Sell spare Ultegra 6800 Groupset or Upgrade my winter bike?

[Steve vRS]

I have a full Ultegra groupset (apart from the bottom bracket) taken off my TCR that was destroyed in a crash. I can't decide whether to sell it or change the 5700 105 set up on my old Defy 1. In particular as I've already robbed the rear clipper to replace a seized one off the defy.

If I sold, what is a realistic price for a used Ultegra groupset. The ones on eBay appear rather overpriced but if that is the going rate...

[Steve vRS]

Bugger it. I seem to spend most of my time riding the Defy so I'll treat it to an upgrade and sell the 105 stuff.

[Steve vRS]

Bobley said:

Before doing anything too hasty you need to see whether you can get an 11 speed cassette on you old Defy rear hub.

It's on its 4th set of wheels. I either wear them out or crash them