Question: I am replacing the front deraileur on my 2002 Giant Iguana frame with a Shimano LX drlr. I am unsure of the clamp size as it comes in 3 different ones: 28.6 mm, 31.8 mm, and 34.9 mm. I have a 31 mm seatpost, and thats all the info i have. there is no info from the giant homepage, and my lbs (over the phone) didnt know, but guessed 31.8. i think it would be 34.9 with that size seatpost though yes? anyone with any info i'd appreciate it!