Originally Posted by
seamuis
4. You may run into some trouble getting your chainline correct, which could mean making modifications to your crankset and bottom bracket. Such as moving over to a shorter bottom bracket spindle, if you try to utilise your current crankset. It could be in your interest to invest in an affordable ss/fixed/track crankset and bottom bracket. This will make the conversion easier, but isn’t required.
Quite often, all that is needed to get an acceptable chainline is to run the chainring on the inner plateau of a double crank. I'd try that first before investing in a different bottom bracket and/or crank.
5. Running a 1/8” chain isn’t required. You can still run 3/32 chain, even with fixed. But if you want to run fixed and you want to upgrade your crank and chainring, you’ll find more options for 1/8” setups and 144 BCD cranksets.
Running 1/8" chain has the additional advantage of allowing you to mix & match 3/32" and 1/8" cogs and chainrings. 3/32" chain will only work with 3/32" cogs and chainrings.