Shimano Front Derailleur

[Darkmarkster]

On my Trek Madone 4.9 2010 i have a Ultegra Front Derailleur but ive just recieved a email showing Shimano Dura Ace front derailluers in the sale on Chain reaction cycles and im thinking of picking one up as they are at quite a good price but im not sure what size band/clamp i require?

I'd really appreciate if anyone could throw some light onto the matter,they only sell 3 sizes on the website also and the product link is below:

http://www.chainreactioncycles.com/Models.aspx?PartnerID=79&ModelID=28435

Thanks

 

[HJ]

The size refer to the diameter of the seat tube.

 

[Darkmarkster]

Ah right so if i measure the diameter of the seatpost then it should be about right?

 

[Smokin Joe]

Far be it from me to try and talk someone out of blinging up their bike, but in practical terms swapping from an Ultegra to a DA front mech will make as much difference to it's performance as shaving a single hair from your leg would to your aerodynamics.

However, if you know that already and just want to make the bike look good, then go for it...

 

[MichaelM]

Does your current f.m. bolt on to the band with bolt as shown in link? if so braze on. If not, seeing as madone is cf I suspect it's the 34.9 you'll need - take yours off and the size is stamped inside the band.

Alternatively, save yourself £55, stop being a bike tart, and ride what you've got