Highly recommended for derailleur-geared touring cyclists, along with Unior's NBT2 To replace a driveside spoke (the most likely breakage) you need to take off the cassette, requiring a chain-whip, ...

If you’re heading off on a tour to anywhere vaguely remote, being able to change a broken drive side spoke should be a part of your supplies checklist. Normally you’d need a three-pronged attack to ...