Swinging Arm specs

[Bitza]

Hi all, I've got a question for the knowledgeable. I have until recently believed that the first s/a had the suspension hoop, 17mm dia spindle, and narrow wheel hub. Then in 1998 I thought the hoop changed to a rod, the spindle dia increased to 20mm(?) and the hub width was increased. But I've come across post 98 s/a advertised with the early type hoops. My question is were s/a made with the hoop, larger spindle for a wide hub. Secondary question if the answer is yes, were any of them made in aluminium?

[Bitza]

Have given this a bit more thought, I'm now thinking that I've got the cut off date wrong, maybe 2002 instead of 98. So what changed in 98?

[Mr Gazza]

I don't think anything changed in '98?
The change to rod suspension came late 2001 (probably August?)
It came with the "new" frame based on the ST version and a 25mm rear spindle.
Hoop and rod swinging arms are available in steel and aluminium depending on the model spec.
Nasher has got some ally swinging arms for sale.