When it's time to adjust the spoke tension of your Shimano wheels, reach for the Park Tool SW-14. 5 Spoke Wrench for Shimano Wheel Systems. This spoke wrench features a double-sided design that fits both 4. 4 and 3. 75-millimeter spoke nipples of Shimano Wheels. It's precision-machined and plated for durability, then dipped in vinyl for grip and dexterity in hand.