They probably are. You'd be hard pressed to find 4mm bright or cromo steel plate.
Measure the centre of BB to centre of drop out and use a magic gear calculator (just google it). I ran a Ribble winter trainer fixed for a while with a magic gear and a half link in the chain, worked great. I also filed a bit out of the drop out, which is easy with aluminium, though you've not got a whole lot of material to play with there.
They probably are. You'd be hard pressed to find 4mm bright or cromo steel plate.
Measure the centre of BB to centre of drop out and use a magic gear calculator (just google it). I ran a Ribble winter trainer fixed for a while with a magic gear and a half link in the chain, worked great. I also filed a bit out of the drop out, which is easy with aluminium, though you've not got a whole lot of material to play with there.