Owners of older Shimano STI road bikes (the 'antenna' cable style) who want easy on-the-fly indexing.
The Jagwire Sport Direct Rocket II is a small upgrade that makes gear tuning much easier. It fits directly into the housing stop of Shimano STI road levers that run their gear cable outside the bar tape, the ones with the cables poking out the side.
A rubber-coated knob gives you grip even with gloves on, so you can take out a little cable stretch mid-ride. They take standard 4 mm gear housing and come as a pair.
Direct fit
Goes straight into Shimano STI levers with external cables.
Grippy knob
Rubber coating for adjusting with gloves on.
4 mm housing
Takes standard gear housing.
Pair
One for each lever.
Adjuster
In the box
Great for
Maybe not for
For 4 mm gear housing on Shimano STI levers with external shift housing. Check the lever before buying.
Quick indexing
If your rear shifts are slow going to a bigger cog, turn the adjuster anticlockwise a quarter turn at a time until it snaps across cleanly. If it's slow going to a smaller cog, turn it the other way.
Cables, housing and the bits in between.
Jagwire specialises in bicycle cables, housing and cable accessories, and its parts are used by bike brands and workshops worldwide.
