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1) Yep
2) Might as well save money on buying a chainset - I don't think you'll have any compatibility issues with a 10sp chainring and an 11sp chain.Happy to be proven wrong though - As I'm also going to be doing something similar soon...
pifko-
thanks, read a couple of reviews saying that the weight and stiffness difference is measurable between the two chain sets, and the bike has treated me nicely over the last 2.5 years (chains and cassettes regularly replaced) so don't feel any guilt at "splashing out" and have pulled the trigger, merlin have 10% off shimano at the moment so it was only a 33quid difference in the end, and feels like a treat rather than just a consumable purchase.
Sainsburys_Ed
I need to replace the drivetrain on my road bike, currently full 5700 105 set up, so have two questions:
1) can I re-use existing bottom bracket with a 4700/5800 chainset?
2) is there going to be a noticeable difference between a choice of a 5800 chainset, 5800 chain and 5700 cassette vs a 4700 chain set/chain/cassette?
There seems to be about a 40 quid difference between the two options. the 5800 chainset means that if I feel flush I can bring the bike onto 11spd to match my race bike for the price of shifters/derailleurs so has that benefit!