Front sprocket nut size RD400

[Membername]

Anyone know the size on the front sprocket nut?  RD400

K

[bitzz]

If you're trying to replace it you'll NEED the OEM part.
That nut is counter bored.

[Membername]

Just need to replace the sprocket and am wondering what size socket to buy for the nut.  From my caliper measurement it seems like it is 31 or 32mm?

K

[2steve]

I confess that I just used 1 1/4 inch socket on mine. Kinda difficult coaxing it on by gently tapping back and forth. Worked fine though, after making sure I had full engagement. Used a Harbor Freight electric impact driver.

32mm = 1.2598", so you need a 32mm socket or 1 1/4" if it will cooperate.