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I've got a 1" quill syncros stem at a massive 180mm, it's kicking around in my shed if there is anyone out there with arms that extend to their knees... I doubt you'll ever find longer!!!
Much to my disappointment, I dug out my syncros stem, and measured it, and it's only 170mm. Here I was going around deluded, thinking I have the longest stem on Retrobike, and then boasting about my length in public. .. I'm a fraud.... perhaps we need to start a thread looking for the 'longest' in a variety of categories...
stem
top tube
bars
crankarms