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  • Brompton Replacement Sprocket & Disc Set - 6 Speed 13/16T 9-Spline (5250502083)
  • Brompton Replacement Sprocket & Disc Set - 1 Speed 12T 9-Spline (5250502083)
  • Brompton Replacement Sprocket & Disc Set - 2 Speed 12/15T 9-Spline (5250502083)
  • Brompton Replacement Sprocket & Disc Set - 3 Speed 13T 3-Spline (5250502083)






We currently have 3 in stock.

Genuine Brompton Gear Sprocket & Disc Set. If you use your Brompton as much as we do, then sooner or later the rear cogs will wear out and will need replacing. This is what you'll need.  

Available in four variations to suit 1-speed, 2-speed, 3-speed, and 6-speed bikes, the cog sets all include a new plastic disc which prevents the chain falling between the cog and the spokes who misaligned and the necessary spacers and circlip.

If your Gear Sprockets needs replacing, then so does your chain. We recommend changing them at the same time to prevent slippage.

  • Genuine Brompton replacement part
  • 1 Speed - 12T (9-Spline) Sprocket & Disc
  • 2 Speed - 12/15T (9-Spline) Sprocket & Disc 
  • 3 speed - 13T (3-Spline) Sprocket & Disc
  • 6 speed - 13/16T (9-Spline) Sprocket & Disc
  • Supplied with guides, spacers and circlip required for installation
  • Suitable for Sturmey Archer and Brompton hubs only
  • When replacing the Sprocket & Disc set we recommend installing a New Bicycle Chain at the same time 
A BIT ABOUT BROMPTON: If you were to walk into the store and look at a Brompton we would say there are three things you should look for in a folding bike. All of them are fairly obvious. One, the bike should ride well - and, on a small wheeled bike that's tricky because there's a fine line between maneuverability (which is a virtue) and twitchiness (which is a vice). Two, the bike should fold well - otherwise you're blood pressure will rise and you'll curse the day you bought it. Third, it should be transportable, or highly storable - because that's the whole point, right?

Brompton is the only company we've seen that answers all three criteria - and believe us, we've tried every brand out there. The reason others can't compete is because Brompton has answered a fundamental engineering problem. If a bike is going to unfold to a large footprint (which takes the twitch out) then it is unfolding to a bigger bike - and by all logic, a bigger bike unfolded would be a bigger bike folded. So, it's pretty much true that for most folding bikes they either have great rideability but poor transportability or vice versa. And nearly all of them are a mess to fold.

Not Brompton. Brompton has designed the Platonic form of all folding bikes. The bike folds to the smallest size on the market, unfolds in a highly precise and easy manner, and has the same axle-to-axle footprint as a hybrid bike. How did they do this? By not only designing a clever frame, but also designing some 1200 proprietary parts that make everything fit - and fit perfectly. Oh, and nearly all of this is made in England. No wonder this bike has a cult following.


Canada: We use UPS, Purolator, Canpar or Canada Post within Canada. All applicable Provincial Taxes are charged at checkout. Orders may take 1-2 business days to process. A tracking number will be provided by email.

USA: We use UPS or Canada Post/USPS in the USA. No US or Canadian Tax is charged at checkout and all cross-border Fees and Duties are prepaid so there are no surprises. Orders may take 1-2 business days to process. A tracking number will be provided by email.

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