Brompton Spider Crankset - 50T QCRANKSET-SPI-50

Customer Reviews (1)
5 / 5| Write your review
£90.00 Please note this product has selling restrictions to your country. was
Manufacturer : 
SJS Cycles part number : 
Manufacturer part number : 
Replacement 50T spider chainset as found on post-2013 bikes.

Lightweight but strong construction.

Removable chainring - easy to replace when worn or change gear ratios.

Weight: 426g (Right) , 235g (Left) .

Uses a 119mm JIS bottom bracket.

Suitable for older, pre 2013, bikes but will require a replacement bottom bracket.
Please note Brompton have selling restrictions to some countries who have their own dealers. If you are unsure please contact our sales team.
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Product Reviews (1)
Overall Product Rating 5 / 5
Great original Brompton part
By Nick Watton
27 Dec 2018
5 / 5
I recommend this product
ConsNot easy, requires specialist tools
ProsGood upgrade for an older Brompton
Upgraded an older Brompton to this, which required a change in bottom bracket, a good few specialist tools, and a fair bit of effort. However, whilst a shop fitting would have cost the same as the tools, I get to keep the tools and have learned more about the bike, so definitely worth it!
Questions & Answers (2)
To use this to replace the crankset on a 2007 Brompton, which bottom bracket would I need?
28 May 2020
SJS Cycles part number : 31207 is the Brompton spec one, but you can use any 119mm JIS 68mm square taper.

Thanks - 28/05/20
Can I use an 1/8 inch chain?
11 Jun 2019
My brompton is a 6 speed with the SRAM rear hub (2007). I'd prefer to use an 1/8 inch chain to be that bit lighter. Will that work OK with this chainwheel?

Thank you. Charles Ferrar
(and I am aware of the change in bottom bracket)
This is a 3/32 chainwheel, modern Bromptons use 3/32, yours may well be 1/8 chain (but 1/8 is not lighter) a 1/8 chain will run on this chainset if you HAVE to use it because your hub sprocket is 1/8. If you are still in doubt email directly our expert ([email protected])