I got the 13-tooth sprocket and anxious to put it on. Can anyone give advice on removing the countershaft sprocket. The nut is on very tight. Is there a special tool to hold the sprocket in place while removing the nut? I need to buy a socket large enough. If I need to buy a socket, can someone tell me what size the socket is?
Thanks!

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The Best way to remove it is with a 1/2" air impact gun if you have access to one.
Hope this helps Only other choice is hold the rear brake and use a large breaker bar. And worst choice Punch with brass hammer .

 

or jam the rear wheel with a brrom stick etc by putting it through the rear sprocket

 

Thanks guys. I tried the punch alternative. Didn't work. Do you know off the top of your head what size the nut is?

 

Of course you can buy an ordinary impact wrench quite cheaply, you don't need the air supply.

 

i did mine 2 weeks ago, i might be wrong but im thinkin it was a 1 1/16th socket
but im not 100% sure [:@]

 

27mm - I think impact gun is the only way to go... I had my back wheel locked right up, and a large breaker bar and she wouldn't budge.

 

This is how I got mine off.

Stand on the brake using your heel so that all of your weight is on the brake, (this is where having some extra girth comes in handy) other foot is out up in the air for balance. Reach over the bike and pull like a mother****er on the breaker bar.

Swear.

Swear louder.

Swear and say something about its mother.

It should come loose.

 

I forgot to insult it's mother! Damn it I knew I forgot something.

 

yes 27 mm and I just had someone sit on the bike and had it in first gear and the nut came right off, of you have to use an impact wrench or a breaker bar, in my opinion that's too tight. Don't forget to get the washer back off one side of the nut with a punch or a screwdriver.