Ronstan 40mm Single Orbit Block with
Integral Becket and Swivel Head
Kilogram for kilogram of working load, BB
and RT Orbit Blocks™ are the world’s lightest. The unique orbital design
allows the bearing to only be in the active areas of the floating
sheave. This minimises the mass of the inactive return race and hub.
Weight and bulk are further reduced in the
different block configurations. The ball bearing single and becket block
has a through-sheave becket arrangement. The result? The lowest weight
Multi-sheave blocks have only single
intermediate cheeks and an ultra-light and efficient head arrangement.
This gives a 30% weight saving advantage over the nearest competitor.
Other brands just link together their single blocks. This results in
unnecessary double cheeks between each sheave, held together by a heavy
steel channel across the top of the block.