JAR­GON

Mountain Biking UK - - WRECKED & RATED -

DOU­BLE/ TRIPLE-BUTTED

A tube that changes wall thick­ness two/ three times along its length. Nor­mally thicker at the ends, where it needs to be strongest.

SHIM

Ma­te­rial dropped into a tube or gap to space it out. In this case, a split tube that gives a snug fit for a flex­ier 27.2mm seat­post in a seat tube sized for a stouter 31.6mm post.

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