Originally Posted by
Mr IGH
Seat tube length isn't my critical dimension, I am more interested in effective top tube length, reach and stack. At 6"-3", a 58cm frame with level top tube might be too short on the stack and reach. What is the ett length of your caad? What is the seat tube angle compared of your CAD? Is the top tube level on a caad?
Good point. I guess was thinking more about seat to bar drop but lots of factors go into this.
The caad has a basically level and straight top tube. On my 58 cm bike the measurements are:
Top tube - 57.5 cm
Seat tube angle - 73 deg
Head tube angle - 73.5 deg
Head tube length - 17.5 cm
For the 58 and 60cm Stanyan the measurements (respectively) are
Top tube - 57.5 cm and 59 cm
Seat tube angle - 73 deg (both)
Head tube angle - 73.5 deg (both)
Head tube length - 13.7 cm and 15.7 cm
So you can see my concern. In a 58, both bikes have the same top tube and angles but the head tube is 4 cm shorter on the Stanyan. If I bump up to a 60 the head tube is still 2 cm shorter and the top tube 1.5 cm longer. Either way I look at this, the Stanyan is going to need more spacers to be equal to my caad which is already a more agressive riding bike than I want for a commuter. Lots of spacers and riser stem seem the only solution unless I'm really not understanding something about bike size and geometry.