Udyr Runes explained
There's one set of runes for Udyr on patch 14.21 that is the clear favorite for LoL players and pros alike. The best Udyr rune paths on the position 
Top are 
Resolve as the primary path and 
Inspiration as the secondary path with a pick rate of 98%. Besides picking runes on Udyr you should learn how to play Udyr and if you are interested in pro matches take a look on how a pro builds Udyr. If you want to discuss 
Udyr then you should visit the champion subreddit.
Udyr runes from primary path
Resolve empowers the survivability of Udyr and increases the tankiness. Most of high elo players – and our LoL pros in the the major regions – have agreed that Grasp of the Undying is the best keystone rune to run on Udyr. This keystone rune gives Udyr alot of sustain and helps to force your opposing champion out of the lane. Other primary runes on Udyr are Shield Bash, Second Wind and Revitalize.
Shield Bash powers up your tankiness and empowers your next basic attack while you have a shield. Second Wind powers up your sustainablity in lane by healing after taking damage from an enemy champion. Revitalize inceases heals and shields you distribute or receive.
Udyr runes from secondary path
When it comes to your secondary path, most Udyr players prefer to go with Inspiration. Inspiration opens creative opportunities on Udyr troughout the match. On the Inspiration path, the best runes for Udyr are 
Approach Velocity and 
Biscuit Delivery.
Udyr gains bonus movement speed by Approach Velocity, while moving toward enemy champions that are immobilized or slowed. This rune is perfect to follow up engages by your teammates. Biscuit Delivery is a great rune for laning as it gives additional health and mana, which can help in more aggressive lanes.
FAQ for Udyr Runes
Which is the best keystone rune on Udyr?
The best keystone rune on Udyr is Grasp of the Undying. This Udyr runes setup is then referred as Udyr Grasp of the Undying.
What runes does Udyr use?
Runes from the paths Resolve and Inspiration are the most used runes on Udyr. For the exact pick rates of Udyr runes used, you have to study the rune distribution presented.