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I'd like to carry 20 - 40 pounds or so in panniers on my rear rack. I've carried that much on my hard tail so it's not a problem for the biking itself.
The cantilevered rack style that is supported only on the seatpost is a non starter. I have a carbon fiber seat post. It can't hold more than 10 pounds (even that worries me)
I recommend against doing this. You will be dramatically increasing your unsprung mass, which will play hell with your suspension's dynamics. You might want to consider a trailer instead, or see if you can carry the load in a frame bag and/or seat bag.
What you'd need is something that:
- only attaches to the seatstay (top of the swing arm)
- attaches to a rear dropout screw eye, mounting point (not sure what it's called) if there is one and the seatstay
And, won't hit the seat when the swing arm moves.
Thule Tour rack (not a recommendation - I've never seen or used this device) is advertised as something that will work for full suspension bikes and only attaches to the seatstay Load capacity 25 pounds on the rear.
Other racks attach to the rear axle and the top of the swing arm - some are held on by the quick release. Skewers seem too fragile in my mind.
I wonder how the ride would change with 25 extra pounds attached to the swingarm.
