The Specialized crankset uses the patent from Lightning. Lightning will soon be introducing its crankset, available in standard BB sizes. It should be compatible with Quarq.








Lightning Carbon Crank

KEY FEATURES:

* Weight: 580 grams with 34x50 chainrings
* Length: 165 mm, 170 mm, 172.5 mm, 175 mm, 180 mm.
* Increased Strength & Stiffness to conventional
* Adaptability: Standard Road & ATB Bottom Bracket shells with BSA (English) threads, 68mm (double), 70 or 73mm (triple)
* Spyder sizes: 110, 130, and 74MTB double; 64x104 and 74x130 triple.
* Q factor:149mm (double), 162mm (triple)
* 250 pounds rider weight limit
* Patent awarded

http://www.lightningbikes.com/Cranks%20of%20Carbon.htm

Technical discussion of center clamp cranks (eg Campy, Specialized, Lightning)
http://pardo.net/bike/pic/fail-005/000.html#lightning