I’ve been running the plastic Shimano on my Whippet for about 18 months. All was good (except lots of creaking in the early days which eventually settled down) until recently when a few mm of play quickly developed in the cranks. Seems the bearing housing on the drive side has degraded somewhat – not surprising as its been taking single speed abuse all its life.
Anyhoo – yesterday i replaced it with a lovely alloy KCNC one same as this:
Going out for a few hours for first time today and will report back…
All fine. 17 (sunny) miles later and nothing adverse to report. Not even a squeak from it and felt smooth-as. Let’s see if it has staying power.
PS. I actually liked the Shimano one and it felt like it was almost ‘not there’ – which i reckon is high praise for a BB. Shame it made such a frustrating racket in the early days and had a removal problem with its drive-side bearing mating with the crank axle, forcing me to spend ages drifting it off.