ADVrider

Go Back   ADVrider > Bikes > GSpot > GS Boxers
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-24-2012, 12:27 PM   #1
ausfahrt OP
mach schnell
 
ausfahrt's Avatar
 
Joined: Apr 2008
Location: Fl & Vt
Oddometer: 1,678
Trailering

I bought a Pitbull trailer restraint a couple of years ago for my '07 GSA. I love it and it performs flawlessly. For those of you not familiar with the Pitbull system, it does not require any straps or tie downs at all. It does not compress the suspension and allows the bike to "float" on the trailer.

My concern is regarding the swingarm pivot bearing. The swingarm assembly was not designed for the torsional loads that this puts on it. I have not had any problems and I just returned from a family Thanksgiving reunion that got me out of the sandbox for a few days.

Any thoughts or suggestions would be appreciated, here are a few pics of my rig:





__________________
******

You can always count on the Americans to do the right thing, after they have tried everything else.
-Winston Churchill

ausfahrt screwed with this post 11-24-2012 at 12:39 PM
ausfahrt is offline   Reply With Quote
Old 11-24-2012, 12:36 PM   #2
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,180
I wouldn't use the rear stand. Like you said, the bike isn't designed for that kind of loading. As the suspension moves the rear stand will stress the FD and suspension, and the side loads will definitely stress the FD and pivot bearings.

Use the front stand and tie it down with straps to the telelever tightly. Then strap it down to the rear frame snug, but not tight, to keep the rear from moving around.

Jim
JimVonBaden is online now   Reply With Quote
Old 11-24-2012, 02:05 PM   #3
def
I've little to say
 
def's Avatar
 
Joined: Feb 2004
Location: The woods and mountains of Alabama
Oddometer: 8,449
Whenever trailering the GS, I have always used straps attached as high on the bike as sensible to reduce strap loads as well as increased security and minimize load to the bike at attachment points.

At the front, I roll the bike into a wheel chock and use ratchet straps at the fork brace oriented so that the straps are pulling the bike forward slightly into the chock.

At the rear, I secure straps to the passenger peg mounts with only moderate compression of the rear suspension. Finally, I place a chock at the rear of the rear tire.

I have trailered my GS thousands of miles in this manner without incident. Also, I put a cover on the bike and use bungees to secure the cover.
def is online now   Reply With Quote
Old 11-24-2012, 02:16 PM   #4
Chris41483
Adventurer
 
Joined: Sep 2011
Location: Alabama
Oddometer: 16
I like it! That looks like a great tool. As a rule of thumb always ask yourself, "does this stress anything more than me riding it?" i don't think so. Looks really well done
Chris41483 is offline   Reply With Quote
Old 11-24-2012, 02:28 PM   #5
sieg
Beastly Adventurer
 
sieg's Avatar
 
Joined: Jul 2008
Location: Southern Illinois USA
Oddometer: 2,348
See above. He's right!
__________________
I'm not saying there should be capital punishment for stupidity, but let's take the safety labels off of everything and let the problem solve itself.
Current bikes F800GS-EXCF350-Versys-690R-RZ350
sieg is offline   Reply With Quote
Old 11-24-2012, 04:08 PM   #6
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,180
Quote:
Originally Posted by Chris41483 View Post
I like it! That looks like a great tool. As a rule of thumb always ask yourself, "does this stress anything more than me riding it?" i don't think so. Looks really well done
So you think that the FD incurs lateral stresses as it would on the stand as shown when riding?

Jim
JimVonBaden is online now   Reply With Quote
Old 11-24-2012, 04:18 PM   #7
Chris41483
Adventurer
 
Joined: Sep 2011
Location: Alabama
Oddometer: 16
Quote:
Originally Posted by JimVonBaden View Post
So you think that the FD incurs lateral stresses as it would on the stand as shown when riding?

Jim
Most definitely. When you lean the bike, the same forces are in effect. Think of the whole system; when we lean the bike while riding, the bike itself may be moving as one unit, however the link between the road and tire is effectively the same as the link he is using. In actuality, the only thing he has done with this stand is take the tire out of the equation.

I went to the website to see if I could obtain one for my drz: they do, but they are $279. Wow! I'll stick with the ratchet straps!
Chris41483 is offline   Reply With Quote
Old 11-24-2012, 04:23 PM   #8
roadtrip22
Gnarly Adventurer
 
roadtrip22's Avatar
 
Joined: Jan 2011
Location: Apex, NC
Oddometer: 334
Is that bike stolen or broken?? I wasn't aware trailering these bike was allowed
roadtrip22 is offline   Reply With Quote
Old 11-24-2012, 04:24 PM   #9
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,180
Quote:
Originally Posted by Chris41483 View Post
Most definitely. When you lean the bike, the same forces are in effect. Think of the whole system; when we lean the bike while riding, the bike itself may be moving as one unit, however the link between the road and tire is effectively the same as the link he is using. In actuality, the only thing he has done with this stand is take the tire out of the equation.

