• A cheap replacement for Open PRO is Ambrosio Excursion, with similar enough ERD.

    I was hoping to replace open pro with excursions on a fixed wheelset (so i can rebuild the open pro to 105) with but the maths I did using values on spocalc gave me a 2mm diff in spoke length based on the different ERD.

    Do you reckon this is a small enough difference to ignore?

    I will recheck the numbers as was yesterday on computer, am typing this on phone.

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