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X1 F48 (2016 - current)
Second generation F48 BMW X1 builds on the success of it's predecessor. Increases in power, interior and cargo space keep it a leader in the small SUV field.

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  #1  
Old 10-02-2019, 08:12 AM
gkski gkski is offline
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Help Finding the M8 Nut under Cargo Cavity

Those of you with the space saver spare bolted down under your cargo floor, either the OEM configuration or your aftermarket arrangement, how about saving some of us some grief and measuring the location of the M8 nut hidden under the floor?

Maybe if you measure at a right angle from the sides and front/back of the cargo cavity, some of us will be able to find it with a magnet or probe and save cutting the floor material in error.

Thanks in advance.
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  #2  
Old 10-02-2019, 12:14 PM
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motordavid motordavid is offline
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Not certain I understand the question or your goal, or what/why...

Attached, are some quick pics I took of my CEO's '17 X1 spare tire well.

I was bored so I pulled stuff out, checked the temp spare tire psi, measured from Edges of carpeted well to center of the threaded bolt hole.

Hope this helps. If not, maybe rephrase your wonderment.
GL, mD

Measurements from edge of carpeted squareish tire well edges to ~ center of hold down bolt hole:

From back on car leaning in...

-back to ctr: 13.5"

-driver side to ctr: 14 3/4ths "

-pass side to ctr: 13 1/4 " fat

-interior side to ctr: 12 1/2" from rear seat side inward
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'01 X5 3.0 Sport, 5 Spd Manual, etc.
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  #3  
Old 10-02-2019, 12:19 PM
gkski gkski is offline
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Thanks, Motor.

I do think your efforts will be a help. I should be able to position my spare as your photos show, chalk the center spot and confirm with your measurements. Then tapping or using a magnet I should be able to find the bolt receptor and just cut out enough material to reveal it.
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Old 10-02-2019, 12:22 PM
gkski gkski is offline
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Fwiw, I am thinking of using this M8, star grip fastener (available in varying thread lengths) to hold the tire down once I reveal the bolt receptor.

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Old 10-02-2019, 12:30 PM
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Welcome...
I guess you assume there is a threaded female bolt receptacle under your well mat, as in they put it there when building, whether one has temp spare or not...

My temp spare also has a styrofoam carrier with a couple of 'parts' that fits in over temp spare wheel, and a slotted plastic cover 'hat' that goes over that styro carrier and lays flat on spare.

The wing nut bolt goes into the slot and just reaches the threaded bolt hole, and I tighten it down.

If you need pics of those parts, let me know.
GL, mD
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'01 X5 3.0 Sport, 5 Spd Manual, etc.
'02 VetteVert 6 Spd, Z51 susp.
'17 X1 F48 for the CEO, & 3 Assorted M'Cycles.
BMW CCA mem. Tarheel Chapter
My Flickr...Scenes,Cars & Road Trip Pics:
http://www.flickr.com/photos/[email protected]/
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Old 10-02-2019, 01:36 PM
gkski gkski is offline
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Thanks, again Motor.

Yes, I have been told the female bolt receptor is under the flooring material regardless of tires equipping the vehicle.

I''m aware of the additional parts, spacers and styrofoam in your configuration. For me, I want to lay the tire with its inside facing up so that I can store items inside it. This will mean I will want to get just the right size star grip fastener and probably just thread it through a disk on top of the wheel opening thereby securing the wheel.
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Old 10-02-2019, 03:56 PM
gkski gkski is offline
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Driver's side to center looks a little odd, but I think your photos will be the most helpful.
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Old 10-02-2019, 06:49 PM
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That back well floor(ing) material is not exactly custom wool carpeting.
It is thin, should be easy to cut into, and if you get in the center of your car's well floor per the measurements, you should be close and the hold should be easy to locate.

I measured from upper inside edge of the squarish well to center of female threaded bore, and measured twice, so for my well those measurements should be with an 1/8th or better.

GL with your project.
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'01 X5 3.0 Sport, 5 Spd Manual, etc.
'02 VetteVert 6 Spd, Z51 susp.
'17 X1 F48 for the CEO, & 3 Assorted M'Cycles.
BMW CCA mem. Tarheel Chapter
My Flickr...Scenes,Cars & Road Trip Pics:
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  #9  
Old 10-07-2019, 05:34 PM
gkski gkski is offline
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I was able to reveal the screw receptor without a lot of difficulty.

Now my issue is that kind of screw is required. I thought the BMW thumbscrew was 8M, but I tried an 8M bolt and some 8M taps I had and although I believe 8M is most likely correct, I guess I am off on the pitch.

Hope someone out there has the specs?
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Old 10-07-2019, 07:53 PM
Markst Markst is offline
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It should be a 68mm long M8 screw, normal pitch.
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Old 10-07-2019, 08:02 PM
gkski gkski is offline
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Quote:
Originally Posted by Markst View Post
It should be a 68mm long M8 screw, normal pitch.
Yes but what is "normal pitch", 1.25 coarse or 1.0 fine? The latter did not work in my case.

Anyone got a thread gauge or trained eye?
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Old 10-07-2019, 08:31 PM
Markst Markst is offline
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I guess it is 1.25, when they're fine thread it usually mentioned on the parts catalog.
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Old 10-08-2019, 06:50 AM
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Maybe hit the local BMW dlr and see if they have/can ID from RealOEM or can order the oe hold down plastic cover and wingnut bolt?
My CEO has our X1 most of the day, so not able to eyeball our bolt/try to size it.
GL, mD
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'01 X5 3.0 Sport, 5 Spd Manual, etc.
'02 VetteVert 6 Spd, Z51 susp.
'17 X1 F48 for the CEO, & 3 Assorted M'Cycles.
BMW CCA mem. Tarheel Chapter
My Flickr...Scenes,Cars & Road Trip Pics:
http://www.flickr.com/photos/[email protected]/
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  #14  
Old 10-09-2019, 06:21 AM
gkski gkski is offline
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Went back and got a M8 bolt with coarse (1.25) thread and it threaded right into the receptor under the floor.

So, confirming that it is M8 1.25.
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