No Rocket Surgeon
Join Date: Jan 2005
Location: Corona and S. El Monte, CA
Bikes: Cannondale D600, Dahon Speed T7
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1: So that's an extra 20 kg (44#) or so on two racks, hanging off the seat post. Depending on how much you weigh, I can't see it being a big deal. Seatposts for folders are pretty stout.
I have a Dahon Speed 7. It's very comparable to your Giant Halfway. The actual calculation would be a bit more complex, but here's a quick and dirty approximation to consider. I weigh 230# (104kg) and have no problems with seatpost flexing on my Dahon. As long as you weigh less than 186#(84 kg) , you should be OK.
You just have to consider that you have a lot more unsprung weight on the bike. You may have to alter your riding style somewhat. For example, I would handle my bike differently if it was unloaded vs. whether it was fully loaded for touring.
Fewer Cars, more handlebars!