Montague Octagon quick release height adjustable steerer extenders.
- Long length adjusts up to 4 inches
- Fast, easy handlebar height adjustment without tools
- Octagonal shape keeps steering engaged while raising and lowering the stem
- Automatically maintains minimum insertion
- Clamps to top of steerer, original stem clamps to top of Octagon device
- Due to variations in aluminum steerer tube wall thickness, the manufacturer specifies usage only with 1-1/8" threadless steel steerer tubes
- Must be installed by a professional bicycle mechanic