Brompton Gearing

To Contact Us If you have problems contacting me on the below number please try my alternative number 07923 425979

For the current mooring location or to make an appointment for the land base workshop please Phone 07749 824784

Unit 2 Stockton Hall Farm, Rugby Road, Stockton Warwickshire CV47 8HS. Email graham@tillercycles.co.uk

8 Speed Conversion Kit (Sturmey Archer)

Our 8 speed conversion available as a kit (all parts as in above description) with full fitting instructions and free check-up/fitting (at my workshop) should you need it. £284.99 inc. U.K p&p ( with either Mk 4 rim or the new twin wall rim)

With Brompton introducing a new wheel rim (2013) this kit is now built to order for your specific model including building into your Mk2 rim if you wish and supplying 1/8 chain for older models using 1/8 chainrings, please also note older handlebars of 24mm diameter will (and should be) changed to the 22.2mm, please email me your requirements , waiting list currently running at 4 weeks.

Special price of £36 to build a matching front wheel if you choose the new Brompton double wall rim for the kit, simply send me your hub.

Standard Brompton 3/32 chainwheels

Standard 44t, 50t and 54t for service replacement or to tune your current gear set-up, can also be supplied with the replacement alloy chainguard (please see previous page for details) pre fitted. U.K. P&p £1.95, overseas customers please email for costs.

Brompton 8 Speed conversion

We can fit the new Sturmey Archer 8 speed hub to your Brompton to give the ease of 8 evenly spaced gears with the simple twist grip gear change.

Suitable for M/P/S/H-type bars and

it retains your Brompton chainwheel

gear ratios are:

325%

With 44t chainwheel 2.30m - 7.50m

With 50t chainwheel 2.65m - 8.60m

With 54t chainwheel 2.85m - 9.25m

Or with lower gear options (details below)

With 40t chainwheel 2.08m - 6.75m

With 39t chainwheel 2.03m - 6.60m

Fitted to your Brompton the cost is £284.99 including new rim, hub and wheel build using new Sapim spokes, chain tensioner with mods, chain, gear control, grips and Free Scuff Muffle!.

Click here for Brompton 8 speed for sale

Also available as a kit please see below

Lower gearing for all Bromptons (1,2,3,6, 8 and 11 speed)

This is probably the most asked question I get about the Brompton bike, if you have got the smallest Brompton chainring (44t - standard Brompton chainrings also available below) and the largest rear sprocket for your model and you still want lower gears then I can supply (and fit if required) two new options, Stronglight 40t and Alfine 39t.

Stronglight 40t chainset, a smaller chainset by the manufacturers of the Brompton chainrings, the right crank arm is the same style as the current Brompton so you can either retain your left crank with the Brompton modification to stop the folding pedal touching the frame or fit the new one supplied with a modification to do the same. It will use your current bottom bracket cartridge. Supplied with a bespoke laser cut polished aluminium chainguard £49.99. U.K p&p £1.95 , overseas customers please email for costs.

Shimano Alfine 39t chainset with chainguard, giving the lowest gear and upgrading to outboard bottom bracket bearings (included), the left crank arm has been modified to retain a pedal stop function, £89.99. U.K p&p £1.95, overseas customers please email for costs.

Nb. not suitable on 11 speed conversion.

Brompton 11 Speed conversion

Fitting the Alfine 11 speed hub to your Brompton requires the widening of the rear frame (steel), with my jig this is done cold which avoids any paintwork damage, all the other mods are done to retain a Brompton look, rim options including pre 2013 style and newer double wall rims available, suitable for M/P/S/H- type handlebars (M/P/H- types need a little adjustment of bars - something many Brompton owners already do to get a more comfortable brake lever angle - to allow for the bulkier gear shifter so will increase the width of the folded bike slightly) it retains your Brompton chainring, gear ratios are:

409%

With 44t chainwheel 1.67m - 6.86m

With 50t chainwheel 1.91m - 7.98m

With 54t chainwheel 2.07m - 8.62m

Or with lower gear options (details below)

With 40t chainwheel 1.52m - 6.38m

Fitted to your Brompton the costs start at £774.99 including new rim, hub and wheel build using new Sapim spokes, chain tensioner with mods, chain, gear control,Shimano brake levers, grips and Free Scuff Muffle!

Click here for new 11 speed bike for sale

This conversion is currently for steel frames only (new frame can be supplied if needed), until I try the titanium option in the near future. This will be a to order package, for fitting at the workshop, please contact me to place a non deposit order for the next conversion available. Alfine 8 speed conversions also available from £475

Project X-TC

Well if Brompton can have a Project X with their e.brompton project why can’t I, it’s not an electric version which sadly has given Brompton headaches for many years, but another gear system that could give a 500%!! gear range for a very reasonable cost, it’s all hush-hush so please don’t ask... If it works you will be the first to know via this page...

...update..........it was looking good but I now know I will have to make a completely new chain tensioner, so until I get my CNC milling machine this conversion is on hold

Wheel upgrades

Brompton wheel building using your hubs to upgrade to the new Brompton double wall rim or Velocity Aeroheat rims.

Front wheel build using your hub (standard) with new spokes and Brompton rim £43

Rear wheel build using your hub (standard gear hub) with new spokes and Brompton rim £49

Extra light options and Velocity rims please email for quote