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F10 / F11 (2011 - Current)
The new chapter in the highly successful story of the BMW 5 Series Sedan (F10) and wagon (F11)

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  #1  
Old 07-08-2012, 03:18 PM
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F10 tandem bicycle rack

Since our household is now truckless and SUVless it has become necessary for yours truly to become a bit creative in how to carry our tandem. So I bought a extra bike rail for the BMW roof rack, cut one to size, and connected them end to end. I ended up with three load bearing points: fork mount, front bottom bracket (with a rubber spacer), and the rear wheel. The trunk can opened with rack on the car, but it can't be opened with the tandem on the roof. The rack is still usable for both a single bikes by adjusting the rear wheel holder on the tandem side.

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  #2  
Old 07-08-2012, 06:21 PM
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Needsdecaf Needsdecaf is offline
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Clever you.

On another note...do you actually enjoy riding one of those? I always thought I would find it highly annoying.

On a third note, where the hell do you ride a road bike around here without taking your life in your hands?
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  #3  
Old 07-08-2012, 07:26 PM
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Clever you.
Thanks!

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Originally Posted by Needsdecaf View Post
On another note...do you actually enjoy riding one of those? I always thought I would find it highly annoying.
We have fun with it when we are both in shape, unfortunately Mrs. D is in better shape right now. We tend to use it for organized rides, especially at tandem rallies. Our singles are used in most everyday riding situations. I bought a new titanium road bike a few of weeks ago and I've ridden it almost everyday since, but this tandem project was a bit overdue.

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On a third note, where the hell do you ride a road bike around here without taking your life in your hands?
Well actually Mrs Dunderhi is putting her life in my hands, but she's used to me saying "hold-on" in the car too. Actually, we tend to ride in country settings, so traffic isn't much of a problem.
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  #4  
Old 07-09-2012, 05:46 AM
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LOL.....ingenious really.....A 500hp tandem bicycle hauler. I dig it! You do realize you actually installed something on your car that wasn’t a "go fast" part…..
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  #5  
Old 07-09-2012, 06:10 AM
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LOL.....ingenious really.....A 500hp tandem bicycle hauler. I dig it! You do realize you actually installed something on your car that wasn’t a "go fast" part…..
Unless you're talking about the bike. I bet that thing has never been 0-60 faster.
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  #6  
Old 07-09-2012, 09:06 AM
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You do realize you actually installed something on your car that wasn’t a "go fast" part…..
The tandem is "go fast" all right, we've had going over 60mph... downhill. At speeds over 45, Mrs D just closes her eyes.

Unfortunately, Mrs D asked "what if we want to take the singles and the tandem to a rally?" Adding a third rail is going to make crowded up there. Maybe, it's time to start using her car for bike duty.
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  #7  
Old 07-09-2012, 09:14 AM
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Nice setup. Need some disc brakes for those 60 mph downhills tho.
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  #8  
Old 07-09-2012, 10:31 AM
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Nice setup. Need some disc brakes for those 60 mph downhills tho.
Disc brakes? This tandem was built for speed, not stopping! Anyway, I'm pretty happy with the performance of the Dura-Ace calipers thus far.

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  #9  
Old 07-09-2012, 01:50 PM
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We had a tandem, big problem is heat dissipation on long steep down hills. Twice the weight half the brakes. If you get enough road rash you will understand.
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  #10  
Old 07-09-2012, 02:45 PM
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We've had this tandem since 2003 without any issues, but I'm old track racer, so brakes have always been optional for me.
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  #11  
Old 07-09-2012, 03:50 PM
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Dunder, probably a silly question but..., can the tandem rail be moved 8"-12" farther forward to get the center mass of the bike closer to the center distance between the load bars? This might even make enough room so that the trunk can open even with the bike in place. Haven't looked at this stuff for years since giving up the bike and the iron horse. Only miss the iron horse - in the country, not in town.
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  #12  
Old 07-09-2012, 04:25 PM
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Hey it's your call. Our worst experience on a tandem was when the front braze on canteiliver brake broke off and we went through a red light at about 30mph . Been doing this a long time though. Here is a pic of my first Euro bike delivery in 1984. What track do you ride? We rode at the old Encino Velodrome.
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  #13  
Old 07-09-2012, 04:42 PM
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Quote:
Originally Posted by MSgtMel View Post
Dunder, probably a silly question but..., can the tandem rail be moved 8"-12" farther forward to get the center mass of the bike closer to the center distance between the load bars? This might even make enough room so that the trunk can open even with the bike in place. Haven't looked at this stuff for years since giving up the bike and the iron horse. Only miss the iron horse - in the country, not in town.
The BMW rack lock is in a fixed position, but most of the weight is at the front bottom bracket which is centered between the rails. There's virtually no weight at the rear wheel.
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  #14  
Old 07-09-2012, 05:00 PM
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Thanks for the edu. Shame the lock is fixed as being able to shift the rails would easily allow three bikes on the roof.
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  #15  
Old 07-09-2012, 06:23 PM
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Hey it's your call. Our worst experience on a tandem was when the front braze on canteiliver brake broke off and we went through a red light at about 30mph . Been doing this a long time though. Here is a pic of my first Euro bike delivery in 1984. What track do you ride? We rode at the old Encino Velodrome.

