RecordAceFromNew
Swinging Member
- Location
- West London
Probably a few hundred grams, if that, not a lot. 105 is epic in weight vs top end groupsets though! Half a kilo or something.
If one wants light, Campag and Sram equivalence are lighter.
However, if there is a limited budget, higher groupset is generally the wrong (albeit most popular ) thing to go for simply because they are all "decent" nowadays. Better wheels is where money (~30% of budget is not unreasonable) should usually be spent. The Caad8's are a case in point - even top models have some Maddux rims on various low end hubs, so you will end up with wheels weighing well over 2kg a pair. I would get a cheaper yet acceptable groupset, let them keep the stock wheels, and pay extra for some proven, quality Mavic/Fulcrum/Campag/Shimano or handbuilt ones.
Just my 2p.