Originally Posted by
Alphavillage
Here's mine I just finished building.
Super frustrating to figure out the tubing. A lot of signs point to SL because of the Team tab race number hanger.
But most aquila's were SLX/TSX (pdm's)...
To determine the tubeset, you need to remove the bottom bracket and look inside the shell to check the interior of the tubes. If the insides of the tubes are smooth, then it's SL. If there are five helical ridges, then it's SLX or TSX. The difference is that SLX's ridges only extend about 100mm up the down tube and about 150mm up the seat tube. TSX's ridges extended the entire length of the down tube.
The ridges are quite narrow and thin (3.5mm x 0.35mm), so they can be hard to see, use a good light or feel for them.