diff --git a/scad/vitamins/belts.scad b/scad/vitamins/belts.scad
index 082df3c..48639f9 100644
--- a/scad/vitamins/belts.scad
+++ b/scad/vitamins/belts.scad
@@ -10,6 +10,7 @@
 T5x6 =  [  5,  6, 2.25];
 T5x10 = [  5, 10, 2.25];
 T2p5x6 =[2.5,  6,  1.7];
+GT2 = [2.0,  6,  1.33];
 
 function belt_pitch(type) = type[0];
 function belt_width(type) = type[1];
diff --git a/scad/vitamins/pullies.scad b/scad/vitamins/pullies.scad
index 2ec84d0..b0b8b3d 100644
--- a/scad/vitamins/pullies.scad
+++ b/scad/vitamins/pullies.scad
@@ -6,10 +6,11 @@
 // hydraraptor.blogspot.com
 //
 pulley_inner_radius = (14.4 / 2) - belt_thickness(T5x6); // measured from outer diameter
-
+//                     0                               1   2             3                4    5  6    7     8    9 10   11   12             13 14 
 T5x10_metal_pulley  = ["T5",                          10, 15,    12.85 / 2,            11.6, 7.9, 7,   5, 19.3, 1.7, 3, 10.7, [0,     0, -2], 0, M3_grub_screw];
 T2p5x16_metal_pulley= ["T2.5",                        16, 12.16, 12.16 / 2 - 0.8,         8,  16, 5.7, 5, 16.0, 1.0, 6, 3.75, [0,     0,1.3], 0, M4_grub_screw];
 T5x8_plastic_pulley = ["../imported_stls/pulley.stl",  8,     0, pulley_inner_radius,     0,   0, 0,   5,    0,   0, 6,    4, [-10, -10,  0], 6, M3_grub_screw];
+GT2x20_metal_pulley = ["GT2",                         20, 12.2, 12.2 / 2 - 0.8,           8,  10, 8,   5, 18.0, 1.0, 6, 3.75, [0,     0,1.3], 0, M3_grub_screw];
 
 function pulley_type(type)             = type[0];
 function pulley_teeth(type)            = type[1];