Spokes length?
 

Hello everyone

i am quite new in the bmx world.
i bought Sun Ringle Superstock BMX front and rear Hubs & ALIENATION "Stay Strong" Runaway Rim of 20 inches.


Rim spec:
SPECS
USE: Rear street, park, trail or race rim (can be used on front as well
WORKING SIZE: 20x1.75"
MATERIAL: 6061 T6 Aluminum
WIDTH: 31.7mm
HOLE COUNT: 36 hole
BEAD DIAMETER: 406mm
ERD: 391mm
TIRE FIT: 20x1.50" to 20x2.3"
VALVE: Schrader Valve
DESIGN: Double wall, Welded at seam for strength, Great for Park, Street and Trail

Hubs dimensions :
Front
Right Side Flange Diameter 45mm
Left Side Flange Diameter 45mm
Right Side Center to Flange Dimension 30mm
Left Side Center to Flange Dimension 30mm

Rear
Right Side Flange Diameter 45mm
Left Side Flange Diameter 45mm
Right Side Center to Flange Dimension 26mm
Left Side Center to Flange Dimension 26mm


i am stuck right now with the spoke length i should go to, i tried calculating it online but i failed. can any one tell me what size i should go for?

Thanks