Brompton Bicycle Owner's Manual download pdf (Page 8)

SECTION C: USING THE BROMPTON.

1. Tyre pressures:

BROMPTON HP

& Marathon:

STELVIO

Normal Max. Normal Max.

FRONT

60 - 80 psi 100 psi 85 - 100 psi 120 psi

REAR

70 - 90 psi 100 psi 95 - 110 psi 120 psi

The most appropriate pressure depends on

your weight and preference. On rough roads,

it's obviously more comfortable if you keep the

pressures near the lower end of the ranges.

However, for minimum pedalling effort, use the

higher pressures.

With under-inflated tyres, pedalling is hard

work, and the risk of punctures is higher: KEEP

YOUR TYRES WELL INFLATED.

A car-type valve is used, allowing various

methods of inflation. The Brompton HP pump is

well suited, and can be kept on the rear frame

(unless it’s titanium). When fitting the pump, make sure that its seal doesn’t

prevent pump-spring from giving full engagement with the pump locators.

You can also use a standard car foot- or hand-pump, or an air line. With

compressed air, the pressure in the tyre may rise very quickly: so let the air

enter in short bursts, checking the pressure all the time. If you use a bike

pump with a flexible connector, you have to unscrew the connector very

swiftly to avoid air loss.

2. Gears:

Two gear systems are used on Bromptons, derailleur (left hand trigger) and

hub gears (right hand trigger). To keep things simple, follow two rules for

changing gear:

a) when moving, keep pedalling, but take the pressure off the pedals while

making the change, and

b) when stationary, avoid using the left hand trigger, and for the right hand

trigger, back pedal a little to allow the new ratio to engage (if, when pulling

the lever on the RH control down, you encounter unusual resistance, do not

force the control: instead, back pedal and try again).

Gear adjustments will be needed from time to time, particularly during early

use: see section F. With hub gears, if transmission is not smooth in any

gear, take remedial action straight away, as otherwise damage could result.

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Brompton Bicycle Owner's Manual Page 8