Is this course the same as Texasman? It's weird, their site says the TexasMan course is 24.1 while disco says 23 miles... yet I think the two maps are exactly the same.
http://www.dallasathletesracing.com/wp-content/uploads/TXMAN_Olympic_Bike.pdf
http://www.dallasathletesracing.com/wp-content/uploads/Disco2011_Olympic_bike2.pdf