Custom rear carrier with backrest - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 7 Old 07-21-2017, 04:13 PM Thread Starter
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Custom rear carrier with backrest

Just joined the forum and decided to post the project I just finished up. The position of the givi mounting plate is waaay too close to the passenger and I don't particularly find their backrest pad very comfortable. So I decided to design a system that is completely adjustable in that the givi mounting plate can slide back and forth on aluminum t-slot rails. I have uploaded a few pictures and you can pm me for a link to my google drive album for more pictures in better resolution. I built the whole project in Autocad then purchased 90% of the parts from 80/20. The only truly custom fabrication work was cutting/drilling the two steel plates that held the backrest and slider. I also drilled the holes in the z-channel that the creates the 80/20 rails to vstrom stock carrier connection. I bought the backrest for $80 off ebay and is made for farm tractors. It came with (4) M6 tapped holes in the back. I can provide anyone with a shopping list and cad pdf drawings if there is interest in reproducing this. For those who don't want the backrest or givi trunk, you can mount anything to these rails with the slide in square nuts. I'm happy to design other projects for people using this vendor, just pm me and we'll get to it.

The Function:
So the givi mounting plate is mounted to the rails with square nuts and can slide anywhere on the 1-1/2" rails. The smaller 1" tubing with the backrest slides into a Teflon bearing with a rotating handbrake. It can slide all the way back for the passenger or forward when it's just me driving long distances. This rail DOES flex and twist but will not slide back because of the brake. It was designed this way so that as the person moves or leans, the backrest moves with them. As a driver, I can lean into corners and the backrest follows me. The backrest can also move up and down, but requires a hex key. If I was really ambitious I could have added another slider and brake for quick adjustments but each slider is $45.

Price:
$200: 80/20 parts ---->$100ish without backrest sliding parts for those who just want a rear carrier
$80: backrest via ebay
$15: 1/8" steel plate
$3: 5/8" nylon bushings via home depot
Attached Images
File Type: jpg JUST RAILS.jpg (9.7 KB, 50 views)
File Type: jpg BACKREST RAIL.jpg (8.9 KB, 35 views)
File Type: jpg GIVI PLATE.jpg (10.4 KB, 35 views)
File Type: jpg PASSENGER.jpg (20.9 KB, 39 views)
File Type: jpg DRIVER.jpg (27.5 KB, 37 views)
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post #2 of 7 Old 07-21-2017, 04:17 PM Thread Starter
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Link

I couldn't figure out how to upload higher res photos so here is the drive link:

drive.google.com/open?id=0B851s0P4923PeTZHX3h0MTh1UjQ
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post #3 of 7 Old 07-21-2017, 04:33 PM
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It's a cool design; always nice to see another fabricator/do it yourselfer on here.

A question about that horizontal track that the backrest slides back and forth on. It looks like the track is right in the center of the backrest; if you get hit from behind hard enough, is that going to impale you or your passenger in the lower back?

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post #4 of 7 Old 07-21-2017, 04:44 PM Thread Starter
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The end of the rail is flush with the back of the givi mounting plate. It would take significant force to displace the mounting plate attached to the fixed rails and then push the backrest in. At that point, it would be a pretty bad crash. Good catch though, didn't think about that.
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post #5 of 7 Old 07-21-2017, 04:49 PM
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I hated to be "that guy" and seem like I was picking your design apart; the position of the rail just kind of jumped out at me.

I'm a DIY guy too. If you go to my profile page, there are a bunch of projects I've made over the years.

"No matter where you go, there you are."
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post #6 of 7 Old 07-21-2017, 07:26 PM Thread Starter
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No worries! Critique is all part of the process. I'll try to tweak it in the cad file if other people want to try out this rack.
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post #7 of 7 Old 07-24-2017, 08:06 PM
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That is a good idea and the work looks neat. Whether it fit roadworthy safety laws , I can tell, but I love the idea of the moveable backrest for long trips.
I don't know how likely to to have a rear end crash on a bike , also given how high the top box is , the chances are lower, but not impossible.
Solution: use rails that collapse into itself or a rail into a rail , secured by thick screw or something that will break in case of a strong impact (the end facing the front of the bike needs a strong plate to hold the incoming rail) . By doing that the pillion wont have a road in the back but a push from the backrest.
Suzuki people will tell that you are moving the center of gravity of the bike and such and such.. but that happens every time we add anything into the top box.
Just a bit of safe engineering added to a great idea.
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