A chain hook keeps the chain tidy when the bike is folded, also protecting the bike from scratches caused by chain slaps when folding and unfolding the bike.
A chain tensioner helps to keep the chain at the right tension. It is specially useful in bikes without a rear derailleur providing tension in conjunction with oval chainrings.
| P/N | Function | Compatibility | Body material | Weight | Colors |
| HCT2 | Chain tensioner | Bikes with a single rear sprocket with 1x or 2x chainrings. Dahon bikes | CNC alloy | 100 g | black and silver |