1050 (buy extra fuses). Mine has been very reliable and use it for my off road tires to re-inflate after airing down. It should fill the standard p-car tire in about 2 min from 0 psi. As for the plug kit, whatever they have at the auto parts store. The nice thing is the weight/packaging. The compressor comes in a small carrying case which will easily fit the plug kit. Total cost ~$60.

Larry Cable

Since I doubt that the diameter of the spare matches that of the 20" I dont believe that the results will be drivable or safe.

MKW

I carry a simple, $30 total, compressor and a plug kit in every car tire/screw in tread situations , even those with donut or full size spares ...why waste time changing tires when you can plug and pump and be on your way in minutes w/o calling roadside assist, emptying trunk for access to spare , etc., etcand on a 911 jam the big rear tire somehow into back seat area if you have a passenger .

Plugging a leaking tire on the spot due to screw or nail is so easy that an older child can do it...just look at some youtube videos ! Then when you get home, just replace the tire or have local tire place put additional protection of a patch on the inside to supplement the plug , depending on tire age and tire intended use ...low speed commuter vanilla car ( plug/patch ) or GT3 used at the track ( new tire !) Simple as that .

Think also about it happening with your loaded SUV on family vacation...now you could be limited to crawling at 50 with a bagel sized spare tire with 5-7 people and 590 lbs luggage barely half way towards Las Vegas in 117 degree heat .....no thanks !

Larry Cable

+1

DaveGee

Don't newer Porsches come with a compressor?

(Yes, I could just look but the car isn't with me right now)

DaveGee

Larry Cable

yes

LCW

Forgive me, but don't all Porsches come with roadside assistance included? If you get a flat, you just call them and they put in on a flatbed... What am I missing?

ltdodge

i bought a kit from slime at Target that comes with a small compressor and goop. i also have a plug kit. i would not use the one from porsche, i am sure it will cost over $200 to replace with a new one when you use it. the one from target was $30

freeman

The "goop" or "slime" that comes with your Porsche and its compressor destroys the Tire Pressure Monitoring System (TPMS) that comes on your car. So, if you use the "goop", you will have to replace the tire AND its monitoring system. Not reasonable! Sounds as if we are regressing to the Pleistocene!!! Porsche's Roadside Assistance will necessitate at least one overnight stay in the desirous location of your choice when the nearest dealer must "order" the tire. Consult the folks who visit the Black Hills in a few weeks.

Larry Cable

Note if you are on CLs going with the goop is probably the best route to go, since its unlikely that anyone other than a dealer will have the tools to deal with CL rims

freeman

Strangely, just after I wrote the post, I went to the garage to get into my 2015 Carrera GTS to attend a very important meeting. The TPMS message on the left rear said -20 PSI. We went on a great trip yesterday with local Porschophiles. I subsequently inspected the tire and had a very small nail through the tread at 3500 miles. It is the third damage I have had in my 991s below 6000 miles. These guys fixed it (?). I chose to come home and missed my meeting. I am plagued with left rear tire damage. All three were in the left rear. However, during the repair, I found a supplier of 305/30/20 MPSS who promises delivery in October

Larry Cable

really who?

MKW

was told long long time ago by a seasoned tire installer that rear tires get 90% of the nails..you would think it would be the opposite

his theory was that the passing front tire twirls and " stands " up the screw or nail just long enough for the innocent trailing tire to literally get "screwed " !

pfan

Are you guys able to plug a rear tire without removing the wheel? If not, I guess that means carrying a jack as well.