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      08-24-2010, 07:48 PM   #1
jeremydgreat
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Tire Carrying Roof Rack (With pics. Concept, not Step-by-step)

This will make for a very lame, very brief DIY article, but here it is anyway:

The Home Depot MacGyver Tire Holding Roof Rackô*

* It probably holds other stuff well too, like surf boards and kayaks.
  • It never touches your paint.
  • It easily holds the load of four wheels/tires
  • It looks pretty nice (not made of wood or chain link fence or something)
  • It is solid. If you try to push the tires when their mounted, the car will move. The cross beams of the rack sit behind and in front of the BMW base rack beam, rather than on top. In this way, the bars push against each other for support when you're under heavy braking or accelerating.

Cost:
Thule makes a rack similar to this that is large enough to hold all the tires. It's like $480 or something ridiculous. Yakima makes one too, and though it's less expensive, it's a bit too small for 4 18" wheels and still costs like $350ish. The Home Depot MacGyver Tire Holding Roof Rackô will cost you about $70-$80, which includes the tools and the straps that hold down the tires.

Items to purchase:
  • 4x 1" thick electrical piping (10ft in the electrical section)
  • 1x cross bracket (right by the pipes in the electrical section)
  • Bracket/clamp thingy to connect the two items above
  • Duct tape (to tape up the ends)
  • Copper pipe insulation
  • A hack saw and some serious blades
  • Cinch downs. I bought 8. One to cinch down each tire in the center of the tire. And 4 to make a big "X" across the top of all the tires.
  • 4x smaller, thinner cinch downs to tie the rack to the BMW rack.
  • Zip ties.
  • Little teeny bungie cords. You'll use these to strap down the excess from the large cinch downs.
  • The BMW Roof Rack base system

Pics: (whole set here)











Closeup Pics:









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      08-24-2010, 08:12 PM   #2
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wow good idea! and possibly(hopefully) below the maximum weight limit as well.
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      08-24-2010, 08:13 PM   #3
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Are you sure you are not exceeding the recommended load for the roof?
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      08-24-2010, 09:49 PM   #4
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Quote:
Originally Posted by spfdenhugh View Post
Are you sure you are not exceeding the recommended load for the roof?
Each wheel/tire set weighs around 30-35lbs. So at max we'd be talking 140lbs. The rack I've build weight maybe 30lbs, so it would be a total of 170(ish)lbs.

I'm not sure what the BMW base rack's weight limit it, I'll look. You'd think it would be over 170lbs though, right?
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      08-24-2010, 09:58 PM   #5
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its 150lbs max but the way you have it will spread the weight out pretty evenly so I don't think you'll have any problems.
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      08-24-2010, 10:13 PM   #6
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Quote:
Originally Posted by UdubBadger View Post
its 150lbs max but the way you have it will spread the weight out pretty evenly so I don't think you'll have any problems.
Ah okay. Maybe I'll put one tire in the trunk next time, if I have the room. Still, I was pretty happy with how it turned out.
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      08-24-2010, 10:42 PM   #7
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Quote:
Originally Posted by jeremydgreat View Post
Ah okay. Maybe I'll put one tire in the trunk next time, if I have the room. Still, I was pretty happy with how it turned out.
yeah I'm sure you'd be ok. I think you'll be fine with it the way it is anyway. The load isn't centralized in any one spot so its not like its putting pressure on one specific area.
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      08-25-2010, 01:10 AM   #8
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Now thats genius!
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      08-25-2010, 07:12 AM   #9
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I was thinking of doing this, but I have a trailer already.

I like it. Very Mad Max.
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      08-25-2010, 09:35 AM   #10
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I like it. Very Mad Max.
exactly what I thought.
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      08-26-2010, 01:48 PM   #11
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That totally looks like it might even improve your gas mileage too.

I used to load my Mini Cooper S onto my Trailblazers roof rack all the time, it was fine.


OK seriously now, That is a lot of weight to add to the top of the car. You can make the car very unstable. I would suggest the track day trailer option instead.

Also how did you get 35lbs/tire??? I've never seen a wheel lighter than ~18lb (for 18") and a tire less than 21lb (for a 135i racing size >245) Thats 49lb/corner at ~160lbs +rack. You are probably close to 200lbs and that is dangerous.

I don't want to be a jerk, but it is probably worth the extra money to protect your safety and the car from damage.
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      08-26-2010, 01:53 PM   #12
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well the weight may be to much I think thats an outstanding build. Dont go crazy on the way to the track and I am sure you'll be AOK. haha I dont recommend you throw the stocks on the roof for tracking
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      08-27-2010, 12:53 AM   #13
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very nice ...
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      08-27-2010, 01:22 AM   #14
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Quote:
Originally Posted by tgxmike View Post
That totally looks like it might even improve your gas mileage too.

I used to load my Mini Cooper S onto my Trailblazers roof rack all the time, it was fine.


OK seriously now, That is a lot of weight to add to the top of the car. You can make the car very unstable. I would suggest the track day trailer option instead.

Also how did you get 35lbs/tire??? I've never seen a wheel lighter than ~18lb (for 18") and a tire less than 21lb (for a 135i racing size >245) Thats 49lb/corner at ~160lbs +rack. You are probably close to 200lbs and that is dangerous.

I don't want to be a jerk, but it is probably worth the extra money to protect your safety and the car from damage.
Quit ruining everyones fun
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      08-27-2010, 04:35 AM   #15
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Quote:
Originally Posted by tgxmike View Post
That totally looks like it might even improve your gas mileage too.

I used to load my Mini Cooper S onto my Trailblazers roof rack all the time, it was fine.


OK seriously now, That is a lot of weight to add to the top of the car. You can make the car very unstable. I would suggest the track day trailer option instead.

Also how did you get 35lbs/tire??? I've never seen a wheel lighter than ~18lb (for 18") and a tire less than 21lb (for a 135i racing size >245) Thats 49lb/corner at ~160lbs +rack. You are probably close to 200lbs and that is dangerous.

I don't want to be a jerk, but it is probably worth the extra money to protect your safety and the car from damage.
Even if it was 180-200lbs, the base rack is rated at 150lbs. I think you might be overstating the danger there. I also think it depends on "what" the weight is- I'd feel less comfortable about mounting a 200lb canoe on the top of the car. With the tires, the weight is low, distributed evenly, and everything is cinched very tight.

To each his own I suppose.
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Last edited by jeremydgreat; 08-27-2010 at 04:41 AM.
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      08-27-2010, 07:15 AM   #16
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It is a great idea, but I still wouldn't put the 4th tire just for safety. When you are going over a curb, highway bridge joint or anything in that matter will create extra stress on the mount points.

I am pretty sure BMW rated 150 lbs and there probably is another 50 lbs of safety net but you are over what's recommended and very close to the limit.

Enjoy your rack, it is an awesome idea, and ton of space saver. just get one tire in to be perfectly safe.
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      08-27-2010, 11:49 AM   #17
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Quote:
Originally Posted by Evice View Post
It is a great idea, but I still wouldn't put the 4th tire just for safety. When you are going over a curb, highway bridge joint or anything in that matter will create extra stress on the mount points.

I am pretty sure BMW rated 150 lbs and there probably is another 50 lbs of safety net but you are over what's recommended and very close to the limit.

Enjoy your rack, it is an awesome idea, and ton of space saver. just get one tire in to be perfectly safe.
Yeah. I think if there's room in the back seats or trunk, one of the tires is going in there next time. Might as well.
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      09-04-2010, 04:06 PM   #18
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hmmm wonder if this could be done for a 1 time thing with bike racks instead of those padded bars.
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