Front derailer: pros and cons of seat tube mount vs BB mount?
Well, the headline says it all really. Am looking to buy a new (MTB front) derailer, and suddenly realized there was another option I hadn't considered. Never used a BB mount before.
The BB mount seems somewhat neater, but I imagine alignment might be trickier.
Seat tube mount is an old aquaintance; I'm not worried about any surprises there. It's certainly worked well enough before.
'''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Bottom bracket mounts are usually limited to suspension MTBs and other bikes where the seat tube is not round and has no braze-on mounting tab. Also, check to be sure the bb mounted derailleur has the cable pull from the correct direction as many MTB's use a top pull arrangement and that's unusual on road bikes.
Me? If a seat tube clamp-on or a braze-on adapter fits, that's what I'd use.