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.

Corrosion resistant, completely encased and protected against dust and spray water.

Two different models are available:
speed-drive model 08: exchangeable chainrings (made of hardened steel) with 27, 28, 30, 32, 34, 36, 38, 40, 42t., hold by a circlip
speed-drive BCD110: 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 53t. (34 - 42t. made of hardened steel, 44 - 53 aluminum). Chainrings with 5 holes and bolt circle diameter (BCD) 110mm

Please notice: if you want to use standard BCD110-chainrings, the inner diameter has to be turned out to 96mm (instead of 94mm of standard chainrings).

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.

Standard is 138mm for bottom bracket widths of 68- 73mm.

The speed-drive unit is designed for an inner diameter of the bottom bracket shell of 33.6 - 34.5mm. The speed-drive part, which is slid into the b.b., has no thread. It is perfectly centered by conical rings. The bottom bracket has to be chamfered on both sides at 45°.

Distance between centerline of frame and midth of chain: 42, 44 or 49mm. For 42mm, please ask for 2mm spacers, which can be set between spider and chainring. The chainring can be fitted at the outer side of the spider (-> chainline 49mm) without a special spider (the speed-drive spider is part of the steel gearing house).

Generally, you can combine any bicycle gearing system with speed-drive.
For heavy use such as for Long Johns, rikschas, tandems, please use hubs, which are designed for tandems. These are 3- and 5-speed - SRAM - hubs. With 7-speed-hubs from SRAM, Shimano hubs and all types of chain derailleur systems no problems have been reported in the past couple of years, when thousands of speed-drive - systems have been combined with many different gearing systems.
You can combine speed-drive with the Rohloff 14-speed hub.
All speed-drive - systems may be combined with coaster brakes.

Crankarms sit conventionally on square spindle sections.
Standard length is 170mm
Material: aluminum
Available as an accessory are the following cranks: 155mm (straight shape), 160, 165, 170, 172.5 and 175 (all off-set shape. Other sizes on request.
For the standard straight 170mm crank, "easy-shift" - levers are available, which are simply clamped between pedal and crankarm and can be retrofitted to any
speed-drive.

Chainrings

speed-drive model 08: 27, 28, 30, 32, 34, 36, 38, 40, 42t.
speed-drive BCD110: 34, 36, 38, 40, 42, 44, 46, 48, 50, 52, 53t.

<- speed-drive model 08

We offer high quality aluminum trouser guards for all chainring sizes.
 

 <- trouser guard for 27-tooth chainring.

Including spindle, bearings and spider, excluding chainring and cranks: 790g (46 tooth chainring with chainring bolts: 90g, cranks 220g 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

High quality planetary gearing systems have efficiencies of about 95 - 97%. By using only the best technology for gears, bearings and lubrication, we try to get to the highest possible level. The possibility to easily lubricate the speed-drive gearing system guarantees to keep this high level for lifetime.

speed-drive can be used for tandems.

The speed-drive unit comes ready for installation, including chainring of your choice (extra charge for chainrings larger than 48 teeth), both crankarms, detailled installation instructions.