Typical Gear Ratios
Notes for 2008 Rollers
season's Rollers will be fitted with triple chain rings, a Campagnolo
Centaur front mechanism and a twist grip changer on the left hand bar as
standard. This arrangement provides a practical, light-weight and cost-effective
means of extending the already wide gear range when using the
DualDrive or Rohloff hub gears. If weight or cost is a consideration then
the Roller can be provided with either a single chain ring or a double chain
ring with manual change-over as fitted previously.
triple chain ring and 9-speed sprocket derailleur system can be also provided, but the range of gears will not be as wide as the options
As all Rollers are hand-built to order, we are happy to consider alternative gearing
arrangements to meet a customer's specific requirements - please call
you are new to cycle gearing then you may wish to know what the
various numbers shown in the tables below mean.
The figures on the
green background are usually shown on the gear shifter on the
refers to the number of driven gear teeth on the rear wheel.
"Chain ring or
C/R" refers to the number of driving teeth on the pedal crank.
and Hill" refer to the three positions of the thumb lever on the
DualDrive gear shifter. The numbers 1.362, 1.000 and 0.734 are
the internal gear ratios of the hub. The 14 internal ratios of
the Speedhub 14 are also shown, e.g. gear 11 is direct drive ratio of
(in this case 20) refers to the nominal diameter, in inches, of the
driven wheel of the Roller.
(the figures on a white background) refer to the diameter of a virtual
driven wheel obtained by the gearing. One revolution of the
pedals rotates the virtual wheel one revolution.
The calculation is:
inches = (chain ring teeth/sprocket teeth) x wheel size. When a
hub gear is used the resultant is further multiplied by the internal
gear ratio. The "gear inches" method of describing a cycle
gear ratio is mainly used in previously non-metric countries, and
stems from the days of the early machines when the pedals were
attached directly to the front driving wheel. The maximum gear
ratio then was limited by the length of the rider's legs.
is the ratio of the highest gear divided by the lowest gear.
SRAM DualDrive 3 x 9
The Roller is
normally available in nine standard RAL colours as follows:
Jet Black - RAL
Signal White -
Ruby Red - RAL 3003
Purple Red - RAL
Gentian Blue -
Deep Orange - RAL
Traffic Yellow -
Opal Green - RAL
Traffic Purple -
Other colours are
available to special order but will probably incur extra costs and
If you can't
collect your Roller trike we can arrange to ship the machine to
you. The trike is completely assembled, adjusted and
test-ridden. The wheels are then removed, the boom disconnected
and the chassis is split into two parts - these assemblies are packed
into two large boxes. A few hours of straight-forward
re-assembly is required - full instructions are provided. Please
contact us to discuss this option and the costs involved.
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Last updated: 24 June 2007