Odd noise from a fixie - thought initially it was noise from the pedals, now believe it originates in the seat/post joint or seat post/frame joint. Tightened both securely, but the squeaking continues, probably from the slight continuous rocking on saddle. Aluminum frame, carbon seat post, seat & seat post designed as a unit therefore not an issue of fit.

Does anyone use a lubricant at these joints? Suggestions?