This product range comprises turned brass pulleys or sheave
wheels and specially made Chloroprene rubber (CR) drive belts.  
The belts are square in cross section and are closely related to
those found in mini voice recorders of the tape variety and many
other small mechanisms in audio and video machines. They will
not take on a 'set' (like rubber bands do) if left stretched
permanently for many years so long as the stretch no more than
about 10%. The belts are 0.6mm x 0.6mm in cross-section. There
are 5.5mm, 6.5mm, 7.5mm, 10mm & 12mm ID belts which can be
used to make up, for example, a 3.5:1 reduction when used with a
1.1mm or 1.2mm root pulley and a 5mm root pulley.  The full
range of available pulley root dimension is 1.1mm, 1.2mm,
1.7mm, 3mm, 4mm, 5mm, 6mm 7mm & 9mm. The pulleys' grooves
are Vee shaped and the 'root' is the minimum diameter at the
bottom of the Vee. The pulley OD is generally 1mm larger so for
example the 5mm root pulley is 6mm OD and the overall volume
taken up by two pulleys and a belt is smaller than for spur gears
or the reduction better. The 1.1mm root pulley is supplied with a
0.8mm centre hole to match my micro motors and the 1.2mm with
a 1mm centre hole for my midi and mini motors. The other pulleys
have 1.5mm diameter centre hole to match standard shafting,
wheelsets and larger motors like the Mashima range.  The pulleys
and belts are available individually and in two different selection
Drive Components
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Sub-miniature belt drive - Pulleys & Belts
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Pulley Spacing
Please use either of the links below to view tables of pulley size,
reduction ratio and pulley centre/axle spacing.

Click here for a spreadsheet based belt length calculator

Click here for non-functioning PDF version

Note that the reduction ratios in these files are adjusted for the
average effective drive diameter of the pulleys whilst driving the
0.6mm cross-section belt.  This results in a reasonably close
reflection of the actual reduction achieved.
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1.1mm root pulley
5.5mm ID drive belt
3mm root pulley
6.5mm ID drive belt
5mm root pulley
7.5mm ID drive belt
Friction Drive
Click here for a friction drive application note
7mm OD friction wheel
Click here for a very ingenious belt drive
application for 4mm scale standard gauge!
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1.2mm root pulley
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1.7mm root pulley
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10mm ID drive belt
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12mm ID drive belt
Please see my ONLINE SHOP for details of pricing & postage & packing
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7mm root pulley
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9mm root pulley
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Nigel Lawton 009
Email Contact:-
Online Shop - Click Here
7mm Scale 20HP WD Simplex Loco
4mm Scale 20HP WD Simplex Loco
O&K RL1c Loco
Meridian MPD18 Chassis
W. G. Allen Vee Tipper
Japanese Vee Tipper
Micro Motor (6mm x 12mm)
Micro Motor (6mm x 10mm)
Midi Motor (8mm x 16mm)
Mini Motor (10mm x 12mm)
Alumilite Casting Materials
Greenwich Coupling
Drive Components, Gears, Pulleys,
Belts, Shafts, Shaft Adapters, Friction
Prototype tipper Pictures
Vee Tipper Pictures
Upcoming Products
Customer Gallery
Free Downloads
A Modeller's Toolkit
Etching For Beginners
Whitemetal Casting for Beginners -
Whitemetal Casting for Beginners -
Resin Casting for Beginners - The
Personal Layouts
4mm root pulley
6mm root pulley
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Pulley & Belt Set 1
Pulley & Belt Set 2
Please visit my online shop to purchase these items
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