I have Tubus Cargo (100lbs) Rear (weight carrying capacity)
Tara ( 33lbs) Front " " "
Use with Ortlieb Roller Classics Front & Rear which are a perfect match
Observations: Light weight, very strong, stable, and durable. (One word sums it up solid)
Cargo- has a wider width on the top, in the rear, and a place for a Busch Muller rear light. (50 & 80mm)
Tara-has hardware 2 attach a kickstand works in conjunction with a rear kickstand attached 2 chainstay*
Tara- has a loop/bridge to connect 2 racks.**
*Robenne pointed this out, uses it on his Comotion, and appears to work well.
** Tubus believes that the loop/bridge helps with balance and stability.
I wish Tubus made a piece that attached to the loop/bridge and secured, on the other end, around the frame, so I could put my sleeping bag on it. (May have to engineer one)
I thought you might appreciate the below:
Rack Type Weight Capacity Material
Tubus Airy Rear 230 g 30 kg Titanium
Tubus Cargo Rear 625 g 40 kg 25CrMo4
Tubus Carry Rear 350 g 30 kg Titanium
Tubus Cosmo Rear 680 g 40 kg Stainless Steel
Tubus Disco Rear 658 g 20 kg 25CrMo4
Tubus Fly Rear 330 g 18 kg 25CrMo4
Tubus Logo Rear 730 g 40 kg 25CrMo4
Tubus Locc Rear 1050 g 40 kg 25CrMo4
Tubus Vega Rear 510 g 25 kg 25CrMo4
RackTime FoldIt Rear 700 g 25 kg Aluminum
RackTime AddIt Rear 733 g 30 kg Aluminum
Tubus Duo Front 510 g 15 kg 25CrMo4
Tubus Ergo Front 570 g 15 kg 25CrMo4
Tubus Nova Front 535 g 15 kg Stainles Steel
Tubus Tara Front 500 g 15 kg 25CrMo4
Some notes on rack materials (supplied from this source):
Aluminum is stiff, lightweight and cannot be welded. An extra stiff rack can be unforgiving on the rider when biking over potholes or rough dirt roads with a full load. If the tubes are bent, structured integrity can be compromised, vastly reducing the weight capacity.
I have had Blackburn alumium racks and I did have a break, on the front rack where it attached to the fork. Never had a broken a rear rack.