Sivir Runes explained
There's one set of runes for Sivir on patch 14.9 that is the clear favorite for LoL players and pros alike. The best Sivir rune paths on the position 
Adc are 
Precision as the primary path and 
Sorcery as the secondary path with a pick rate of 52%. Besides picking runes on Sivir you should learn how to play Sivir and if you are interested in pro matches take a look on how a pro builds Sivir. If you want to discuss 
Sivir then you should visit the champion subreddit.
Sivir runes from primary path
Precision improves attack and sustained damage on Sivir troughout the match. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Lethal Tempo is the best keystone rune to run on Sivir. This keystone rune gives Sivir a great head start in team fights and allows to put out more damage in that time window. Other primary runes on Sivir are 
Triumph, 
Legend: Alacrity and 
Coup de Grace.
Triumph restores on Sivir a part of missing health and award bonus gold, if a champion is killed. Legend: Alacrity grants additional attack speed to Sivir. Sivir deals with Coup de Grace more damage to targets with low health.
Sivir runes from secondary path
When it comes to your secondary path, most Sivir players prefer to go with Sorcery. Sorcery empoweres abilities of Sivir and increases the available champion resources. On the Sorcery path, the best runes for Sivir are 
Gathering Storm and 
Manaflow Band.
Gathering Storm increases your late game power. This is usually followed up by taking Manaflow Band for additional mana and mana regenaration.
FAQ for Sivir Runes
Which is the best keystone rune on Sivir?
The best keystone rune on Sivir is Lethal Tempo. This Sivir runes setup is then referred as Sivir Lethal Tempo.
What runes does Sivir use?
Runes from the paths Precision and Sorcery are the most used runes on Sivir. For the exact pick rates of Sivir runes used, you have to study the rune distribution presented.