Originally Posted by
tomtomtom123
I used a 5 mm Dynema rope. The steel cable was too stiff and really hard to work with. I wrapped the rope on both sides of the bottom bracket and a single loop around the head tube.
There is almost zero play in the hinge now. However because there are two strands in parallel on both sides of the bottom bracket, when folding the bike the rope has to lengthen initially.
Dyneema should be good, I'm pretty sure it's UHMWPE.
My loop is around bottom and top of non-drive (left) side of BB shell only. It has to go just a bit "over center" when unfolding but not bad at all. Having line on the drive side, yeah, that will be a lot harder to fold, and, it might be very close to your inner chainring. However, left side only like mine, the line can fall off over the left crank arm when folded, you'd need to watch that.
"Zero play in the hinge now"; People think I'm hyping or scamming them on this. It really works; "Lighter than air, stronger than steel, cheaper than dirt.
EDIT: Your bike, I'm liking what I'm seeing! Hollow crank with external bearings, 2X crank (looks like originally a 3X, with chainguard on the outside and 74mm BCD inner for great low gear). I don't see any front derailleur, I loved adding that to mine, especially if I occasionally drop a chain (if chainline is at cross-extremes when I front shift), shift to the other ring and the chain instantly pops back on. FD adapter was hard enough for my Speed frame, but on your style frame it may be more difficult, it's 1mm larger clamp diameter and the FD bracket attachment is further back:
Style on mine:
Style to fit yours:
