Never used the Silca calculator before. It recommended 60ish, I've been running 52ish based on the Rene Herse calculator and will continue with that.
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A race bike in any era is a highly personal choice that at its "best" balances the requirements of fit, weight, handling, durability and cost tempered by the willingness to toss it and oneself down the pavement at considerable speed. ~Bandera