I’ve seen pictures of an odd bicycle seat that looks like a sling, sort of like a lawn chair. Do you know about these seats and whether they’re available?
You might be thinking of Pedersen bikes. Pedersen invented the ‘hammock saddle’ in the 1890s in an attempt to make cycling more comfortable. He redesigned the rest of the bicycle frame around his unusual saddle. They are quite popular even today.
You can find out more about Pedersens and see some examples here.
Answer Here’s a picture of the original sling saddle as built and ridden by the inventor and noted Dan Henry sling seatcyclist, Dan Henry. For a while this seat was sold as The Bummer, but, as far as I can tell, it’s no longer available. So my recommendation is to make your own. The construction is pretty straightforward and shouldn’t cost much. All you need is a stem and drop handlebars that fit together. You could use whatever’s available, maybe stuff purchased at a flea market or swap meet or even at the dump. Assemble the stem and the bar as shown in the photo and cut and sew some dungaree material or canvas or nylon webbing or what have you, to form the sling that slips over the flat portions of the handlebar. The tricky part will be making the stem fit inside the seat tube on the frame. You’ll probably have to shim it. There are many ways to do this. The cleanest is to get a piece of tubing and turn the outside and inside diameters down, the former to fit the frame and the latter