4 Speed
3 to 4 Speed Upgrade Kit (without chain)
3 to 4 speed upgrade kit (without chain)
If you already have a 3 speed set up that has room on the freehub for 1 more sprocket, and your chain is long enough for 1 more larger sprocket, then this kit is for you. If you cannot determine whether a longer chain is necessay, you can contact us, or select the upgrade pacakge with chain.
This kit will include the 4 speed compatible shifter internal and chain pusher parts, together with an additional sprocket and spacer. Longer tensioner pulley axles for factory chain tensioner are also included.
Updated Apr/2024:
There are now two choices for the left hand shifter conversion parts. Please refer to their respective pages for further details.
Post-2017 2 speed shifter,
P/T Line 4 speed shifter.
Prerequisites:
- Brompton post 2017 LH 2 speed shifter OR P/T 4 speed shifter
- Brompton Chain Pusher
- Brompton Spring Mechanism
- Any rear hub with lockring style freehub body and can accmmodate 4 or more sprockets.
If you are not using Brompton factory chain tensioner or aftermarket chain tensioners making use of factory pulleys, please contact the tensioner maker on whether the pulley axles can be extended.
Package Content:
- Shifter conversion parts,
- Chain pusher modification parts
- 18T or 19T Sprocket/spacer (Please choose)
- Longer tensioner pulley axles for factory pulleys
- Installation instructions for chain pusher & shifter parts
