sebcast

Hi,

I have this Chinese front loader cargo trike that I will be adding a tongsheng mid drive electric motor to.

I removed the cranks and now I need to remove the bb, but I want to be sure of the tool I need to buy.

Could you help me ID the correct tool?




Also, there's this metal piece on the drive side (third photo) anyone know what it is?

Thanks!

Bill Kapaun

I expect any "common" 20 spline BB tool would work.
https://www.google.com/search?q=park...client=gws-wiz

Other item? Maybe mounting tabs for a chain guard?

soyabean

They ommited a few splines, it's still a 20-splines 32mm "standard", the Park Tool BBT-22 tool will work.

Bill Kapaun

I wouldn't be surprised if you have a cup & cone system in what appears to be a "cartridge" type BB, considering the country of origin.
IF so, the spindle probably doesn't have polished bearing surfaces, rather a black oxide coating. If the bike is used, expect pitting.

Apply some "real" penetrating oil now. Let soak for a bit and repeat if it seems to be "wicking it up". (I buy non aerosol so I can apply with a hypodermic needle where I want it instead of hosing down the neighborhood.)
This is how I retain the tool because sometimes BB's can be TIGHT!
I have a couple different length 8mmx1mm bolts in addition to the crank bolt + a "stack" of 3/8" fender washers.
This is to adjust for different length spindles.


I then use a BIG adjustable wrench.

Often, these "Chinese splines" aren't well formed and prone to slip. This can ruin tools and put your removal job up a couple more notches on the PITA level.
Thus the tool retainer.

sebcast

Thanks for the replies.
Indeed, a "regular" 20 spline tool will work.
Found this video with more details: