I'm 5'10'' with a 32 inch inseam. I've been riding 172.5 cranks for the last 15 years. I'm about to set up an old made in France Eddy Merckx frame that I found at the dump into a fixed gear. I have a DuraAce crankset from about 1992 that I plan to use but it is also a 172.5 crank length. Is it bad to ride a fixed gear with the longer cranks? I will also still be riding my road bike and that is equiiped with 172.5's. Would it be a bad thing to be riding 2 different crank length's. What do ya think?

Thanks,
Bob