![]() ![]() Looking at a fairly new Focus branded FSA chainset I have, that has a similar arrangement between the bearing cups to keep crud and wet out. In lieu of the real McCoy i've used cardboard for the same job although it's crap at keeping the wet out, the dirt is kept at bay. The simple fitting of the plastic tube, which can be as flimsy as you like as it serves no other purpose, worked / works fairly well at doing this. It was a regular occurrence to find the BB full of water that had made its way in through the seat tube and contaminating the bearings as well as swarf/rust from the frame itself. Nothing to do with weight saving, it dates back to the late 70's / earl 80's when BB's were two cups, loose balls and an axle and frames didn't use plastic cable guides with the accompanying hole to fit them. what a silly design, so much for progress and saving a few grms ![]()
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