SECTION L: SPECIFICATION OF SPARES.
Chain: this must have the correct number of links for a given sprocket combination, as noted
below. Also traditional joining links are usually unsuitable because the pin is too long: so instead
the joint should be made by pressing in the rivet pin. We recommend Sram PC1 (1/8") and PC10
(3/32") chain.
· for non-derailleur, size ½" x 1/8": max. pin length 8.7mm: number of links 50T/13T/98L,
44T/13T/96L, and 44T/14T/96L
· for derailleur, size ½" x 3/32": max. pin length length 7.4mm: number of links 54T/16T/104L,
50T/15T/100L, and 44T/15T/98L (the rear sprocket size given is that of the larger, inner
sprocket).
Rear sprockets for geared hub (to ISO 10230): non-derailleur, ½" x 13T x 3mm thick (but for
lower gearing, use a 14T or 15T sprocket): derailleur, special Brompton sprockets, 13T and 15T
only.
Chainset. Best to use the Stronglight set specified for the Brompton. If you use an alternative,
make sure that it suits the BB axle (ISO 6695), that it gives the correct chainline (fig HK4), and
that the end of the crank does not clash with any part of the rear frame when the bicycle is parked.
BB cartridge. ISO 6695. For C-type, Ritmo S x 127mm. For other models, FAG 119mm.
Chain tensioner idler sprockets: non-derailleur, 10 tooth x 3/32" wide at the teeth, x 1/2" wide at
the centre, mounting hole to receive M5 bolt: derailleur, special flanged Brompton idlers.
Brake pads: Alhonga HJ 454-11.
Tyres: size 16" x 1.3/8", ETRTO 37-349. Inner tube with Schrader valve. Best to use the
special high-pressure Brompton tyres (see Section M). But if you cannot obtain these, choose
another reputable make: take care, as some tyres lose shape on inflating, and/or offer a lot of
rolling resistance, and some tubes lose pressure fast.
Control cables: The cable routing and terminations are critical. For outer cables the length, and
ferrule diameter should be identical to that of the cable originally fitted: for the front brake cable,
the outer must be in two parts of the correct length, so that the cable gathering ring occupies the
right position in the cable system. You are best advised to use cables supplied by BROMPTON. If
you have to use cables from another source, specify low friction cables (PTFE coated inner
cable, lined outer cable).
Dynamo: AXA IQ right hand fitting. Other 6v dynamos are also suitable, but you may need to fit a
special slotted stay (available from Brompton).
Front lamp bulb: 6 volt x 2.4 watt halogen. Do not touch the glass when fitting.
