Used for competition bicycles to be used in club activities.
On 2018-02-15 15:19:17
It is used when the small gear lock ring of the competition bicycle is chipped and it can not be removed with a normal tool. Until now it was held down by vise, but it was made easy to remove with a double-headed head turn.
Bicycle cup & cone type bottom bracket lock ring attached / detached
On 2012-04-09 16:58:37
If the notch of the lock ring is three types, it can not be grasped by the hook part. I was able to pinch and turn in jagged parts, but scratched the lock ring. If it is four types you can grasp it perfectly with the cutout. I regret that cheap hook spanner was enough.