Gerard- a parts spec please

[Monk]

On P2k, I am switching from UL to DA. THe braze on clamp is remaing the same. WhHich of these FDR’s do I need:

#SH-FD7800V



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Braze on with Clamp 34.8mm More rigid for faster shifting under higher loads. The new Dura Ace front derailleur boasts wider and reinforced pivots and a super-strong cage. Narrower cage to accommodate the new Shimano 10-speed chain. 75 g For 28.6 or 31.8 clamp size us SH-FD7800. For Braze on use item SH-FD7800B.

Shimano Dura Ace 10 sp Front Derailuer FD7800 Clamp-on

#SH-FD7800



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More rigid for faster shifting under higher loads. The new Dura Ace front derailleur boasts wider and reinforced pivots and a super-strong cage. Narrower cage to accommodate the new Shimano 10-speed chain. 75 g Specify 28.6 or 31.8 clamp size. For Braze on use item SH-FD7800B. For 34.9 clamp with derailuer use SH-FD7800V.

[Tom_Demerly]

The bottom one for the braze on mount on the P2K frame. The clamp on mount won’'t work on an aero seat tube unless you do the minor mechnical surgery needed to disect it to its basic parts and re-configure it as a braze on.

Better to buy the specific braze-on.

[Monk]

Thank you Tom, but both of these I listed say “For braze on use 7800B” which is this one: So this would be the one? and I just pull it off thebraze on fitting and attach to the existing braze on fitting?

Shimano Dura Ace 10 sp Front Derailleur FD7800 Braze-on

#SH-FD7800B



Click for more pictures
More rigid for faster shifting under higher loads. The new Dura Ace front derailleur boasts wider and reinforced pivots and a super-strong cage. Narrower cage to accommodate the new Shimano 10-speed chain. 75 g For 28.6mm or 31.8mm clamp size use SH-FD7800. For 34.9mm clamp with derailleur use SH-FD7800V.

[Darrell]

You want to use the #SH-FD7800B.

I think both listings say “For braze on use 7800B” to help steer people to the correct one and reassure them that they are looking at the right one.

The braze on fitting is actually the piece on the bike which you attach the front der. (#SH-FD7800B) to. It’s the little piece of metal sticking out from the frame.

The #SH-FD7800B doesn’t come with a braze on as it is already on your P2k.