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YOUR RESEARCHDIY roof rack system for track wheels
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Someone brake checked us on the freeway and the wheels didn't move at all.
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Suggestion · Original poster
Just drill 5/16 holes through the steel pipes and bolt the pipes to the yakima mounts using bolts, washers, and nuts.
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A few days ago I put together a roof rack system for track wheels. So far it has survived 500 miles of freeway and city driving with no problems. Thought I'd share my DIY.
Components:
Porsche Roof Transportation System
Yakima Universal Mighty Mounts
http://www.rei.com/product/722705?vcat=REI_SEARCH
2x 1 inch diameter 60 inches long galvanized steel pipes from Lowes (or your local home improvement store)
4x 5/16 2 inch galvanized hex bolts.
8x 5/16 galvanized washers
4x 5/16 galvanized nuts.
2x 10 ft tie downs.
The RTS's load capacity is 150 lbs. The Yakima universal mighty mounts' load capacity is 165 lbs. These mounts have holes that accept 5/16 bolts. Just drill 5/16 holes through the steel pipes and bolt the pipes to the yakima mounts using bolts, washers, and nuts. Then clamp the yakima mounts onto the RTS. I think this may be better than drilling holes through the RTS and mounting the pipes directly, since this is reversible.
It will be great to have a buddy help un-mount the rack, but it is not essential. Once I remove the wheels from the rack, it takes maybe 2 minutes to remove the rack from the roof.
Yes, the other two wheels are in the back. The passenger seat backs have these little handles for you to pull down the seat. On the drivers side you can "lock in" the wheel behind that little handle. Then put in the other wheel on the passenger side, and push the passenger seat back against it. Now both wheels are "locked in" nice and tight. Someone brake checked us on the freeway and the wheels didn't move at all.
One interesting thing I observed was how these two wheels on the roof affect the fuel economy. I used to get about 28 - 29mpg on that freeway. On my way down to the track I had the front wheels (225), and my mpg dropped to 22.4. On my way back I had the rear wheels (275), and my mpg dropped to 18.8. Next step may be to design some kind of areo thing to improve fuel economy?
I use that to lock in a case of beer!
Pretty dramatic mileage difference. I notice something similar whenever I put my yak rack on my audi. Probably would help to rig a bullet-nose-like fairing to the front, but unless you're driving a loooooooong way, likely wouldn't be worth the work.
That looks pretty good. If you reallly want to get some great looks from people on the highway, here is a link to the Willwood system. I use it for my bikes, which gets me alot of laughs driving down the road. Willwood makes a hitch to which you can attach a trailer mount.
Once you go down that road, the options are endless. Get rid of the beater pickup. Use your 996 for hauling mulch, plywood for DIY projests at home, etc. Nothing like 911 or Boxster being used as a tow vehicle!
http://www.willwoodsystem.com/
That system looks pretty good. Bought the roof transport system with the bike carrier. Thing wistles bad..... and I'm sure one dasy will drive into the garage with the bike on top
Mind on the other hand was once tapped in the rear end in my old car and had I had my bike on then it would have been tears then too.
Cheers all, happy biking and safe driving.
I'm waiting on mine from Will right now. I know it might seem blasphemy to some to want to put a bike on a Porsche, but I love mtn/road biking in the summer, and need to get my bike to the trail head.
The Porsche RTS for cab's just seemed, well, too bizarre and inconveniant to deal with.
- Nick
P.S. What kind of bumper does your car have? The black, removable bumperette's or body color variety? I have the body color versions, which
apparently isn't "standard" for Will's system, so he's working out something new..
Update - This thing even folds up for storage! That was not in my original design but it seems to be a nice unexpected benefit.
I did look into the trailer hitch, but there is just no room for a trailer at my house.
I do not have the body color painted bumperette's. I recall there was an issue with what bumperette's one had. He asked me to measure the distance between them. With the unpainted, black bumperettes the receivers are basically unnoticeable.
I bought my C4S used from an out of town dealer. After I finished negotiating the price, I asked the salesman to measure the distance between the bumperettes and call me back with the number. I'm sure at that point he thought I was a nut and wasting his time. I'm not even sure he believed me when I explained why. I ended up emailing him a link to the Willwood site.
