As Ludwig points out, I was using two Campag cassettes, as the free hubs (often) are a simple swap, and I'm using a Chorus cassette with my 9070.
Hence the 29.
@Dammit started
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As Ludwig points out, I was using two Campag cassettes, as the free hubs (often) are a simple swap, and I'm using a Chorus cassette with my 9070.
Hence the 29.