silkishuge wrote:G'day,
I have a Topeak MTX one but I find that is too restrictive because of its weight limit. I recall it was 5 kg or around that weight..... I guess it is limited because it is only supported by a seat post clamp.
Does the bike has mounting lugs on the seat stays and rear axle ? If not, you might need to check the weight bearing capability of the bike, then look at the Tubus clamps and racks. Tubus have QR-skewer mounts, but they're tailor-made for their (expensive) racks - fitting others like Topeaks won't work.
The MTX racks are good for 9 kg. Not too many people need or would lug 9 kg on and off the buses/trains/cars etc.,. The bike spares plus bag weight will probably take out 1.5 to 2 kg. Should be plenty of payload left for lunch, workclothes, rainwear and even a light laptop (although why you'd need to cart one with the size of flash disks now ???).
If the bike has rack mounts on the frame, a pannier would get the weight down lower, be easier to pack (less crushing) and give you improved stability. I've found a Toppeak Tubular Rack with extensions for disk mounts worked really well on my MTB, and got some cheap Tioga waterproof panniers from Anaconda (around $120 for a pair on special, probably deleted items now) that also have been real good value.
Cheers