Brompton 8-Speed Kit

Brompton 8-Speed KitThe Kinetics 8-speed Brompton conversion uses a Sturmey Archer hub gear with a very wide range – the X-RF8(W) has a 325% gear range*. Compared to Brompton’s 6-speed option, it is a wider gear range with only one gear shifter – a low profile twist shifter. All 8 gears are in sequence, so it’s easier to use than the 6-speed’s twin-shifter system, and any gear can be selected while stationary. The smaller front chainset keeps the drivetrain further inside the folded package. No modification of the frame is needed.

I can fit the 8-speed to an existing Brompton for you, or I can send you a kit. The kit includes the complete back wheel, chain tensioner, gear shifter and cable, and replacement chainset. You’ll need a few spanners, and a few allen keys – fitting is not hard, and takes about 30 minutes (see the instructions here).

Brompton 8-spd Kit – £395 Add to your basket – delivery takes 2 weeks

Thumbshifter instead of twist – £25 Add to your basket

*I normally use a 20t rear cog and 33t front chainring, to give ratios of about 29″ to 95″ (2.3m to 7.5m).

38 Responses

  1. kang says:

    i have a 3 speed brompton.
    i can use 8 speed kit?

  2. Josh says:

    This can be fitted in a carbon wheel (ORZ, etc…) instead of a regular wheel?

  3. Petr says:

    what is the weight difference in comparison to the standard 6-speed (3-speed hub + derailleur) setup?


  4. christine leccia says:

    J have a 2 speed, light titanium version, 2012 I would know if the dimension is correct without modification of the frame.?
    could you tell me the dimension for my bike shop in France for installation
    thanks you

  5. Mark says:

    Can you offer this kit with 30t front chainring and new chain to fit?
    Thank You.

  6. Mike Hislop says:

    I just acquired a 2 speed S model. Would this be the genesis of a 16 speed, or is that just silly?

  7. I’m glad to find this before ordering my first Brompton. Needn’t bother with any of their gearing options now, none of which appealed to me. Gear range appears to be comparable to my current Sachs Super-7 bike (31.8″ to 96.5″), and I use all seven.

  8. Will this work with a single-speed Brompton?

  9. John says:

    What is thje over locknut distance distance of the hub you use ?
    Is it the standard 120mm of the standard X-RF8(W) hub that requires a slight widening of the Brompton rear triangle or do you reduce the hub over locknut distance distance to 110mm ?

  10. Francis says:

    Hi, do you ship to Canada? Will The local Brompton retailler Know How to install it?

  11. Bo says:

    I have a 6 speed brompton. If I buy the kit, is there anything else I need to install it?

    • admin says:

      Depending on the age of your chain, you might need a new one.

      • Bo says:

        I got your 8-speed SA kit very quickly (very fast shipping to the USA) and I had the bike shop DIAMOND CYCLE in Monclair New Jersey install it (which they did in a day). I love this setup over the dual shifter 6-speed and I can more easily take on hills with the lower overall gearing.

  12. Michael says:

    I have a 6 speed if I put this kit on will this make it a 16 if I use the derailleur with ?

  13. Daniel says:

    Does the kit come with a 20 cog?

  14. Jan says:

    How much weight does the 8 speed
    kit add to a 2017 M2L?

  15. rhpj says:

    can you fit a smaller chainset than the 33t to make the gearing smaller?

    • admin says:

      Suitable chainsets are quite hard to find – in theory it’s possible to go down to about 30t without causing problems, any lower and the chain hits the wire cable loop on the chainstay.

  16. Andrea says:

    What is the metres of development?

  17. Kevin says:

    I’m interested in the 8gear conversion, How would it work on a P-type handle bar?

    • admin says:

      The twist shifter works pretty well on a P-type, unless you’ve got the older plastic brake levers – in that case, the thumbshifter is probably better.

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