It's a steel frame? Really? It must be heavy. The bike this frame is copied from, the Dahon MU, has an aluminum frame that's not particularly light. Copied in steel it would weigh ~3x as much.
Most
folding pedals are lower quality. Suggest removable pedals: MKS Ezy, Wellgo QRD, etc.
Yes, a few folks use drop bars on their folding bike. No, they typically don't fold well.
Use a regular X-speed cassette hub, one cog and a bunch of spacers. Any chainline you want, bob's your uncle.
Originally Posted by
Duragrouch
+1. Probably also easier to find replacement freehub body, and replace cog when needed, than freewheel body with fixed cog or that allows cog replacement. Only question, if not using narrow chain and typical cassette cogs, but rather, wider single-speed cog and crankset, is if they make wider tooth cogs like that to fit on a standard pattern cassette body? But if using standard multispeed chain, not an issue.
yeah, it’s steel. And it is heavy…just under 4kg.😂 with regard to the chain line: I did some research and found that surly makes a 135mm rear single speed hub with a chain line of 50mm. When I use an old campa square taper crank with the campa chorus 102mm spindle bb (which produces a chain line of 48mm) or a JIS 107mm bb and mount the outer chainring it should be near perfect…the real problem is this gnarly fluted seat tube. I think I am going to make some vertical cuts on the seat tube, bend the fluted part outwards and braze a seat post clamp onto the outside, thus getting a seat tube which accepts a 33.9mm seat post. Seat posts with 33.9mm diameter and 600mm length are much easier to source…