It's something Daniel Salmon used to do on bikes with closer clearances. Supports the mudguard without the need for a bridge between the chainstays.
Sorry. I understand what you mean now. I read it ST as SS.
But yes you are right. I flattened the mudguards and slammed it up against the seat tube and the ST had a M5 boss now.
Nice bike btw
A local guy added this bolt to his pre-cursa, really neat. I wonder if you could fit the bolt through a strong spring or something for rattle-free adjustment if you decide to move the rear wheel forward or backward
@Hulsroy started
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It's something Daniel Salmon used to do on bikes with closer clearances. Supports the mudguard without the need for a bridge between the chainstays.