Sorry it took me so long to get back - I had to go find a new keyboard after seeing Pete's sketch while drinking a glass of water.
Originally Posted by Gravity Worx
As an XC rider (I'm assuming here, so please correct me if I'm wrong) you've ridden the single crowns primarily, and so your starting point is always fixed at the lower crown.
You know what they say about "assume?" Well, in this case, they're half right (not my half, either).