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  #1 (permalink)  
Old 01-31-2010, 06:31 PM
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Rigid to a Softtail

Hello to everyone as I'm new to Club Chopper. I built my bike as a rigid originally but now that I've had issues with the frame I'm going to change it over to a softtail. I bought a RSD swingarm for it and my question is does anyone know where I need to place the swingarm in reference to center line of the bike (side to side). In the picture you can see what I have so far; it is centerlined off the rear axle...don't know if this is correct or not. Any help is appreciated.
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  #2 (permalink)  
Old 02-01-2010, 08:34 AM
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RSD, the ass end is set off to the right to clear chain or belt. I'd get a look at a RSD softail frame to get a better idea.
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Old 02-01-2010, 11:37 AM
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I'd say it would also depend on the width of your rear tire choice as well. Anyway, there are far to many variables to give a known "fiixed" dimension for off-set. I would try to keep the centerline of the swingarm centered on the centerline of the frame so you dont have trouble with fender alignment when it comes to that.

[edit] You need to have the RSD trans installed as well so you have a referance point for belt/chain clearance before you start to weld up parts.
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Old 02-01-2010, 12:26 PM
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ive never heard of anyone turning a rigid into a softail.

Good Luck!!
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Old 02-01-2010, 12:37 PM
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Looks like it may have been a used (or previously finished) frame judging by the pinstripes and finish paint.
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C'mon Scary, theres a decending order of cool and WCC is at the top, we all know its true and the only thing that would make me cooler would be a bike with a vagina I could fuck start in front of 7-11 during a scratch off banaza sale. Cole 02/15/09
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  #6 (permalink)  
Old 02-01-2010, 07:19 PM
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Yeah MAKO6, I finished the bike in 2006 and rode it until last year when the seat tube cracked on the way to work one day. I had brain fade when I built the frame originally and used too thin of tubing on the seat tube. So I had to cut it out and repair it anyways so I decided to go ahead and make it a soft tail. There was some other stuff I wanted to fix on it anyways so I thought now was as good a time as any to finish the bike the way I want to.

Seanpd
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Old 02-01-2010, 07:37 PM
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You are just going to have to do some measuring and math. Softail swing arms are normally asymmetrical (one side different than the other). A wider version may be more so.

As pointed out, you will need to backward engineer things from the drive chain (belt) to the trans and set the swing arm about those needs. Loose the tube top wishbone tube and use a 1/4" 2x3 fabricated angle (section of a structural tube works nice). Use 5/8" thick stanchions (vertical parts that the swingarm pivot on). 1/2" can also be used but keep top section width to over 1-1/2" and the bottom part closer to 2" minimum. A token 1/2x1/2 solid bar is normally used at the bottom of the stanchions to support their width but has to stay out of the way of the swingarm and shocks.

Pay special attention to the seat post. If you think the rigid was under stress, you can imagine what will happen when the forward shock mount is added. All suspension force is on the center seat post crossbar (rectangular tube at bottom of frame rails) and the seat post tube itself. Take a look at aftermarket frames and notice the reinforcement plates in the engine/trans/shock area. This link from our site shows a softail frame and the mentioned seat post area if you look through the pictures: http://www.mechwerks.com/Frame_Jig.htm
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Old 05-30-2010, 03:26 PM
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Well I've finally made some progress on the rebuild. Here are some pics of the work so far.
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Old 02-27-2011, 07:32 PM
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More Progress

I've been able to get some good work time on my bike and make some real progress- finally. I welded it all up today and was able to start the mock up. I still have to make a shock mount but will wait till the shocks arrive so I set ride height and set shock length to get the mount in the right place. Hope to have it done by end of May
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Old 02-27-2011, 08:19 PM
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You'd be spending better time by replacing the entire frame. You'll be spending a lot of time just making jigs to line up & weld the side plates for the swing arm + getting the swing arm to track straight behind the frame.

Can it be done - of course. But why spend all that time when you'll have less $$ & time invested in a nice ST replacement frame.

Then again ... it is good experience - just be safe about it. Not sure how many frames you've done prior but ... just because someone said it can be done doesn't always mean you actually need to do it.

PACO
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