52t FSA chainring and EAI Keirin Tool or Super Track Tool (depending on who you buy it from).
I've always wanted to give this tool a try. It's very well made. The only down side is that it doesn't work on 12t cogs. It will work in 13t - 16t, which is not coincidentially the size range in which Shimano NJS cogs come.
I guess I'll just have to keep the 12t on all the time then...
