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Brompton crankset with 50T "spider" chainwheel Maximize

Brompton crankset with 50T "spider" chainwheel

50T Brompton crank set (left and right complete) - the "new" 2013 "spider" Brompton crankset

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4 Items in stock


The Brompton "Spider" crankset was introduced on new Brompton bicycles at the beginning of 2013. In 2015 it was introduced to the after-sales market, allowing us to offer it to you.

This is a replacement 50 tooth crank set complete with left and right hand crank - bottom bracket is NOT included and if you are upgrading from the old fixed crankset then you will also need to change the bottom bracket (the old one was ISO standard and the new one is JIS standard)

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

  • The chainring protector is held on with screws rather than plastic lugs so is less liable to falling off
  • The chainring can be changed without the need to replace the crank as well (making it easier to change gear ratio) 
  • Better protection of folding pedal (a hook on the back of the crank arm stops the pedal folding in too much) to help prevent it from scratching the frame (though the pedal should be unfolded first and folded last in the folding sequence to prevent frame scratches
  • It looks better too! 

The pack contains the following:
Left hand crank and bolt
Right hand crank with 50T chainring and chainguard and crank bolt 

Crank length 170mm
Brompton logo on cranks 

A standard 3 or 6 speed Brompton comes with this 50 tooth front chain ring

Brompton Q part code: QCRANKSET-SPI-50
Brompton part number: 9020140

Review(s) for Brompton crankset with 50T "spider" chainwheel

Reviewed by: Ajay G

Review Title: Good product, great service

Bought as part of a drive train replacement for my 2007 Brompton, the bike is running great now, awesome service from Brilliant Bikes who did the fitting.

    Reviewed by: Alex

    Review Title: Amazing service

    Had a major failure of my older fixed crankset on the way to the station this morning - the crank sheared completely from the chainwheel. Took the bike to Brilliant Bikes at 9am and it was repaired by 1030. That's Brilliant service! Thanks!

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      Brompton crankset with 50T "spider" chainwheel

      Brompton crankset with 50T "spider" chainwheel

      50T Brompton crank set (left and right complete) - the "new" 2013 "spider" Brompton crankset

      Rate the item and Write your review