Be careful what you buy. I've seen some pictures in MSX ChaingMai site that they have compared some of the Aluminum Swing Arms that were not re-enforced in the inside of them. They did a cut away to compare. The good ones were re-enforced and the other was hollowed.
I see that this thread was discontinued a good while back but would like to get some feed back concerning the alu swing arms on the market. I was looking at the TYGA website and see they make two different models. One is top braced and the other is under braced. Is there any difference in rigidity or is it purely an esthetic preference ?