General Information On Barrel Adjusters

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Introduction

A barrel adjuster will allow the fine adjustments to the tension of control cables. Screwing it out - anti-clockwise - extends the length of the outer-cable run while leaving the length of the inner-cable unaffected. Thus the inner-cable gets tighter.

Step 1

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<h3>Step 1</h3><p>Barrel adjusters are used in braking systems to compensate for brake-block wear. The adjusters are usually designed and positioned so the rider can turn them ‘on the fly’. Barrel adjusters on gear-cables allow fine tuning to make index systems work precisely.
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Purpose

Barrel adjusters are used in braking systems to compensate for brake-block wear. The adjusters are usually designed and positioned so the rider can turn them ‘on the fly’. Barrel adjusters on gear-cables allow fine tuning to make index systems work precisely.

Step 2

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<h3>Step 2</h3><p><li>Barrel adjusters can be found anywhere along a cable-run</li>
<li>where the cable exits from a brake or gear lever</li>
<li>where the cable enters a brake or gear mechanism</li>
<li>where inner-cable exits from outer-cable at a stop on the frame</li>
<li>an in-line barrel adjuster can sit anywhere in a section of outer-cable</li></p>
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Where To Find Barrel Adjusters?

  • Barrel adjusters can be found anywhere along a cable-run
  • where the cable exits from a brake or gear lever
  • where the cable enters a brake or gear mechanism
  • where inner-cable exits from outer-cable at a stop on the frame
  • an in-line barrel adjuster can sit anywhere in a section of outer-cable
  • Pro Tip

    Barrel adjusters usually have a locking mechanism. To stop them moving when they’re not being adjusted.

    Step 3

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    <h3>Step 3</h3><p>The barrel may lock with a lock-ring – or lock-nut – that runs along the thread of the barrel and can be jammed against the end of the thread once the adjustment is in the right place. Unscrew the lock-nut to allow the barrel to move.
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    Lock-ring Or Lock-nut

    The barrel may lock with a lock-ring – or lock-nut – that runs along the thread of the barrel and can be jammed against the end of the thread once the adjustment is in the right place. Unscrew the lock-nut to allow the barrel to move.

    Step 4

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    <h3>Step 4</h3><p>Gear adjusters may be self-locking, these have a plastic sleeve on the outside of the barrel. The sleeve has small teeth at one-end that engage with a matching key at the end of the barrel thread. A spring pushes these sets of teeth together. To adjust the barrel, slide the teeth apart then turn the sleeve. Once the sleeve is released the spring re-locks the adjuster automatically.
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    Spring-loaded, Self-locking

    Gear adjusters may be self-locking, these have a plastic sleeve on the outside of the barrel. The sleeve has small teeth at one-end that engage with a matching key at the end of the barrel thread. A spring pushes these sets of teeth together. To adjust the barrel, slide the teeth apart then turn the sleeve. Once the sleeve is released the spring re-locks the adjuster automatically.

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