|      RECOMMENDED PULLEY PITCH DIAMETERS  ( mm )  
 |  | Y | Z | A | B | C | D | SPZ | SPA | SPB | SPC |  
 | 
 | 20 | 50 | 75 | 125 | 200 | 355 | 67 | 100 | 160 | 224
 | 
 |    22.4 | 53 | 80 | 132 | 212 | 375 | 71 | 106 | 170 | 236
 | 
 |  25 | 56 | 85 | 140 | 224 | 400 | 75 | 112 | 180 | 250
 | 
 |  28 | 60 | 90 | 150 | 236 | 425 | 80 | 118 | 190 | 265
 | 
 |  31.5 | 63 | 95 | 160 | 250 | 450 | 85 | 125 | 200 | 280
 | 
 |  35.5 | 67 | 100 | 170 | 265 | 475 | 90 | 132 | 212 | 315
 | 
 |  40 | 71 | 106 | 180 | 280 | 500 | 95 | 140 | 224 | 355
 | 
 |  45 | 75 | 112 | 190 | 315 | 530 | 100 | 150 | 236 | 400
 | 
 |  50 | 80 | 118 | 200 | 355 | 560 | 112 | 160 | 250 | 450
 | 
 |  56 | 85 | 125 | 212 | 400 | 630 | 125 | 180 | 280 | 500
 | 
 |  63 | 90 | 132 | 224 | 450 | 710 | 140 | 200 | 315 | 560
 | 
 |  71 | 95 | 140 | 236 | 500 | 800 | 150 | 250 | 355 | 630
 | 
 |  80 | 100 | 150 | 250 | 560 | 900 | 160 | 315 | 400 | 800
 | 
 |  90 | 112 | 160 | 280 | 630 | 1000 | 180 | 400 | 500 | 1000
 | 
 |  100 | 125 | 180 | 315 | 800 | 1250 | 200 | 500 | 630 | 1250
 | 
 |  112 | 140 | 200 | 355 | 1000 | 1600 | 250 | 630 | 800 |   
 | 
 |  125 | 150 | 250 | 400 | 1250 | 2000 | 315 | 800 | 1000 |   
 | 
 |     | 160 | 315 | 500 |    |    | 400 | 1000 | 1250 |    
 | 
 |     | 180 | 400 | 630 |    |    | 500 |     |     |   
 | 
 |     | 200 | 500 | 800 |    |    | 630 |     |     |   
 | 
 |     | 250 | 630 | 1000 |    |    | 800 |     |     |   
 | 
 |     | 315 | 800 | 1250 |     |     |     |     |     |    
 | 
 |     | 400 | 1000 |     |     |     |     |     |     |    
 | 
 |     | 500 |     |     |     |     |     |     |     |    
 | 
 |     | 630 |     |     |     |     |     |     |     |    
 | 
 |     | 800 |     |     |     |     |     |     |     |    
 |