I have a mountain bike I'm planning to fit a bafang mid drive to. I have a 20 spine key to remove the bottom bracket but it doesn't fit. It appears to be a plastic fitting. How do you work out which key you need to remove it?
some plastic cups are hard to shift.
The left side, non drive side, has normal thread, first to be removed.
The right hand side, drive side, is also called the fixed side because the cup is permanently connected to the right hand ballbearing, has left hand thread (reverse thread) and to be undone last.
You may need this tool to hold the removal tool securely to the bottom bracket's axle.
It´s designed to hold the remover to the bottom bracket axle to prevent slippage during installation or removal. Can be used with square tapered axles, Shimano Octalink & ISIS Drive system. We can arrange to collect an item from you.
You can use a long M8 bolt or a crank bolt to do the same.
I have a 2ft long tube to extend the spanner and sometimes have to push the tube down with my foot.
Managed to modify the key I had with an angle grinder so now it fits. Decided I had nothing to lose as it didn't fit anything else I had! Made the grooves between the splines a bit deeper and now its a snug fit. Thanks for the help.