Aluminum swingarm quest

[RDFL]

What Tracs look like now. --

[sav0r]

It looks great, but it's an absolutely silly design.

[oxford]

What Tracs look like now. --

I had that picture in my head and couldn't remember who made it.  I can't believe they use solid bar stock and mill pockets in it. 

[Jspooner]

It looks great, but it's an absolutely silly design.

What's silly about it. It's kind of ingenious if you think about it and I'll bet it's not as heavy as you think it also might be less time to make that way. I like it.

[sav0r]

It's almost certainly heavier and weaker than a tubular design. They could have at a minimum done some actual shape optimization on those pockets. It's ingenious because they realized they can minimize their mill and weld operations to maximize their profit. Otherwise it's an inferior product. For the record, I don't actually see that arm on their site for RD's, or any other model for that matter. So maybe they have since discontinued it?

[RDFL]

Other way around it replaced the one pictured on site.

[suey1958]

Very Nice looking design in my opinion,...I like it

[85RZwade]

+1 for the Motolanna

[m in sc]

just looking at the 2 designs, the motolanna arm is going to be stronger where it matters.  the curve in the leg, the strengthening ribs on the outsides, etc. very well done, much more elegance of function of design. the trac arm is pretty clunky buy comparison. but, to be honest, on an rd, no one will ever come close to testing the strength of either. 

[SoCal250]

the trac arm is pretty clunky...

That's exactly how I was going to describe it. Clunky looking

[pdxjim]

That's exactly how I was going to describe it. Clunky looking

Yup, and on a 2T twin with no torque, keeping everything as light as possible, and just strong enough is key.

Alloy has the bling, but in this application, chromo is the way to go.

[sav0r]

Can anybody provide me the dimensions of the rectangular tube stock on the DG or similar swing arm?

[RDFL]

Very Nice looking design in my opinion,...I like it

Me too, looks way better than their original.

[RDFL]

The Motolanna and the Trac both look clunky the Trac less to me. The original Trac looked really clunky but tuff.

[m in sc]

having have seen both in real life, im going to have to disagree that the motolana looks clunky by comparison.  either way, regarding the square stock, just use off the shelf.  https://www.onlinemetals.com/en/buy/aluminum/1-5-x-3-x-0-125-aluminum-rectangle-tube-6061-t6-extruded/pid/7021