Cube Attain GTC SL Disc - 56 or 58 frame?

[Purrple]

Hello there!

I'm thinking about buying Cube Attain GTC SL disc "endurance" road bike ( https://www.cube.eu/en/2017/road-triathlon/attain/cube-attain-gtc-sl-disc-carbonnflashorange-2017/ )
I am new to road bikes, and i need some opinions and help: Should i get 56cm or 58cm frame?

Heres my measurements (might vary) from competitivecyclist.com :

Actual inseam 90 cm/35.4 in
Trunk 63 cm / 24.8 in
Forearm 37 cm/ 14.5 in
Arm 70 cm / 27.55 in
Thigh 64 cm / 25.19 in
Lower leg 57 cm/ 22.44 in
Sternal notch 154 cm/ 5.052 feet (5 feet ⅝ inch)
Total height 185 cm/ about 6ft 1in

And Here is what the calculator suggests to me:
The competitive fit
top tube length
55.4 - 55.8 cm/ 21.81 - 22 in
seat tube range CC
58.3 - 58.8 cm/ 22.95 - 23.14 in
seat tube range CT
60.1 - 60.6 cm/ 23.66 - 23.85 in
stem length
11.8 - 12.4 cm / approx. 4.72 in
BB saddle position
77.2 - 79.2 cm/ 30.39 - 31.18 in
saddle handlebar
55.8 - 56.4 cm/ 21.96 - 22.2 in
saddle setback
7.6 - 8 cm / about 3.07 in

Top tube is the most interesting here, 58cm frame has 575mm long top tube, with 73 seat tube angle, and 56cm frame has 560mm long TT, with 73,5 STA. So, 56 would be perfect to me, if I only chose it because of top tube, but would it be too small frame otherwise? This is what im struggling with. Maybe going try some bikes from LBS next week, they dont have any cube bikes tho.. Any suggestions and tips are most welcome!
Cheers!

 

[vickster]

Find a cube dealer, try them out and see. No one else can tell you what size bike will be best for you. If in between, it's usually better to go smaller

All bike have different geometries, so trying a different brand probably won't give you what you need

 

[StuAff]

@vickster has nailed it. Go and see a dealer. Preferably dealers- you might find something more to your liking elsewhere. Your LBS might have just what you're looking for. I've bought two frames on the measurements alone, but (well before that) I had a proper bike fit done by my LBS, so I could compare the measurements to those of the bikes I already owned and those frames were set up by that LBS as well.