Timex Cycle Trainer 2.0 tire size?

I recently bought a Timex Cycle Trainer 2.0, and so far I like it. Computers I have used before have been pretty basic, so I am having fun with all the functions, HR monitor, cadence, etc.

My problem is I can’t get it to enter my proper tire size! According to the manual, with my 700 x 23 tires I should be entering 2097, but it only is letting me enter 2 numbers, and 82 isn’t accurate enough for my taste…

Anybody use this? I have exercised my Google-fu and Kung-search on this forum with no luck…

Thanks!