GS 6mm Allen Top Pivot Bolt in Nice Used ConditionNice used pivot bolt. If you have a GS rear derl, with a missing pivot bolt, this is what you need. Measures 27.5 mm from end-end. 2.00 in the US. 4.00 to most international. $13 via priority mail to Italy. Please see my other auctions for Huret, Simplex, Campagnolo, Cinelli & more.