Brompton New Non-Chamfer BB Shell Speed drive Gearing System (ATS)

In stock
Product Details
Brand: ATS
For Bike Type: Brompton
Origin: Taiwan
Item location: Taiwan
Status: In stock
Payment: Paypal, Credit Card
Ship to:: Worldwide (EMS)

A Gearing system to maximize your Brommie performance. (No more chamfering)

We know how you value your brommie, so BIKEgang has worked with ATS to present the newest 2015 version SPEED DRIVE with specially designed lock rings, no more chamfering on BB shell, and this means no more chamfering tool to buy or rent.

ATS - Speed drive is a gearing system that makes the chainring spinning at a higher rate. For instance, 38 tooth chainring with speed-drive engaged, will work like a 1.65 times larger one (63 tooth chainring). ATS Speed drive is manufactured under license of Schlumpf Innovations GmbH, (Switzerland) since 2005. All components are made in Taiwan and assembled in Taiwan.

Left crankarm with Brompton folding pedal anti-overfold block


(Chain driven version / Model SD165)

- Cone ring configuration, incl.

1. Black Gear Box

2. Bottom Bracket + Axle

3. Crankarms with Kickplates (Black or Silver)

4. Also include Chainring with chain guard. Please specify Colour choice and Size. 34T is recommended.

- With two gears: direct drive 1:1, overdrive 1:1.65 /165% (Model SD250 can overdrive to 250%)

- Axle length : 136mm, for bottom bracket width 67 - 73mm.

Weight:Including spindle, bearings and spider, excluding chainring and cranks: 790g

(46 tooth chainring with chainring bolts: 90g, cranks 180g each).

Please compare the total weight of speed-drive with the total weight of a triple

chainring set including shifter, cable, derailleur. Example: Shimano Altus

(48/38/28 teeth): weight incl. right crankarm: 1255g


  • Planetary gearing system with two switch positions: direct drive 1:1, overdrive 1:1.65
  • Direct shifting via push bttons or "easy-shift" - levers on both ends of the spindle. No cables, no rods.
  • Gear housing : Corrosion resistant, completely encased and protected against dust and spray water.
  • Axle: Rides on (replaceable) cartridge bearings. You can expect a lifetime of more than 20'000 miles for the bearings and much more for the speed-drive.
  • No chamfering on BB shell required.
!!! Special Note !!!
This MOD is not for casual rider, special tools are needed to perform this modification (BB and crank set removal and installation), unless you are an experienced technician, please consult local bikeshop for help. We are glad to provide all info and manual to help you go through the processes.

Please Drop us a line for manuals and tutorial, More info can be found at BIKEgang

About ATS
ATS, Fujiss Corp. is committed to giving consumer the ultimate quality and advance in transmission system parts. We focus on consumer's needs and satisfaction as the core of our company creed.
The ATS-Speed drive is innovative products by Mr. Florian Schlumpf. We are manufacturing under license of Schlumpf Innovations GmbH, (Switzerland) since 2005. We make this excellent bike gearing system in efficient production and inexpensive. We would like to let consumer have another choice to make their own bike more simple, clean (no shifting cable), easy riding or even enhance function of bike.
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