I finally found the measurements I took from Greg's spare last November. It looks like it will work but it's not entirely simple.
The Turbo has about the same weight on the rear as the M5 on the front and the inside diameter of the Turbo spare wheel is about the same as the inside of the M5 wheel (although the Turbo spare is a 165/70-16, the wheel doesn't have a drop center) so brake clearance is fine.
But of course the bolt circle is different (Porsche 130mm, BMW 120mm) so a wheel adapter is required. The adapter is a little over 1 inch thick which is okay since the BMW front tire is 1.62 wider on each side than the Turbo spare (which also has less positive offset than the M5, .40in.vs .78in.). Clearance is okay, but with the spacer the Turbo spare on the front will have a .6 NEGATIVE offset which will affect steering --- but having a space saver on one side will anyhow and we're talking 50mph max for 50 miles as I recall (Greg, is that right?)
The one dimesion I don't have is the overall diameter as stored deflated (I think it's about nineteen inches -- Greg, could you check this also). The width is 6.2 inches for a volume of .8 cubic feet -- this is less tnan 1/3 the volume of the BMW front wheel/tire assembly.
Now the bad part. Porsche wants $565 for the wheel and tire assembly P/N 99636205000 (Wheel Enchancement in LA will knock 10% off this).
The spacer is $65 (+8% CA tax in CA) +$25 shipping prepaid by check or money order to
Design Deluxe Mfg.
21300 Deering St.
Canoga Park, CA
91304
To mount the spare, you bolt the spacer on with the M5 wheel bolts, then put the spare on with lug nuts (the lug nuts are supposed to fit the BMW lug wrench, but I can't swear to it --the spacer has studs on the Porsche pattern) --and you blow up the spare with you handy M5 pump. Of course you need a jack (which will fit inside the Porsche wheel) and a lug wrench.
Does anybody have a better idea before I spend $600+?
I tried the M5 front wheel as a spare and it really does chew up the trunk room. Driving without a spare is nervous making in areas many miles from service with no cell coverage.
Is there a cheaper solution that this for a space saver spare tire?
i'm not sure if the above from 2001 was ever proven to work? Most of us use an old front wheel and tire. Alternatively, you could find a bmw style 66 wheel which is 17", so a bit smaller and potentially cheaper. A few other 17" wheels can fit as well.
I only use mine when i'm taking a trip, otherwise it sits in my garage.
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Mike
91 M5 Alpine White II, Silver Gray 3/90 production
17x8/17x9 M system with PS2, 20mm touring roll bar; Ground Control Coilovers; EAT Chip, CD43; bmw/nardi blackline steering wheel, 3.8 Cam Gears
08 535i / 6 speed
Space Gray; Gray; Sport/Premium/Nav
00 M5 Ti Silver; Imola/black sportiv --Sold
Engine:
Supersprint Headers, Dinan CAI kit and MAFS, Throttle Bodies, Cams, Ported heads, Exhaust, Custom dinan software, Evosport Pullies, Dinan clutch and lightened flywheel; Ignition solutions plasma coils
Suspension:
Dinan Stage 3 with front and rear Strut Tower Braces, Beastpower Sway bar brackets, Dinan Wheels with 275/285 PilotSport, X5 Thrust arm bushings, Stoptech 355mm 4 piston front, 355mm 2 piston rear brake kit, Dinan 3.45 diff
Interior/Misc:
Eurodash, updated steering wheel, Bluetooth retrofit, Sirius Retrofit, hardwired V1, Widescreen Mk4 nav, M audio retrofit, Ice Link, BSW Stage 1 speaker upgrade, bmw towbar
i'm not sure if the above from 2001 was ever proven to work? Most of us use an old front wheel and tire. Alternatively, you could find a bmw style 66 wheel which is 17", so a bit smaller and potentially cheaper. A few other 17" wheels can fit as well.
I only use mine when i'm taking a trip, otherwise it sits in my garage.
Was hoping for a space saver to.... save trunk space. i dont really want a full size in the trunk, since there is not a wheel well for it.
I had Art Spence of Motorsport Technology - 714-553-3910 make me a custom spacer to go along with a Mercedes donut spare tire he supplied. It is considerably less than $600. I use elastic tiedowns in the trunk to hold it in place.
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DINAN Stage 1 suspension, Intake, Exhaust, MAFS, Stage 3 software and Short Shift.
UMNITZA headlights, HID fogs and backup lights
AGLA steering wheel and arm rest
KENWOOD DNX 7100 &
assorted European goodies and a SPARE tire
Alternatively, you could find a bmw style 66 wheel which is 17", so a bit smaller and potentially cheaper. .
Hmm, assuming you don't change the rolling diameter, wouldn't the overall package size be the same? Smaller wheel, but slightly taller tire to stay around 25.7 inch rolling diameter. I guess the package could be narrower.....
Regards,
Jerry
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'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit, open brake ducts, Hamann front splitters, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, 6k super white low beams, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit
Hmm, assuming you don't change the rolling diameter, wouldn't the overall package size be the same? Smaller wheel, but slightly taller tire to stay around 25.7 inch rolling diameter. I guess the package could be narrower.....
Regards,
Jerry
Thats what I am thinking. Keeping it narrow, would be nice so you still have trunk space.
996 turbo spacesaver spare
Linear Mode
