The ultimate in Practical and minimal gears and braking!
Another piece of engineering from the past being given a new lease of relevance in the modern world of cycling!
What's so good? The Duomatic Hub has two gears but the real magic is that there is no gear shifter needed or any cables! Simply change gear by momentarily 'kicking back' whilst pedalling. A high polish alloy hub shell completes the wizardry.
At present only available with the drum brake - but there is absolutely nothing wrong with that. The S2 Duomatic hub (minus drum brake) will be available late this year...
Due sometime in August.....Want to pre-order? Call us on 01253 739680 and avoid the scrummage! Price to be confirmed.
• Overall Range - 138%
• Gear 1 - 100% Direct Drive
• Gear 2 - 138% (+)38% (Gear 1 + 38%)
More info available on the Sturmey Website
Specs for 130mm OLD
• Hub Shell Material - 6061 Aluminum
• Axle Diameter - 13/32" Slotted
• Axle Length - 175mm
• Over Locknut Dimension - 130mm
• Right Axle Protrusion Length - 24mm
• Left Axle Protrusion Length - 21mm
• Spoke Holes - 36
• Pitch Circle Diameter - 89.4mm
• Flange Width - 58mm
• Spoke Compatibility - 13g or 14g
• Sprocket Teeth - 13T through 22T
• Chain Line: 1/8" Flat 51.1mm
• Chain Line: 1/8" Dished 49.5mm, 52.9mm
• Chain Line: 3/32" Flat 50.8mm, 51.4mm
• Chain Line: 3/32" Dished 49mm, 53.2mm
• Indicator Chain - HSA585 Mark Yellow
Gear Ratio
• Overall Range - 256%
• Gear 1 - 62.5% (-)37.5%
• Gear 2 - 75% (-)25% (Gear 1 + 20%)
• Gear 3 - 100% Direct Drive (Gear 2 + 33%)
• Gear 4 - 133.3% (+)33.3% (Gear 3 + 33%)
• Gear 5 - 160% (+)60% (Gear 4 + 20%)
The original XRK8 has been redesigned to cope with the rigours or hard riding in wet, off road and with bigger loads. Ideal for building a low maintenence cargo bike wheel (eg Big Dummy, Xtracycle).
- 185mm axle length Rotary gear selector with no protrusions outside of frame
- Direct drive in 1st gear allows use of smaller chainwheels
- Quick and easy gear change with low change load
- High polish hubshell
- Fittings, cog and twistgrip supplied
Specifications for 185mm Axle
- Hub Shell Material - 6061 Aluminum
- Axle Diameter - 13/32" Slotted
- Over Locknut Dimension - 135mm
- Right Axle Protrusion Length - 26mm
- Left Axle Protrusion Length - 24mm
- Spoke Holes - 36
- Pitch Circle Diameter - 89.8mm
- Flange Width - 55mm
- Spoke Compatibility - 13g or 14g
- Sprocket Teeth - 20, 23, or 25 tooth Chain Line 1/8" Dished - 44.5mm Chain Line 3/32" Flat - 48mm Chain Line 3/32" Dished - 45.3mm
Gear ratio:
- Overall Range - 325%
- Gear 1 - 100% (Direct Drive)
- Gear 2 - 130% (Gear 1 + 30%)
- Gear 3 - 148% (Gear 2 + 14%)
- Gear 4 - 169% (Gear 3 + 14%)
- Gear 5 - 192% (Gear 4 + 14%)
- Gear 6 - 220% (Gear 5 + 14%)
- Gear 7 - 250% (Gear 6 + 14%)
- Gear 8 - 325% (Gear 7 + 30%)
.JPG)
Sometimes we want to fit a hub into a frame dropout that is just a little too wide. The answer is to use a spacer to 'pad out' that space. Be careful about your chainline though!....
Suitable for 1mm diameter axles.
Spacer widths - 0.5mm, 1.0mm & 5.0mm
Priced per spacer
