Top Tips for Brompton Field Repair

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Out exploring on a Brompton folding bicycle is an incredibly experience. A Brompton rides exceptionally well, and when you get tired, or want to skip boring parts of your journey, can fold it up, and hop on public transportation. Or call a cab. If you’re on a trip, a Brompton is easy to bring on a plane. And with hard case that protects it, your Brompton will be kept in good working condition for when you land at your destination. All you have to do is unfold and go. But, as fun as Brompton exploring is, there’s always the chance of an accident. That’s why we’re providing these top tips for Brompton field repair.

Top tips for Brompton field repair

Before you set out on your journey on a Brompton, check out this field repair guide, so that when something does happen, you can quickly get back onto your bike and keep your adventure going.

Hub Gear adjustment

Time: 3-5 min

Difficulty: Easy

Slacken the lock nut N, turning the barrel B to obtain the correct setting, and relocking nut N.

Ensure the indicator rod is the correct length for the hub-type.

The indicator chain is correctly adjusted when the shoulder S on the indicator rod IR is proud of the axle end by no more than 1mm (this can be seen by looking through the whole in the chain tensioner nut CTN) when the in the middle position on the shifter is selected.

Hub Gear adjustment - Top tips for Brompton field repair.
Hub Gear adjustment – Top tips for Brompton field repair.

Rear Wheel – removal and refitting

Time: 3-5 min

Difficulty: Easy

When removing the rear wheel it is easiest to do it with the bike in the parked position, with the tyre deflated.

Removing the Chain Tensioner

Shift into top gear and pedal a little to engage. On a bike with a Sturmey Archer hub (3 or 6-speed gearing), slacken off the knurled locknut N and unscrew the barrel B.

The indicator chain GICH should be unscrewed and removed.

Move the arm, CTARM, anti-clockwise and lift the chain off; allow the CTARM to move clockwise until it comes to a stop.

Undo the securing nut CTN and remove it and its washer. The chain tensioner assembly may now be removed.

Removing the Wheel

Slacken the wheel nuts, to allow the tab-washer to disengage from the axle plate, push the rim from side to side to disengage the tab-washers. The wheel can now be removed from the bike.

Fitting the Wheel

Make sure the chain passes round the rear sprocket. Drop the axle into the slots, with the tab washers the correct way round. Make sure that on each side the axle is seated and tighten the wheel nuts to 18Nm.

Fitting the Chain Tensioner

Arrange the chain so that it is running over both chainring and rear sprocket (on a derailleur, providing high gear is selected, this should be the smaller sprocket).

Address the chain tensioner to the axle plate and press home. Make sure that the idler sprocket lies above the chain & between the “uprights” of the chain-pusher-plate.

Refit the nut CTN/washer and tighten to 5Nm. Refit the indicator chain and adjust as shown opposite.

Using the Toolkit to fix a puncture

Time: 10-30 min

Difficulty: Easy

Take the toolkit out of the front frame, and remove the outer sleeve.

Take the wrench from the toolkit and use the 15mm spanner to undo and remove the rear wheel.

Remove the tire levers, gently press the plastic tab and lift the levers away from the plastic core.

To make the tire easier to remove, push the bead into the center of the rim.

Insert the tire levers into the rim and push down to lever a section of the tire bead above the rim.

Use the hook on the end of one of the levers to hook around a spoke, to keep the lever in place.

With the other lever, work your way around the rim to release the bead.

Push the valve of the inner tube, up into the tire and remove the inner tube from the tire.

Check the inside and outside of the tire for sharp objects that may have pierced the tube.

Inflate the tube to find the puncture, you will be able to hear / feel the air escaping from the hole.

Use the abrasive paper in the toolkit, roughen the surface of the tube around the hole.

Using the Toolkit to fix a puncture.
Using the Toolkit to fix a puncture.

Remove the backing from the adhesive patch and apply to the tube over the hole.

Apply pressure to the patch for 30 seconds to fix it in place.

Inflate the tube a little, until it holds its shape as this will make it easier to refit.

Align the valve on the inner tube with the corresponding hole in the wheel rim.

Insert the tube into the tire and feed the valve through the valve hole.

Use the tire levers to re-seat the tire bead into the rim, be careful not to pinch the tube.

Inflate the tire.



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