I went to the website to see if I could obtain one for my drz: they do, but they are $279. Wow! I'll stick with the ratchet straps!
Not really. When you lean a bike the force is still transmitted along the axis of the wheel. There is minimal side stresses comparred to fixing the wheel and pushing sideways on the seat or top of the bike.

Don't forget, this is a single sided shaft drive bike, not a chain drive with a fixed axle shaft across both sides of a swingarm.

Jim
JimVonBaden is online now   Reply With Quote
Old 11-24-2012, 04:44 PM   #10
bemiiten
League of Adventures
 
bemiiten's Avatar
 
Joined: Jul 2003
Location: Hamilton NJ.
Oddometer: 4,779
The rear swingarm moves through a arc, changing the wheelbase in the process, Kinda looks like the rear stand would inhibit that movement. I'd ditch the rear stand and use tie downs at the frame member that runs under the swingarm. That allows the suspension to move freely and keeps the tension on the tie downs more consistent then if they were attached to the passenger peg loops.
bemiiten is offline   Reply With Quote
Old 11-24-2012, 04:49 PM   #11
WVhillbilly
Beastly Adventurer
 
WVhillbilly's Avatar
 
Joined: Oct 2010
Oddometer: 8,049
I have this, works very well.
http://lockitt.com/Lockitt/product/TD/TDTD1502.html

Enclosed trailer has a Condor chock for the front.
WVhillbilly is online now   Reply With Quote
Old 11-24-2012, 05:20 PM   #12
JimVonBaden
"Cool" Aid!
 
JimVonBaden's Avatar
 
Joined: Feb 2005
Location: Alexandria, VA
Oddometer: 48,180
Quote:
Originally Posted by WVhillbilly View Post
I have this, works very well.
http://lockitt.com/Lockitt/product/TD/TDTD1502.html

Enclosed trailer has a Condor chock for the front.
Nice alternative to tieing to the suspension!

Jim
JimVonBaden is online now   Reply With Quote
Old 11-24-2012, 05:38 PM   #13
Chris41483
Adventurer
 
Joined: Sep 2011
Location: Alabama
Oddometer: 16
Quote:
Originally Posted by JimVonBaden View Post
Not really. When you lean a bike the force is still transmitted along the axis of the wheel. There is minimal side stresses comparred to fixing the wheel and pushing sideways on the seat or top of the bike.

Don't forget, this is a single sided shaft drive bike, not a chain drive with a fixed axle shaft across both sides of a swingarm.

Jim

The axis of the wheel is transmitted through to the swing arm.

I'm no expert rider, but I do understand mechanical systems. We may have to agree to disagree.

Of course, we could always meet in the middle and advise a strap be put on the front to assist in holding the bike upright. All bases covered!

Personally, I believe that after spending the almost 300$, and hauling it a few times with no issue, he is going to keep using this bracket no matter what we say!!!

***I just went and looked at the Lockitt tie down system. While I like that one equally as well (especially the price), if you use the wheels to hold the bike up, the effect on the swing arm is the same! The only way to reduce side load or tension is to use side load on the bars to hold the bike upright.

Chris41483 screwed with this post 11-24-2012 at 05:46 PM Reason: Info
Chris41483 is offline   Reply With Quote
Old 11-24-2012, 05:50 PM   #14
WVhillbilly
Beastly Adventurer
 
WVhillbilly's Avatar
 
Joined: Oct 2010
Oddometer: 8,049
My Condor chock holds my bike upright. Tie downs on the bars, but they don't have to be stupid tight.

When I unstrap the bike, it usually takes a couple pulls to get the front wheel out of the chock.
I have the trailer because I work on the road and it gives me a place to store the bike as well as transport it.
WVhillbilly is online now   Reply With Quote
Old 11-24-2012, 05:58 PM   #15
pielet97
Adventurer
 
Joined: Jul 2008
Location: Camden, NC
Oddometer: 35
Quote:
Originally Posted by Chris41483 View Post
The axis of the wheel is transmitted through to the swing arm.

I'm no expert rider, but I do understand mechanical systems. We may have to agree to disagree.

Of course, we could always meet in the middle and advise a strap be put on the front to assist in holding the bike upright. All bases covered!

Personally, I believe that after spending the almost 300$, and hauling it a few times with no issue, he is going to keep using this bracket no matter what we say!!!

***I just went and looked at the Lockitt tie down system. While I like that one equally as well (especially the price), if you use the wheels to hold the bike up, the effect on the swing arm is the same! The only way to reduce side load or tension is to use side load on the bars to hold the bike upright.
The difference between riding the bike and the pitbull is where the loads originate. While riding, the stresses initiate at the rubber and flow as the engineers modeled.

When using the pitbull, the inner potion of the hub will have acute compressive loads on the inner material, which are normally modeled as free. Although fatigue isn't an issue, the fact that the wheel is static may create stress paths that weren't modeled. Only the BMW engineers would know.

Another issue would be the difference in diameter. Theoretically, with enough stress, the inner tube will oblong the inner hub.

Will it matter, probably not, would I use it, no.
pielet97 is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 09:09 AM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014