Need help with the size of a CAADX cross bike
I'm thinking on buying a CAADX 105
and I need help with the size of the bike (you can see geometry following the link).
First of all, these are my measures:
- 1,80 cm.
- Inseam length: 82,5 cm.
- Torso length: 66 cm.
- Arm length: 67 cm.
- Weight: 70 kg.
I currently own a Cannondale CAAD3 mountain bike, size M.
From my size, it seems I would need a road frame of 56, so a cross bike of 54 will fit me. It is my first non-mountainbike, so I don't have real references.
I went to a shop where they had the CX9 in 56, and it seemed giant to me. The top tube was just there 'in my parts'. So I'm almost sure that 56 is not my size: the seller said it will be more confortable for me, and that I should only buy the 54 if I intended to do some racing, but I think he was trying to clear stock...
I want the cross bike to replace my mountain bike in some forest tracks and occasionally to use it as road/touring bike. My mountain bike feels slow when I need to ride say 20 km on semi-decent roads to arrive to the forest tracks.
Then, today, I have found this sizing chart
from Ridley: it seems I would need a 52-54... but I don't understand how they measure the legsize...
So, what do you think?
Thanks in advance,