Beskriuwing
N4W is spesjaal ûntwurpen foar SPGO as reserve-ring, it kin it probleem fan seelflatering troch oermjittige seelspieling minimalisearje.
N4W-ôfmjittings:
| MAAT MM |
| N4W 70*65*2.5 |
| N4W 90*85*2.5 |
| N4W 95*90*2.5 |
| N4W 100*95*2.5 |
| N4W 105*100*2.5 |
| N4W 110*104*3 |
| N4W 115*109*3 |
| N4W 120*114*3 |
| N4W 125*119*3 |
| N4W 130*124*3 |
| N4W 135*129*3 |
| N4W 140*134*3 |
| N4W 145*139*3 |
| N4W 150*144*3 |
| N4W 160*154*3 |
| N4W 170*164*3 |
| N4W 180*174*3 |
