I used a short cage Ultegra derailleur, using the limit screws back in 2003-2004 on my single speed Rampage bike. Worked flawless, otherwise there's dedicated tensioners out there you could use.
I was looking at the SB One. On their site it says good for 14 or 15T cogs. I don’t know if that means their cogs or any cog in general but I would be running 19-21T.
Someone posted this a while back with the SB One. Ryan Sullivan?
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