They have the effect of a loose centre lip for the two roller sets.
他们有一个宽松的两辊套中心唇的效果。
2
Rolling bearings. single - row cylindrical roller bearings. chamfer dimensions for loose rib and non - rib sides.
滚动轴承。单列圆筒形滚子轴承。平挡圈和非凸缘边的倒圆角尺寸。
3
The Front Guards will help you riding off the rollers, in case you loose your balance badly. It will stop you riding off the roller, as well as slowing the wheel speed.