groupset

2013 Dura-ace Di2 or mechanical? Which do you reckon?

Hello everyone,

I've got a Specialized Allez 16 and im looking to upgrade my groupset.

Since my bike has a square taper BB, what upgrades can i actually get? And would i be able to swap out the bottom bracket for a better one eg, hollowtech type?

Hope someone can help, maybe someone has already carried this upgrade out.

Thanks

Rikki

Shimano TT Dura-Ace 7900 Shifters
Shimano 105 Black 5700 Brake Set,
Shimano 105 Cassette 10sp 5700 12-26
Shimano 105 Double Front Mech 10sp 5700 Braze On,
Shimano 105 Rear Derailleur 10sp 5700 In Black

All brand new and never used taken off a Cannondale Slice 2012 TT bike

Postage is £10 (courier)

Can throw in a Shimano 105 chain for an extra £10 if you require

£210

also I have the crankset BB30, bullbars, tri bars and saddle available too

message for details

Looking for £80 posted after I had my time wasted on auction.

*ATTENTION*

It has come to my attention that people think this groupset is full and comes with a chainset. I did clearly state what the groupset consists of. If so, you can still bid on the parts which it comes as, or leave it. Just thought I'd inform you all of this that is DOES NOT come with a chainset[