Join Date: Aug 2008
Location: New Salem, PA (Near Pittsburgh)
Bikes: Pinarello Stelvio Road, Cannondale Rt1000 Tandem, Gary Fisher MTB
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Unfortunately X MPH solo doesn't always translate into Y MPH in a race. Besides, average speed is not as critical as the ability to accelerate, ride on the rivet, recover, and then keep up with the next acceleration in a race.
The only way you can know is to go out and race. If you get blown off the back, so what? Get some more intervals in and then go out and race again.
The Central Park loop has only a couple of uphill grades which will likely be the point of attack.
A fixed gear might work on the track, but I don't think you want to mix it up in a crit on a fixed gear, IMHO.