You should check out JensonUSA. They have Falcon HG freewheels, I'm hoping that my Simplex Cirterium can handle the 28 cog...it'll be a close one that's for sure.

http://www.jensonusa.com/store/produ...Freewheel.aspx

I rarely used the 52-13 on the tour de france so I didn't mind the bump to 14, but I WILL enjoy the bump to a 28t cog when I ramp up a hill .