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Brompton crankset with 44T "spider" chainwheel View larger

Brompton crankset with 44T spider chainring



44 tooth Brompton crank set - silver

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Brompton 44T spider crank set

This is a replacement 44 tooth Brompton crank set complete with both left and right hand crank, chainring and crank bolts - packaged in a nice box

Note: The bottom bracket is NOT included and if you are upgrading from the old fixed crankset then this should also be changed

Why is the bottom bracket important?

The older Brompton chain sets used a square taper bottom bracket with a fitting known as ISO - International Standards Organisation

The newer spider chain set still uses a square taper bottom bracket but it's slightly different! The spider chain set uses a JIS - Japanese International Standard - bottom bracket

JIS has become pretty much the standard due to the dominance of Shimano in the bicycle component market

The new Brompton "Spider" crankset was introduced on new Brompton bicycles at the beginning of 2013.

In 2015 it was also made available to the after-sales market (i.e. as an upgrade to older bikes - it is compatible with all Brompton bicycles)

The "spider" crankset has a few advantages over the older fixed crankset:

The chainring protector:

The chainring protector is a plastic guard and stops your trousers / long skirt from rubbing against the potentially dirty / greasy chainring.

This is now held on with screws rather than plastic lugs (which is how the older version was held on). This means it is less liable to falling off, and easier to replace if necessary.

The chainring:

The chainring is the big cog / sprocket at the front which you push around with the pedals to power the bike

With the new spider chain set, the chain ring can now be changed without the need to replace the crank as well 

This chainring is held on with five chainring bolts

This means you need to change less if:
1/ You wear out the chainring and need to replace it (over time it will wear out)
2/ You want to change the gearing of your bike (moving to this 44 tooth chainring from a 50 tooth one for example will reduce the gearing and make it easier to climb hills)
3/ Fashion dictates that you want to change from silver to black!

The cranks:

The cranks are the connector between the bottom bracket and the pedals

The spider cranks have better protection of folding pedal to stop it scratching the frame. There is a notch on the back of each crank, preventing the folding pedal from going back too far and scratching the frame.

Crank length 170mm
Brompton logo on cranks 

A standard 3 or 6 speed Brompton comes with a 50 tooth front chain ring - changing to 44 teeth will reduce the gearing by approx 14%

Tools required:

For old crankset (pre-spider version) removal:
Crank bolt wrench - CCW-5, to remove the crank bolts
Crank puller - CCP-22, to remove the cranks from the bottom bracket
Bottom bracket removal tool - BBT-4 for FAG style or BBT-22 for Shimano style

For newer crankset (spider version) removal:
8MM allen key, to remove the crank bolts
Crank puller - CCP-22, to remove the cranks from the bottom bracket

For crankset installation:
8mm allen key, to fix the cranks

Note: If you are changing gearing, then you will also need to change the chain size and will need a new chain or a chain tool to do that

Brompton 2020 Q part reference: Q101394
Brompton Q part code: QCRANKSET-SPI-44
Brompton part number: 9020133



Going uphill the easy way

Just fitted this item today at brilliant bike and I must say that my old Brompton rides far more better than ever before and going up an incline requires less effort ! Combined with a new sprocket and chain this is undoubtedly the best - genuine parts - modification for the worlds best folding bike .

Thanks to brilliant bikes


    Brompton upgrade.

    Needing a new chain and replacement 13/16T rear sprockets for my Brompton, I decided to go the whole way and replace the standard one-piece chainset with a 44T "spider" crankset (and the required JIS 119mm bottom bracket). The whole upgrade took less than 90 minutes to effect, and the improvement is truly remarkable. I've never taken much notice of the flex that occurs in the basic one-piece chainset and certainly never known the crank and chainwheel to part company, but the greater rigidity and smooth chain-run achieved by the new chainset is incredible. The total upgrade may be rather expensive (although Brilliant Bikes' prices are the best around), but the future savings when only a new chain-ring will be required will be significant. Well done Brompton! Well done Brilliant Bikes!

    • 1 out of 1 people found this review useful.

    Great Upgrade

    Recently bought the improved 2013 crankset to replace the old model from 2011 which is a vast improvement even the chain guard is screwed on now. If you are carrying out this retrofit upgrade don't forget to replace your chain and sprockets at the same time or you may experience a nasty jumping sensation while pedalling


      Good to see them available again

      Great to see these available again after a long absence. My wife wanted to reduce the gearing on her bike and I have been waiting a while to be able to fit one of these new "Spider"types rather than the old style. Meant changing the bottom bracket as well but worth it as these are stiffer and seem to be more positive that the old ones, also as a bonus they look better in my view. And as always top class service from Brilliant Bikes.

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        Brompton crankset with 44T spider chainring

        Brompton crankset with 44T spider chainring

        44 tooth Brompton crank set - silver

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        3 Question(s) answered - see below

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          Answered questions

        • Asked by Duncan
          on 21/01/2019
          Hi, I have (I think) a really simple question - but can't find the answer anywhere: what is the chainline on a post-2013 Brompton with the spider crankset and the standard JIS 119 mm bottom bracket? Answer:
        • Asked by Kari Jalkanen
          on 29/07/2019
          Hello, I'm interested to know how much the Brompton 44T spider chainring crankset weights? Answer:
        • Asked by SR
          on 30/08/2019
          I have an old 5speed Brompton (it is marked as ‘SA95-9’ on the hub). If I upgrade to the 44t chainring, bottom bracket and chain, I would also change the single, rear 13t sprocket. Would I be able to change to a larger (say 16 or 18) sprocket? Would this be a reasonable possibility? Many thanks. SR Answer:
          Yes - generally if changing the chainring, it's a good idea to change the chain and rear sprocket. We don't have any sprockets that big, and haven't tried them - sorry - 14Y is the largest we have for the Brompton Sturmey Archer wheel

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