That's another reason not to like cantilever brakes, but I'm not a fan of disc brakes either. I customed ordered the tandem to have standard calipers. Since I'm 70% of our tandem team weight, I don't think of it as being much different than my single bike. We've had some close calls ourselves, but it basically came down to manuevering skills over braking power.

I never thought to do a bike ED, but my first two bikes were French, but once I started racing for real, Schwinns were the team bikes. Trexlertown, PA was my home track, but I also raced at Kissena,NY; Kenosha, WI; Hampton, VA; and Los Angeles all back in the 80s.
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  #16  
Old 07-09-2012, 06:26 PM
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Thanks for the edu. Shame the lock is fixed as being able to shift the rails would easily allow three bikes on the roof.
I think I could put a third rail in the center and put a bike in between. There would also be the option the reverse the third bike to have it facing backwards.
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  #17  
Old 05-27-2013, 06:43 AM
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Quote:
Originally Posted by dunderhi View Post
Since our household is now truckless and SUVless it has become necessary for yours truly to become a bit creative in how to carry our tandem. So I bought a extra bike rail for the BMW roof rack, cut one to size, and connected them end to end. I ended up with three load bearing points: fork mount, front bottom bracket (with a rubber spacer), and the rear wheel. The trunk can opened with rack on the car, but it can't be opened with the tandem on the roof. The rack is still usable for both a single bikes by adjusting the rear wheel holder on the tandem side.

Attachment 332148Attachment 332149Attachment 332150
Hi,
Great job on the rack. Very creative. We just bought a Co-Motion tandem and I have a base carrier on my F10. Could you please share more details on how did you do the custom carrier? Thanks
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  #18  
Old 05-27-2013, 02:41 PM
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Congrats on the Co-Motion!

I used two single rails and removed the head unit from the front of the rail (for the rail in the back) and the cut the back end of the other rail (for the rail in the front) right where the bottom bracket would be placed I then used the existing base-piece and a metal connector strip to firm-up the joint. When I install the tandem, I place a rubber pad between the joint and the front bottom bracket to create a downforce. The weight of the tandem rests on the joint (which is in-between the two cross bars) while the front and back connections act as stabilizers. This setup has been tested at high speeds and works pretty well.

The trunk can be opened fully with the rack the roof, but the addition of the tandem means the trunk will not open fully due to the tire sitting a bit more rearward.

Now that I have the 6er and the X5, I don't really need this set-up anymore. I'm planning to put the cross bars and two single bike rails up for sale for $200 and the tandem rail for $75 (due to the small dent in the front rail).

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I need to get around to selling the extra wheels (BBS RGR & Rial) and spare from my 335d too, so I'm letting you guys know about it first.
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Old 05-27-2013, 04:55 PM
myBMW535 myBMW535 is offline
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Quote:
Originally Posted by dunderhi View Post
Congrats on the Co-Motion!

I used two single rails and removed the head unit from the front of the rail (for the rail in the back) and the cut the back end of the other rail (for the rail in the front) right where the bottom bracket would be placed I then used the existing base-piece and a metal connector strip to firm-up the joint. When I install the tandem, I place a rubber pad between the joint and the front bottom bracket to create a downforce. The weight of the tandem rests on the joint (which is in-between the two cross bars) while the front and back connections act as stabilizers. This setup has been tested at high speeds and works pretty well.

The trunk can be opened fully with the rack the roof, but the addition of the tandem means the trunk will not open fully due to the tire sitting a bit more rearward.

Now that I have the 6er and the X5, I don't really need this set-up anymore. I'm planning to put the cross bars and two single bike rails up for sale for $200 and the tandem rail for $75 (due to the small dent in the front rail).

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I need to get around to selling the extra wheels (BBS RGR & Rial) and spare from my 335d too, so I'm letting you guys know about it first.
Thank you for the detailed explanation. I would be definitely interested to purchase the tandem rail. Please let me know what is the best way for us to connect. Thanks
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Old 05-27-2013, 04:57 PM
myBMW535 myBMW535 is offline
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Smile

Thank you for detailed explanation. I would definitely be interested in purchasing the tandem rail. Please let me know what is the best way for us to connect.
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  #21  
Old 05-27-2013, 06:04 PM
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Thank you for detailed explanation. I would definitely be interested in purchasing the tandem rail. Please let me know what is the best way for us to connect.
PM sent.
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