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#PRO TOOLS 12 REVIEWS HOW TO#

Use this position on the rim as your reference point.

Start with the valve at the bottom, line up the tool’s indicator rod with the outer surface (lip) of the rim.

It’s easy to cross-thread it if you’re not careful.

Carefully thread the derailleur hanger tool in place.

It can help to pull back on the derailleur and relieve the spring tension.

You must first remove the rear derailleur from the hanger.

Once the 6 and 12 o’clock positions line up, check the 9 o’clock position and bend as needed until these three positions line up evenly with each other, as shown in the sequence below or in this video. The arm of the tool provides plenty of leverage for gently “persuading” the hanger back into alignment. If the gauge doesn’t line up with the rim then the hanger is bent. Using a hanger alignment tool is therefore a matter of lining up the gauge with the rim at the 6 o’clock position, then swinging it up to 12 o’clock. When the gauge is equidistant from the rim at the six, nine, and 12 o’clock positions, the hanger is perfectly aligned. Typically, the tool threads in place of the rear derailleur to provide a pivoting gauge that is used to measure the distance between the tool arm and the rim of the rear wheel.Īs long as the derailleur hanger is tight, the wheel is true, and the hub axle is straight, the hanger tool effectively measures how perpendicular the derailleur hanger is to the rear hub axle.

#PRO TOOLS 12 REVIEWS HOW TO#

How to use a derailleur hanger gauge toolĭerailleur hanger gauges may seem complex, but their function is quite simple. Similarly, hanger alignment can be impacted by simple things such as a bike being badly transported in a car, or bumped while awaiting its rider at a café. Truthfully, about a third of new bikes straight out of the box would display hanger alignment issues, which were then carefully rectified.

In fact, I’ve worked in shops where the policy was to check every single new bike sold, and any quality bike being serviced. However, as cassette sprocket spacing has become progressively tighter, and frames have become lighter, such a tool has become all the more necessary. In this updated version of a feature first published in 2016, we investigate, review, and compare the best options when it comes to derailleur hanger alignment gauge tools.Ī hanger tool was previously thought to be a shop-only item, especially as it only requires occasional use. A derailleur hanger alignment gauge tool is not only extremely useful for diagnosing that your hanger is, in fact, bent, but also for making it straight again. That manifests as dodgy and inconsistent shifting that no amount of cable-tension adjusting, limit-screw fiddling or chain cleaning will solve. Best ruin a replaceable piece of aluminium than write off an expensive derailleur, or worse, the frame.īut because derailleur hangers are designed to be sacrificed, that also means they’re prone to bending. As a result, it’s the little hanger the derailleur’s bolted to that is commonly designed as a weak point. Sticking out in the wind, controlling your rear gears and just waiting to be bent, the rear derailleur sits in a precarious position.