Dear the internet;
The last thing i need to replace on my bike before it is the best bike ever built is the cranks. I was thinking about getting an IRO build kit (http://www.irofixedgear.com/index.as...PROD&ProdID=13) since my bottom bracket (shimano 600... 1987) could probably be replaced, and well, i've never replaced a bottom bracket before and i'd like to learn.

Anyways- is this a good deal? is there something better i should look for? Is it stupid for me to be getting a bunch of new stuff when i really like the way my bike with it's cheep-ass old cranks and old school (but nice) bb allready rides? does anyone know off hand if i can replace the 46 tooth cog?

appreicating your response in advance...
-musicsucks.