Cube Frame sizing??

Hi,I Have seen a cube agree gtc pro bike,I am 5ft 8 ins tall inside leg 29".I have had 2 quotes on sizes one 53cm and the other 56cm.
The 53cm was a friend who has a cube already,hes a tad smaller than me and likes the small frames so he can sit in race set up position.The other 56cm size was recommended by email on a bike shop who sells quite a few of them.
I currently ride a specialized 54.5 cm frame and that is fine although the seat is high a tad.I know the obvious answer is go the shop and try but it is a bit of distance and i want to make sure they have the size available first.
Heard cube frames are a bit smaller sizing.???
Anyone out there who has one or good advice for size..??? :?
The 53cm was a friend who has a cube already,hes a tad smaller than me and likes the small frames so he can sit in race set up position.The other 56cm size was recommended by email on a bike shop who sells quite a few of them.
I currently ride a specialized 54.5 cm frame and that is fine although the seat is high a tad.I know the obvious answer is go the shop and try but it is a bit of distance and i want to make sure they have the size available first.
Heard cube frames are a bit smaller sizing.???
Anyone out there who has one or good advice for size..??? :?
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Posts
best thing to do its try some out, failing that check the geometry and find the one nearest your current bike.
similar to my 56cm Scott CR1 and another hybrid in a 56cm also. Both road bikes have about the same amount of seat post showing, but the Cube runs a 10mm shorter stem.
So I agree that they do come up small for a given size.
Cheers