New rider what size Cannondale?

My son in law (age 24) wants to get his first road bike.
He is 6' tall and the The LBS suggested a size 54 Cannondale.
Does this sound right?
I would have expected at least a 56 - but them I am a hobbit so I have no idea about proper bike sizes
Also he is keen on getting a bike with disc brakes - is it worth it on a £7-800 bike? ( he is hoping to get a deal as he only has £600 to play with) Or would he better getting a bike with better gears instead.
Any other recommendations?
He is 6' tall and the The LBS suggested a size 54 Cannondale.
Does this sound right?
I would have expected at least a 56 - but them I am a hobbit so I have no idea about proper bike sizes

Also he is keen on getting a bike with disc brakes - is it worth it on a £7-800 bike? ( he is hoping to get a deal as he only has £600 to play with) Or would he better getting a bike with better gears instead.
Any other recommendations?
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Waterford RS-14
Trek Domane SL6
Ridley Noah SL
A woman can never have too many bikes!
Waterford RS-14
Trek Domane SL6
Ridley Noah SL
A woman can never have too many bikes!
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BUT .. on the road its compliant, stable and quick. and these days feels totally normal to me
In comparison my other road bike is a Spesh Roubaix SL1 ... that's a 54 and to get the same position I am running a 130mm stem on it and a lot of saddle.
so if you do go for the 54, then you might need to run a lot of post and stem ... it will look good though
I'm 183cm (6ft) and was a perfect fit on a 56 CAAD12 w/110mm stem.
IG: RhinosWorkshop
I ride a 54 Synapse, and am 5ft 10, but I have long legs, and short torso - had they been more even, I would likely have gone for a 56.
Marin Palisades Trail 91 and 06
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Cannondale Synapse Adventure 15 & 16 Di2
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Specialized Allez Elite (Frame/Forks for sale)
Specialized Crosstrail Comp Disk (For sale)
Cannondale Synapse alloy with 'guards for the winter roads
Fuji Altamira 2.7 for the summer roads
Trek 830 Mountain Track frame turned into a gravel bike - for anywhere & everywhere
Very useful information.
He was looking at a Synapse.
We will probably go to a different store and try out some more bikes there - might look at the Giant Contend too.
Waterford RS-14
Trek Domane SL6
Ridley Noah SL
A woman can never have too many bikes!
There is currently a Tiagra spec'd evo pro (their entry level carbon) for £699.
https://www.ribblecycles.co.uk/ribble-e ... tiagra-se/
Thank you
Waterford RS-14
Trek Domane SL6
Ridley Noah SL
A woman can never have too many bikes!
But I guess, as a novice road rider who has only ever ridden an upright, heavy, steel "mountain bike" he probably wouldn't know what to look for.
Waterford RS-14
Trek Domane SL6
Ridley Noah SL
A woman can never have too many bikes!
I'm 186cm and have always preferred the more nimble feel of a slightly under size bike. I bought a 56 Evo which on paper is the correct size. While it was fine and rode nicely it always felt big. The opportunity to swap out that frame for a 54 came and I decided to jump. The 54 feels right and I've never regretted the decision to go down the size.
Racy v relaxed, I clearly prefer the former but that's just me and wouldn't suit everyone
Still, i would definitely recommend him trying it out.
My 56's were spot on, but lack of post (765mm saddle to BB) looked s**t
IG: RhinosWorkshop
Sometimes the different geometry (such as the classic looking flat top tube on the CAAD's) makes bikes look different sizes.