I've been meaning to install a front derailleur on my steel Swift frame. I already have a double chain ring (54/39). Although, I have yet to use my 39 granny chain ring, I want a FD, to prevent the chain from popping off which it does occasionally and use it to shift down to the 39 (which may be rear) and back up to the 54 when I am done. It appears that a top pull FD would be preferable due to the frame design. The road bike FDs are bottom pulls while Mtb FDs are top pulls so Mtb FDs are the way togo but their specs limit the chain ring max to 46 to 48 depending on the derailleur.
I have posed the following question to the Nashbar Tech support but have gotten opposite answers.
Even though Mtb FDs have a max of 46 or 48 size rings, will I be able to use them with my 54/39 setup since I don't plan to shift beackand forth that often? One guy said you can but it won't be a smooth shift which is ok with me, while another said it probable won't work do to my size ring.
Can anyone shed some light?