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I use a 13-21 with a 53/42 and a 13-23 with a 53/39 (7 speed). I don't think I ever used a 12 even when racing. I used to have a friend who could outsprint anyone with his junior gearing (do they still do that?). Once I've spun out in my 53x13 I figure I'm going fast enough.
 

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Excel spreadsheet



I have one that I created that you input your cadence and cog combos, and it graphs MPH and gear ratios for you automatically. Just email me at surveyor12 @ comcast . net and I'll send it.
I was wondering if you could share your spread sheet chart with me. I tried send you an email but guess this is outdated. I’m trying to learn as much as I can, being a road bike enthusiast with just 6 months into riding during this pandemic. I’m in fairly good athletic shape for an older gentleman. I’m riding 100+ miles a week, northern California.
Still learning. I’m currently riding used Specialized Allez Elite 2006-7, which I just upgraded to 10 speed altegra groupset - 53/39 and 11/28. So far I’m loving this new found venture.
 

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Matnlely Dregaend
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4,867 Posts
I keep this semi-updated... gain ratios are at the bottom.

 
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