truman sparks
Well-Known Member
So - I have a 2017 Brompton S6R, which has now had 3 bottom brackets fail, the latest one failing after just one month...
For the past 18 months, I've clocked up around 60 miles per week commuting to work , so bike has maybe covered 4k miles, all weathers, mostly cycle path (tarmac). I'm tall, 90kg and spin, rather than grind...
When replacing BB (which I've done on many other bikes without issue), I don't think I'm overtightening the 'composite' shells, and would have thought that the splines of the fitting tool would make the plastic material give way before doing damage to the bearings (always the drive side failing) - I stand to be corrected though!!
Nearest Brompton dealers are 60 miles away, hence DIY approach.
Any suggestions before I fit number 4?
TIA
For the past 18 months, I've clocked up around 60 miles per week commuting to work , so bike has maybe covered 4k miles, all weathers, mostly cycle path (tarmac). I'm tall, 90kg and spin, rather than grind...
When replacing BB (which I've done on many other bikes without issue), I don't think I'm overtightening the 'composite' shells, and would have thought that the splines of the fitting tool would make the plastic material give way before doing damage to the bearings (always the drive side failing) - I stand to be corrected though!!
Nearest Brompton dealers are 60 miles away, hence DIY approach.
Any suggestions before I fit number 4?
TIA