SPARK Expander bottombrackets 400 / 420 / 440

400 / 420 / 440 mm

Also a great choice for cargo bikes and other urban utility bikes

Finding spare bearings for the unit is also made much easier - they are also available at our webstore

Replacement or conversion cassette body for our ACCELERON wheelset

SPARK Expander bottombrackets 400 / 420 / 440Like many other expander bungs, the SPARK expander fits inside the fork steerer tube and gives the stem clamping area some reinforcement for safe stem installation, it also allows the secure compression of headset bearings when the steerer top cap is screwed into it. But, unlike a lot of other compression bungs, it features a channel running through it that aids the routing of dynamo power cables, which then exit through the port in the top cap to