Front suspension on a cyclocross bike? Is there a reason why no companies are manufacturing front suspension for cx bikes? 


Is it limited by the UCI rules?
Would weight mean it would offer no additional value?


I would like to know if a light weight, low travel (&lt;80mm), skinny stanchion (&lt;28mm) would make any difference to speed when off-roading. Comfort wise I imagine the difference would be huge. 

I have seen a picture of Lemond racing with a Rockshox fork so definitely been thought of in the past for road bikes.
Cyclocross courses are (generally) too smooth and relatively fast to warrant the use of suspension. Sure, it might be more comfortable, but the added weight would only slow you down and leave you behind  your competitors on a typical muddy course.