Actually, those are the ratings provided by Nitto.  They are notoriously 
conservative. I think Grant wrote about that on a number of occasions.  

To (probably mis-)paraphrase, they derive that weight from a set of testing 
cycles that far surpass anything anyone is going to subject it to in the 
real world.

I stand by my direct experience on the Mark's Rack (as well as the 
Mini-Front (mid-fork, single-pole-into-crown mount)).  They are plenty 
sturdy.

- Jim / cyclofiend.com

On Thursday, October 3, 2013 8:08:43 PM UTC-7, Daniel D. wrote:
>
> Can't be that strong, according to the riv site it's rated for  only 4.4 
> pounds.

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