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@SideshowBob I am on the same journey. I had come down tentatively on an FM as I wanted a low gear for the hills around me. @clubman good to read the alloy shells don't save much weight. I thought you'd said it was the weight from a lamp boss stopping you getting 59:59 for a 25, but reading back you blamed air turbulence :D
Edit: in case you haven't seen it, this is useful http://genetics.mgh.harvard.edu/hanczyc/pdfs/satriggersjuly06.pdf
Thanks very much for the information, I'll look into what will suit me best.
I'm currently just using my Gillott and only use 2-3 gears for most of the time and will check what these are as the AM could be good for me.