Hecarim Runes explained
There's one set of runes for Hecarim on patch 14.9 that is the clear favorite for LoL players and pros alike. The best Hecarim rune paths on the position 
Jungle are 
Sorcery as the primary path and 
Precision as the secondary path with a pick rate of 60%. Besides picking runes on Hecarim you should learn how to play Hecarim and if you are interested in pro matches take a look on how a pro builds Hecarim. If you want to discuss 
Hecarim then you should visit the champion subreddit.
Hecarim runes from primary path
Sorcery empoweres abilities of Hecarim and increases the available champion resources. Most of high elo players – and our LoL pros in the the major regions – have agreed that 
Phase Rush is the best keystone rune to run on Hecarim. Phase Rush offers more flexibility and options to betake oneself in and out of danger, which can be helpful since that's essentially the main playstyle of Hecarim. Other primary runes on Hecarim are 
Nimbus Cloak, 
Celerity and 
Waterwalking.
Nimbus Cloak, which grants movement speed upon using a summoner spell, works amazingly well with junglers in particular as they take the shortest cooldown summoner spell, 
Smite. Celerity boosts all movement speed bonuses to Hecarim. Waterwalking grants movement speed in the river, which helps Hecarim get around the map quicker. The extra damage will also help in those all important dragon and baron fights.
Hecarim runes from secondary path
When it comes to your secondary path, most Hecarim players prefer to go with Precision. Precision improves attack and sustained damage on Hecarim troughout the match. On the Precision path, the best runes for Hecarim are 
Triumph and 
Legend: Tenacity.
Triumph restores on Hecarim a part of missing health and award bonus gold, if a champion is killed. Hecarim gains extra Tenacity with every additional stage of Legend: Tenacity.
FAQ for Hecarim Runes
Which is the best keystone rune on Hecarim?
The best keystone rune on Hecarim is Phase Rush. This Hecarim runes setup is then referred as Hecarim Phase Rush.
What runes does Hecarim use?
Runes from the paths Sorcery and Precision are the most used runes on Hecarim. For the exact pick rates of Hecarim runes used, you have to study the rune distribution presented.