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post #1 of 20 Old Nov 16th, 2009, 7:24 am Thread Starter
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My homemade flex rig

I bought a California sidecar about a month ago and wanted to attache it to my R75/6. Well I finally got it attached as a flex sidecar and took it out for a ride. Boy, I don't even know I have it attached. The bike handles just like it wasn't there. The design also steers the S/C wheel in the direction of the bank. Now I have a real handling bike with with a sidecar. Here are some pictures before I put the cab on it.









Garry

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post #2 of 20 Old Nov 16th, 2009, 8:23 am
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Re: My homemade flex rig

Nice work Gary..............keep us posted.....................
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post #3 of 20 Old Nov 16th, 2009, 9:02 am
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Re: My homemade flex rig

Gary,
Awesome job. Very interested in seeing the finished rig. Just one question; I didn't understand the statement; "The design also steers the S/C wheel in the direction of the bank." Do you mean it leans with the bike or turns into the curve ? The photos don't seem to show that functionality?

Lynn Keen
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post #4 of 20 Old Nov 16th, 2009, 12:39 pm Thread Starter
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Re: My homemade flex rig

Quote:
Originally Posted by Lynn_Keen
Gary,
Awesome job. Very interested in seeing the finished rig. Just one question; I didn't understand the statement; "The design also steers the S/C wheel in the direction of the bank." Do you mean it leans with the bike or turns into the curve ? The photos don't seem to show that functionality?
As the bike leans the front pivot arm moves more relitive to the rear pivot arm thereby turning the sidecar wheel in the direction of the bank. The key is having the front pivot higher than the rear pivot. Mine is about 4" and then at a 40 degree bank it will pivot the S/C wheel about 8 degrees.

It works great, I don't even feel the S/C frame on the bike.

Garry

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post #5 of 20 Old Nov 16th, 2009, 1:14 pm
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Re: My homemade flex rig

Quote:
Originally Posted by garry_kramer
As the bike leans the front pivot arm moves more relitive to the rear pivot arm thereby turning the sidecar wheel in the direction of the bank. The key is having the front pivot higher than the rear pivot. Mine is about 4" and then at a 40 degree bank it will pivot the S/C wheel about 8 degrees.

It works great, I don't even feel the S/C frame on the bike.

Garry
Interesting geometry. Wish you lived a little closer, I'd love to have a look at the rig.

Lynn Keen
North East Florida
MSF #28271 Retired
'99 Canyon Red RETIRED AT 93,000 MI
'05 GRAPHITE METALLIC retired at 87,000 MI
'01 R1150 GS- totaled
'02 R1150 GS sold
'85 K100/EML sidecar sold
'11 R1200RT currently being enjoyed

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post #6 of 20 Old Nov 16th, 2009, 7:13 pm
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Re: My homemade flex rig

Very clever and innovative and very interesting
although you won't be able to "fly" the sidecar
which is "half the fun" of owning one,

Is there enough room to change the oil filter
or does the "bracket" have to be removed.


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post #7 of 20 Old Nov 17th, 2009, 6:14 am Thread Starter
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Re: My homemade flex rig

Quote:
Originally Posted by SilverBuffalo
Very clever and innovative and very interesting
although you won't be able to "fly" the sidecar
which is "half the fun" of owning one,

Is there enough room to change the oil filter
or does the "bracket" have to be removed.
I'll be machining out the area when I do the teardown for painting. There will still be plenty of room to get it out.

Garry

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post #8 of 20 Old Nov 17th, 2009, 1:51 pm
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Re: My homemade flex rig

Wow, I have to reveal my ignorance and admit that this is the first time I see something like this!

I have always considered sidecars (and trikes for that matter) as thing that are "not on my street" so to speak. The flex idea is brilliant!

Whether it was your invention or somebody else's it does not matter. This gives a totally different approach to to sidecars, at least in my mind.

Thank you for sharing the info and keep us updated on your progress.

Regards

Ari "the Farkle-Freak-Finn" Ignatius

Hyvinkää, Finland
2004 ('05) LT, Dark Graphite, "Sunset Cruiser II"

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post #9 of 20 Old Nov 17th, 2009, 2:54 pm
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Unhappy Re: My homemade flex rig

Whoa!! I don't mean to rain on your parade my friend, but with all due respect, and while I find your enthusiasm admirable, I wouldn't ride in it. There's a reason that factory made side-cars do not have this "flex" joint..and the reason is stress. That's one heck of a moment you have hangin off of your bike now, and I'd be VERY wary of bending your bike's frame, and/or over-stressing and cracking the main flex joint attachment points. Be careful man...

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post #10 of 20 Old Nov 17th, 2009, 5:26 pm
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Re: My homemade flex rig

Quote:
Originally Posted by Toolman
Whoa!! I don't mean to rain on your parade my friend, but with all due respect, and while I find your enthusiasm admirable, I wouldn't ride in it. There's a reason that factory made side-cars do not have this "flex" joint..and the reason is stress. That's one heck of a moment you have hangin off of your bike now, and I'd be VERY wary of bending your bike's frame, and/or over-stressing and cracking the main flex joint attachment points. Be careful man...
Hmmm, I don't get it. Doesn't it just pivot? Can't see where the stress would be...

To me it seems like this design would have less stress than a typical sidecar rig.

There must be something I can't see (or 'figger out) in the pix.

