
Passive
Hextech Capacitor
When Jayce swaps weapons he gains Move Speed for a short duration.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
When Jayce swaps weapons he gains Move Speed for a short duration.

Q
Hammer Stance: Leaps to an enemy dealing physical damage and slowing enemies. Cannon Stance: Fires an orb of electricity that detonates upon hitting an enemy (or reaching the end of its path) dealing physical damage to all enemies hit.
Base values from ability rank 1 upward.

W
Hammer Stance: Passive: Restores Mana per strike. Active: Creates a field of lightning damaging nearby enemies for several seconds. Cannon Stance: Gains a burst of energy, increasing Attack Speed to maximum for several attacks.
Base values from ability rank 1 upward.

E
Hammer Stance: Deals magic damage to an enemy and knocks them back a short distance. Cannon Stance: Deploys an Acceleration Gate increasing the Move Speed of all allied champions who pass through it. If Shock Blast is fired through the gate the missile speed, range, and damage will increase.
Base values from ability rank 1 upward.

R
Hammer Stance: Transforms the Mercury Hammer into the Mercury Cannon gaining new abilities and increased range. The first attack in this form reduces the target's Armor and Magic Resist. Cannon Stance: Transforms the Mercury Cannon into the Mercury Hammer gaining new abilities and increasing Armor and Magic Resist. The first attack in this form deals additional magic damage.
Base values from ability rank 1 upward.