Calculator for fixing bikes with vertical dropouts
I just wanted to say how sweet this chain length calculator is. I was trying to build a single speed out of a bike with vertical dropouts. I wasn't sure which chainring/cog combination was going to give me the proper chain tension. I found this caculator which basically lets you tell it your chainstay length and it spits out what chainring/cog combos will come close. It worked brillantly:
http://www.peak.org/~fixin/personal/fmu/php/formfmu.php