At 620g complete, the longer option is light for its stroke too. While the 310mm collar-to-base measurement means it may not fit in some curved or weld-affected seat tubes, that’s a common issue.
The lever can be set at lots of different angles and the latest version has polished detailing on the length/leverage-adjustable paddle. It can be integrated with SRAM or Shimano brake levers too, with a £20 adaptor.
The lever is adjustable and can be integrated with SRAM or Shimano brake levers tooMick Kirkman / Immediate Media
While clamping the cable at the lever end theoretically makes set-up simpler, a loose fit at the post end means you have to keep things tensioned while installing/adjusting to stop the outer falling out of place.
The air spring is so progressive that dropping the saddle requires a lot of force, even at minimal pressure (40psi). Setting accurate cable tension for the hair-trigger release is crucial too, but the mechanical ‘Helix’ brake still doesn’t always lock into place, causing a gruesome grinding noise if it slips.
After air-seal issues on my first post and bursting my second sample (due to the “inflate to 100psi” directions in older instructions), my third Helix is faring better, although it’s too early to vouch for its long-term reliability.