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Brompton derailleur chain tensioner idler (jockey wheel) bearings / fixings set - pair - showing kit contents View larger
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Brompton derailleur chain tensioner idler set

QCTIDLDRSET

Brompton

Brompton derailleur chain tensioner idler (jockey wheel) bearings / fixings set - pair - QCTIDLDRSET

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We have 29 in stock

£18.00

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Brompton derailleur wheels

The jockey wheels on the derailleur version of the Brompton chain tensioner are made of a durable nylon material

Over time these will wear and could help cause the chain to slip when under load (though in reality it's normally the chain / sprocket combination which is more likely to lead to slipping)

It is common (normal even) to replace the complete derailleur chain tensioner assembly - but it's possible to replace just the jockey wheels and associated components to save waste and some money

Compatibility

These derailleur chain tensioner idler wheels are compatible with the following Brompton folding bikes

  • Brompton 2-speed
  • Brompton Electric 2-speed
  • Brompton 6-speed
  • Brompton Electric 6-speed

i.e. Brompton folding bikes which use the proprietary chain pusher derailleur system and have two rear sprockets

What's in the pack?

This derailleur jockey wheel pack consists of the following items:

  • Pair of jockey wheels (idlers) for derailleur (2 or 6 speed) Brompton chain tensioners - 10 tooth
  • Bearings (pair - approx 19mm long with a diameter of 6mm
  • Fixing nut (approx 30mm long) and bolt (pair)
  • Washer (pair)
  • Dust cap (pair)

This set allows you to replace just the worn jockey wheels on a Brompton chain tensioner 

Tip: to keep your jockey wheels lasting longer (this applies to all drive chain components) - keep them clean from dirt / too much oil as this will cause them to wear quicker

Tools required: 

  • 2.5mm Allen key / hex wrench
  • 10mm spanner
  • small flat head / blade screwdriver


Brompton 2020 Q part code: Q101511
Brompton Q part code: QCTIDLDRSET
Brompton part number: 9023097  

 

Reviews

Grade 
11/04/2025

They don’t last long on dirty roads

I swap mine between the tensioner role and the gear change role. Only the gear change one gets worn down by grit between it and the chain pusher, so you can make a set last twice as long by swapping them.

    Grade 
    26/11/2018

    Does the job

    While a little disappointed to have to replace within the year after average mileage, change and spare part/s were at least not that expensive and Brompton is back to its best again. Thank you Mike and Brilliant Bikes again for great service.

    • 2 out of 2 people found this review useful.
    Grade 
    12/12/2016

    Brompton derailleur chain tensioner idler

    Fast and pleasant service

    • 3 out of 3 people found this review useful.

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    Brompton derailleur chain tensioner idler set

    Brompton derailleur chain tensioner idler set

    Brompton derailleur chain tensioner idler (jockey wheel) bearings / fixings set - pair - QCTIDLDRSET

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    Data sheet

    OriginUK
    Comm Code87149990