• 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.

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