Please don’t flame me as I post my forward of the BB measurement. I just realized I’m WAY forward of the saddle tip. I just measured this for the first time. I’m 5.08cm in front of the BB. My stems are 130mm, I think. Could be a 120, though, I’m getting-old and can;t remember.
About 1.5 years ago I was fitted by the LBS, who did a great job, BTW. At that time my aerobars were at a drop of 17.5. We rasied the aerobars to a drop of about 10cm. This only raised my back about 2cm as I was curving my shoulders instead of flattening my back to reach the aerobars. Since then we have moved me more forward to lower my back without curving my shoulders and loosing hip angle. As I’ve moved forward the angle has stayed open and my back is much flatter, although not near as flat as some of you would like to see. I have many broken bones and compressed vertebra in my back, so my back has an arch to it in the aero position. I have very long legs (37") inseam and very long arms, with a very short torso, hence the 16cm drop without a dead flat back. Even at this position the Zipp 2001’s I have ride like a dream. No problems in handling at all. But I guess I’ve been riding them so low I don’t notice a twitchy ride.
So what angle does the 5.08cm compute to?
Thoughts…other then laughing please!!! : )