The ROTOR spacers are allow the cranks to be centered and adjusted, thus eliminating the possibility of gaps and misalignments.
Included:
2 units Type ""D"" of 11 mm conical spacer
2 units Type ""C"" of 8 mm spacer-black
2 units Type ""F"" of 3 mm spacer-black
2 units ""Type A"" of 2 mm spacer-black
4 units 3D+ 0.5 mm washer-plastic
