高速ベアリングに関しては納豆菌は有効かもですが、せいぜい100rpm程度のチェーンの回転で納豆菌が必要かどう…

Default Widget

This is Sidebar 1. You can edit the content that appears here by visiting your Widgets panel and modifying the current widgets in Sidebar 1. Or, if you want to be a true ninja, you can add your own content to this sidebar by using the appropriate hooks.