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Unread 03-02-2009, 06:04 PM   #1
Xtant
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Fabbing a subframe for my bike...

I've got an idea to "bob" my SV. It's not an original idea, but I don't like most of the ones out there.

First, a couple pics of bobbed SVs:

What I like, but the seat would sit way to high for me:



Very clean and very minimalist. He has probably the nicest example of a bobbed SV.

What I don't like is basically just a shortened subframe. It's not bad, it's just not minimal enough for me. An example:



Here's my plans, I just need to know if it will be plenty strong to support a rider (namely, Me ).



Black and blue are the frame of the bike. White holes are factory mounting points for the factory subframe. Green is a gusset. Red is my new subframe. 1" square tubing is what I'm thinking 1/8" wall. The gussets, 3/16" plate or whatever I have lying around. I'm thinking that should be plenty strong to support my, or anybody else's, ***.

I pull my steel out of the drop pile at one of the local suppliers, so my materials are pretty much whatever is available in the quantity closest to what I need. What would the minimum tubing and wall be that would still be plenty strong?

This will be welded with my shop's MIG.

I hope that's clear as mud

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2004 Wrangler X: 4.0 auto, black on black on black, REBB, 1.5" JKS BL, 1" JKS MML, 33x12.5x15, Black Soft 8's, homemade front bumper and steering skid...more armor to come in a year or so
1989 Mustang GT vert: stripped shell of a project that hasn't been started.
2006 Suzuki SV650S: Went nekkid. Aztec8 setup, Pazzo levers, M4 full Ti exhaust, PCIII, Poly26 belly plan, GSXR rear shock upgrade, Sonic springs and emulators
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Unread 03-03-2009, 04:16 AM   #2
VACJ5
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Dude, I can't wait to see this...
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Unread 03-03-2009, 06:45 AM   #3
lurkeryj
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sv's rock. i love mine
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Unread 03-03-2009, 06:51 AM   #4
prjohnson
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Let me give you a warning about making it like the one in the first picture....Don't wear anything you care about, you'll fling all kinds of stuff on your back.

Ask me how I know...
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Unread 03-03-2009, 03:18 PM   #5
Xtant
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I'll putting a hugger on, too. Don't need that much of a roooster tail flying up my back

I'm trying to piece together the parts I need, right now. Budget is slim, but hopefully by mid-summer I can have a bobber.

Here's mine, minus the Poly26 chin:



So...do you guys see any major flaws in my design?
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2004 Wrangler X: 4.0 auto, black on black on black, REBB, 1.5" JKS BL, 1" JKS MML, 33x12.5x15, Black Soft 8's, homemade front bumper and steering skid...more armor to come in a year or so
1989 Mustang GT vert: stripped shell of a project that hasn't been started.
2006 Suzuki SV650S: Went nekkid. Aztec8 setup, Pazzo levers, M4 full Ti exhaust, PCIII, Poly26 belly plan, GSXR rear shock upgrade, Sonic springs and emulators
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Unread 03-04-2009, 06:19 AM   #6
prjohnson
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I don't see any problems with it. Will you be able to use your existing battery tray?
I've seen plenty of things like this done on k a w i f o r u m s.com
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Unread 03-04-2009, 10:39 AM   #7
mudwhoreTJ
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I always thought that "bob" meant battery operated boyfriend???
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Unread 03-04-2009, 03:02 PM   #8
oteps
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Sv's are fun, i race a sv1000 and 650. The second pic would probably work better because you need room for the battery, fuse box, ecu and a couple other things. Where are you going to put the taillight and turn signals? Or dont you need them where you live? It would be easier to get a subframe off ebay and cut it, then reinforce it with a couple tubes. That way you can have an exhaust hanger and put the taillight under it so the cops dont bother you.
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Unread 03-05-2009, 08:51 PM   #9
kzjim
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Quote:
Originally Posted by lurkeryj View Post
sv's rock. i love mine
Nice!! I like it
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Unread 03-10-2009, 04:16 PM   #10
Xtant
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Friday I'm going to buy the steel and get started. One last question. Square tubing, better bent or cut and welded? I cannot bend anything, but I've found a local fab shop that would do the six bends I would need.

What are the pros and cons of bent vs welded?

Just checked on Air filters. Need to go to pod style for room for battery and electronics under the tank. The air filters (one for each throttle body) are $40 a piece
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2004 Wrangler X: 4.0 auto, black on black on black, REBB, 1.5" JKS BL, 1" JKS MML, 33x12.5x15, Black Soft 8's, homemade front bumper and steering skid...more armor to come in a year or so
1989 Mustang GT vert: stripped shell of a project that hasn't been started.
2006 Suzuki SV650S: Went nekkid. Aztec8 setup, Pazzo levers, M4 full Ti exhaust, PCIII, Poly26 belly plan, GSXR rear shock upgrade, Sonic springs and emulators

Last edited by Xtant; 03-10-2009 at 04:34 PM..
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