i had this problem as well on that small azz pilot. even the side entry didn't work because there simply wasn't enough room for the polar bottle.

ya know what my solution was??? i got a bigger, standard geometry bike!! have 2 arundel cages that work great so far. i haven't tried the polar bottle yet, but it really doesn't matter if it fits or not. the biggest thing -- this bike fits. off topic tho, sorry.

cuda - those cages in the last picture didn't work for me either.