This design would be perfect for my Vergasser R11/1 so I could take a friend for a ride.
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Last edited by RonKMiller; Nov 17th, 2009 at 5:37 pm.
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post #11 of 20 Old Nov 17th, 2009, 5:48 pm
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Re: My homemade flex rig

Quote:
Originally Posted by pozo_izquierdo
Whether it was your invention or somebody else's it does not matter. This gives a totally different approach to to sidecars, at least in my mind.
The "idea" has been around for almost a hundred years now,
it just never really "took off"
Flexit has been around for a while and I remember seeing early 1900's leaning sidecars,
Gamount was one FLXIBLE another

But what's so cool about Gary's design is that he built it himself,
I wouldn't be surprised if he has some Finnish ancestry in his family.

Oh, the toolman is right, sidecars are known for eating tires and braking frames (rigid mounted frames that is)


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post #12 of 20 Old Nov 17th, 2009, 8:34 pm Thread Starter
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Re: My homemade flex rig

Quote:
Originally Posted by SilverBuffalo
The "idea" has been around for almost a hundred years now,
it just never really "took off"
Flexit has been around for a while and I remember seeing early 1900's leaning sidecars,
Gamount was one FLXIBLE another

But what's so cool about Gary's design is that he built it himself,
I wouldn't be surprised if he has some Finnish ancestry in his family.

Oh, the toolman is right, sidecars are known for eating tires and braking frames (rigid mounted frames that is)
I must admit it wasn't my design. I got the idea here:

http://www.kalich.de/index.html

With the limited pictures I was able to deduce how it worked and designed it for myself.
The main mount is 3/16" plate bolted on each side of the engine mount frame. The struts are 1-1/2" DOM tubing with .250" wall. The attachment tube is 1-3/4" DOM with .125 wall. All attachments are grade 8 bolts. The swivel eyes are 5/8". The main tube is 1-1/2"x.25wall DOM with 2 - 2"x1/4" angle iron mounts welded on. The swivel eye attachment front is 3/8"x2" CRS with gusset and re-enforcement at the eye bolt and the back is 1-1/2" dia CRS press fit into the DOM and welded. The 4 grade 8 bolts holding the angle on, each have a breaking strength of 24,000 lbs. (96,000 lbs total) The engine mount bolts from BMW are high strength also.

Anything else you want to know?

Garry

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Last edited by garry_kramer; Nov 17th, 2009 at 9:01 pm.
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post #13 of 20 Old Nov 18th, 2009, 3:52 am
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Re: My homemade flex rig

Quote:
Originally Posted by garry_kramer
I must admit it wasn't my design. I got the idea here:

http://www.kalich.de/index.html

With the limited pictures I was able to deduce how it worked and designed it for myself.
The main mount is 3/16" plate bolted on each side of the engine mount frame. The struts are 1-1/2" DOM tubing with .250" wall. The attachment tube is 1-3/4" DOM with .125 wall. All attachments are grade 8 bolts. The swivel eyes are 5/8". The main tube is 1-1/2"x.25wall DOM with 2 - 2"x1/4" angle iron mounts welded on. The swivel eye attachment front is 3/8"x2" CRS with gusset and re-enforcement at the eye bolt and the back is 1-1/2" dia CRS press fit into the DOM and welded. The 4 grade 8 bolts holding the angle on, each have a breaking strength of 24,000 lbs. (96,000 lbs total) The engine mount bolts from BMW are high strength also.

Anything else you want to know?

Garry
Yeah - how come you didn't use stronger bolts?

That is WAY cool - I really admire your fabricating talents - and at roughly $10,000 for the German unit you're already probably $9,500 ahead of the curve. (pun intended)

That's one lucky dog in the second picture, and a couple of REALLY lucky kids in the last.
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Last edited by RonKMiller; Nov 18th, 2009 at 4:29 am.
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post #14 of 20 Old Nov 18th, 2009, 7:40 am
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Re: My homemade flex rig

Quote:
Originally Posted by garry_kramer
Anything else you want to know?
ummm nope, that about covers it

It would be pretty cool if you could work this into your avatar or signature
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post #15 of 20 Old Nov 18th, 2009, 7:47 am Thread Starter
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Re: My homemade flex rig

Quote:
Originally Posted by SilverBuffalo
ummm nope, that about covers it

It would be pretty cool if you could work this into your avatar or signature
Need to make the avitar with a black airhead.....

Garry

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post #16 of 20 Old Nov 22nd, 2009, 7:57 am Thread Starter
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Smile Re: My homemade flex rig VIDEO back view

Here is a rear view of my homemade leaner sidecar. With the bags on I can lean 22.5 degrees to the right. I have since removed the bags and now have great lean angle both left & right. I had it up to 70mph and had no problem with it.

http://www.youtube.com/watch?v=tx66skXRxx8

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post #17 of 20 Old Nov 22nd, 2009, 9:37 am
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Thumbs up Re: My homemade flex rig VIDEO back view

Quote:
Originally Posted by garry_kramer
Here is a rear view of my homemade leaner sidecar. With the bags on I can lean 22.5 degrees to the right. I have since removed the bags and now have great lean angle both left & right. I had it up to 70mph and had no problem with it.

http://www.youtube.com/watch?v=tx66skXRxx8

Garry
Gary,
Wow.. looks super.. I actually wonder why most sidecar's lack this flexible linkage.. It seems very natural in action and that is quite appealing !!! Congratulations on a great new addition to your toy box !!!

Bill
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post #18 of 20 Old Nov 22nd, 2009, 4:56 pm Thread Starter
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Re: My homemade flex rig

Here is s front view

http://www.youtube.com/watch?v=pv0E5A4YhdA

Garry

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post #19 of 20 Old Jan 8th, 2010, 9:07 pm Thread Starter
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Re: My homemade flex rig

Got it painted and now putting it back together








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post #20 of 20 Old Jan 9th, 2010, 9:35 am
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Re: My homemade flex rig

Gary;

Nice work.........very nice.................looks like you'll have a ball with that rig........
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