can anyone help me and calculate the spokes for this rim and hub http://www.tartybikes.co.uk/20_inch_rims/tryall_hole_front_20/c26p10651.html + http://www.tartybikes.co.uk/front_disc_hubs/rockman_sealed_front_disc_2012/c20p11838.html
im using 2 cross both sides, and its 28H hu. Every time im doing it it is different
one gave me :
Spoke length left
179.9 mm
Spoke length right
187.1 mm
and the other is 1mm different, what is OSB ?