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  #1  
Old 06-22-2016, 12:13 AM
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Zuul Zuul is offline
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I Built a Hitch and Mono-Trailer for my K12GT

So I decided to build a hitch and mono-wheel trailer for my '07 K1200GT.

Originally I had considered buying the hitch from the folks in New Zealand, name escapes me atm, but I couldn't seem to get any information on what it looked like. The K12GT is an incredible looking bike and I just couldn't take a chance on having an ugly hitch.

The decision to build my own trailer was due to a few factors. First was price. A UniGo is not cheap and maybe a little small. A MonoGo is very reasonable but they don't ship to the US and I'm in Oregon so a 47 hr. round trip wasn't in the cards. TrailTail looks great and they just developed a connection that will attach through a BMW single sided swing arm. However, I'd like to see that connection get a bunch of miles on it before I buy into the concept. I'm confident it will do great, these guys are plenty talented, I just don't want to be the first purchaser.

I've based my design off several other trailers, taking a bit of direction from others I've seen. Originally, I had the wheel mid-mounted, like the MonoGo, but my tests were very unstable as the trailer seemed to wag back and forth, pivoting around the wheel. More weight made it MUCH worse.

The pictures I have up here, assuming I figure out how to upload them, are my final and heavily tested design. It handles like a dream. You barely know it's there. I've just returned from a So. Oregon to Santa Cruz to Yosemite back to So. Oregon trip with stellar results. It's nimble through corners, dead solid at all speeds up to 110 mph and seems to have no impact on fuel consumption or breaking.

I consider this a prototype and will, likely, make a few changes to both the hitch and the trailer.

If anyone is interested, I'd be happy to provide construction details.

Steve
Attached Images
File Type: jpg My_Bike_&_Trailer.jpg (284.2 KB, 115 views)
File Type: jpg Trailer.jpg (104.9 KB, 95 views)
File Type: jpg Trailer_Wheel_Detail.jpg (99.4 KB, 91 views)
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  #2  
Old 06-22-2016, 09:04 AM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Looks like it would pull great! And compliments on the construction. How exactly is the tongue connected to the bike - I can't quite figure that out (inquiring minds need to know) Lol !!
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Old 06-22-2016, 09:13 AM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Interesting effort and I especially like the mono-shock! Hopefully those are all lock nuts or maybe think about using them or double nutting? Nothing like wheelbase in terms of stability.

FYI, you posted in the RS/GT (brick) forum so hopefully a Mod can move it to either K12 or K13 Slant 4 forum. Fill out your signature when you get a chance, welcome and thanks for the post.
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Old 06-22-2016, 09:28 AM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Nicely done!!!!
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Old 06-22-2016, 09:45 AM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Very good.
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Old 06-22-2016, 03:12 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Looks great, but "no impact on fuel consumption"? That's a bit hard to believe.***MdMn**
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Old 06-22-2016, 09:24 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Quote:
Originally Posted by MNJ1300
Looks like it would pull great! And compliments on the construction. How exactly is the tongue connected to the bike - I can't quite figure that out (inquiring minds need to know) Lol !!
@ MNJ1300 - The hitch ends in a socket made of 1.25" steel tubing which allows the trailers 1" front tube to slide in nicely. A bolt through the socket and front tube keep in in place.

The final stage of the trailers 1" front tube incorporates a U-Joint made by Sweet Engineering. This allows the trailer to swing from side to side and up and down 30 degrees but does not allow it to roll. This U-Joint is actually designed for use in a race cars steering column.
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Old 06-22-2016, 09:27 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Quote:
Originally Posted by K-K
Interesting effort and I especially like the mono-shock! Hopefully those are all lock nuts or maybe think about using them or double nutting? Nothing like wheelbase in terms of stability.

FYI, you posted in the RS/GT (brick) forum so hopefully a Mod can move it to either K12 or K13 Slant 4 forum. Fill out your signature when you get a chance, welcome and thanks for the post.
@ K-K - I've used grade 8 bolts and lock washers throughout. I checked them daily with no slippage on the trip. Not sure if elastic lock nuts would be safer. Any thoughts on that?
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Old 06-22-2016, 09:30 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

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Originally Posted by mudman
Looks great, but "no impact on fuel consumption"? That's a bit hard to believe.***MdMn**
@ Mudman - I didn't do extensive testing on the fuel consumption. I just kept an eye on the computers reading of mpg. I'm not sure if that resets with a fill up or what but I've always hovered around 38 mpg and was in that range while towing this trip.
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Old 06-22-2016, 10:06 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

My '07 GT hovers around 44-46 mpg even up up 75-80 mph. So...I believe 38 with the trailer. Put simply there is no way the rig has no effect on fuel consumption. Especially loaded. MdMn
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  #11  
Old 06-22-2016, 11:18 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

I don't see a plate. Are you required to license trailers in your state?

FYI, I think nylok nuts are better than split-type lock washers for retaining a nut.
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  #12  
Old 06-23-2016, 12:02 AM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Sorry.. ..let the hate begin... ...while I appreciate the work and construction.. ..not for me.....



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07 kgt
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  #13  
Old 06-23-2016, 12:34 AM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Quote:
Originally Posted by kbikeinbc
Sorry.. ..let the hate begin... ...while I appreciate the work and construction.. ..not for me.....



kbikeinbc
07 kgt
Had no idea a difference in desires was hate.
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  #14  
Old 06-23-2016, 06:49 AM
XMagnaRider XMagnaRider is offline
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Re: I Built a Hitch and Mono-Trailer for my K12GT

I am very impressed. I would like to see some closeup photos of the attachment and U-joint to the K1200GT.
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  #15  
Old 06-23-2016, 06:53 AM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

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Originally Posted by XMagnaRider
I am very impressed. I would like to see some closeup photos of the attachment and U-joint to the K1200GT.
+1
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  #16  
Old 06-23-2016, 12:34 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Pretty cool. Do you know how much your trailer weighs? Looks like heavy steel tubing. I am also wondering how much extra load on the side stand with a loaded trailer .
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  #17  
Old 08-19-2016, 06:13 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

This is really cool!
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  #18  
Old 08-19-2016, 07:05 PM
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Re: I Built a Hitch and Mono-Trailer for my K12GT

Quote:
Originally Posted by mudman
Looks great, but "no impact on fuel consumption"? That's a bit hard to believe.***MdMn**

When I was pulling a Unigo, two up and loaded with gear, I got the same fuel milage as when
I was solo. Reason I believe was because I was flogging it when I was solo and very smooth
when I was pulling.
Hope this helps.
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