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I can confirm that a reasonable replacement sprocket in for my cast wheel Strada and probably the majority of cast wheel models was sourced from JT Sprockets : JTR1022.38 around £22 It's in 530 - I had wanted to convert to 520 but I already had a 530 chain and getting hold of this size sprockets was proving too much of a problem.

Thanks to Mike Smyth for the tip.

John McNally

Just to complete the loop on this one, following advice from Tom Ros in the ‘wanted forum’ I bought a sprocket from an MuZ660 which is a 39 tooth and in a 520 size. Readily available for about £20.

JTR18-39 is the code.

Not fitted it yet but it looks spot on.

Now everybody has easily available options for both 530 and 520 sprockets