Good question: Have a look at the lug bolt warning label photo in post #1 but keep in mind that the Mercedes SLK (R170) had different rims than the Crossfire.

 

it came with the lugs..i placed it in there... and was able to drop the top... and put it back up.. just didnt remove the bolts...

 

The seller sent these with the spare... they appear to be the longer /required for this spare... so i left them there...

 

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Some answers to the PM questions:

RE: The different lug bolt lengths:
Mercedes made two different types of space saver spares.
Some were steel wheels, and some were alloy wheels.
This wheel is alloy, so it uses our longer wheel lug bolts.
For the steel versions, you must switch to shorter lug bolts.

RE: Where to store the tire you remove:
This was definitely a concern. Here was my scenario:
I had a rubbery foam pad that goes on top of the roof.
Then the wheel with the flat tire gets set on top of the pad.
Then a nylon ratchet strap gets threaded through the wheel.
(under the wheel center, but over the tire on both sides).
Both passengers get in the car and then snug up the strap.
After that, the windows are not able to close all the way.
The pad and strap stowed in the hatch with the spare tire.

RE: My viewpoint:
I just can't stand being stranded on the side of the road.
AAA service has become abysmal, especially in rural areas..
There are MANY recent stories of people waiting for several hours.
I'm not good at handling that type of stress and lack of control.
This gave me back the ability to deal with the situation myself.
Luckily, I never needed to deploy it, but it was peace of mind.
.

 

not knowing which ones id need, i left them in the spare... from what ive seen...it looks like the longer ones that are stock on the xfire will work wiht this spare...

 

JBRDH, Just whenever you get the chance would you measure the length of the shaft on one of the bolts in your "temporary" spare wheel? (The shaft is BOTH the threaded & non-threaded section that is "straight", and located beneath the head & the flange)

BTW, OE Crossfire lug bolts are M12-1.50, 22.5mm Ball seat flange, 39.4mm shaft, 17mm hex head

 

just ran to the garage on this cold WI night... to get YOU a pic.. :-)

 

JBRDH, your fingers are touching the head of the bolt, the wide part below that is the Ball seat flange, and what I'd like to know is the length of THE REST of the bolt, the long, skinny STRAIGHT portion both threaded and unthreaded.

 

they are approx 40mm long... and this shows how far they stick through the wheel... these may be the oem CF bolts... the LR wheel on mine was replaced just prior to me taking posession... the original cracked wheel was given to me.. with the bolts... I think I just put these in this before trunking it...

 

Your memory serves you well. I concur with your findings. Thank you BTW, for going out of your way to check it out.

 

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This Mercedes spare uses the same lug bolts as the stock Crossfire wheels.
They both have the exact same thickness at the mounting flange.
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Catching up on the info here and added one of these to my "shopping list." As someone mentioned about AAA, which I don't have, but can say that the services insurance companies call can take a long time too. When my SKREEM went out, I was stuck 3-4 hours on a Friday night waiting.

Another question on these tires: since you inflate them when needed, what do you do after? Can it deflate back to the compact size, or it's a one shot fill?

 

The most ingenious location for a spare I ever had was on a 1989 Maserati Spyder that we got in '93 or '94 (with just 7k miles on it!) and sold in 2000 or 2001.

 

Whoever asked if this spare would assume original shape... that and basically all questions about this type of spare are answered here:

 

Wow, very cool. Thanks! :-)

 

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Cool video! BUT, this one being an 18" assembly, is the lug/rim size suitable for a crossfire hub/spindle N/A and/or SRT-6? Also, if you have one of these in any size that fits an XF, is it possible to get fingers into a place where they do not belong while inflating/deflating? Even if it doesn't fit a crossfire (which I would love to know), it is cool how it inflates/deflates! Finally, I see the guy in the video using what looks like a gas station (industrial) air hose, question is will the XF air compressor be strong enough to bypass the load that 'unfolding' to inflated pressure requires?


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So when I said "This video will answer ALL YOUR QUESTIONS about this type of tire" I can see I was wrong! There are videos out there showing the Mercedes-issued air pump completely inflating the tire. It takes about 11 minutes and is as exciting as watching paint dry!!! I never implied that the exact tire in that video was for use on the Crossfire, it simply was informative regarding this type of tire.

As for me, I'd like to go back to the days when replacing the full-size steel spare tire with one that matched the other 4 alloy ones was my only concern!

 

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The Mercedes space saver spare listed for sale in the original post of this thread fits on the front and back of standard Crossfires.
It gets installed using the stock Crossfire lug bolts, and will inflate with the stock Crossfire air pump that came with the car.
After usage, you simply remove the tire valve stem (tool included) and it deflates back down to its collapsed size for re-stowing.
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wassup fellas

 

Hello,
If you still have the spare tire for sale, please have the price with included shipping in Ohio (44077). Recently purchase 2005 Crossfire.
E-mail: fiorga@oh.rr.com

Thank you