[Mtrain17]

I'm interested in cleaning out my headset and whatnot and I'm not sure what size headset wrench to get, I measure the adjustable cup (or at least i think that's what it is) with a ruler and measured it to be 4mm across. All the options for headset wrenches to be 32mm or 36mm. How do I figure out what size to buy? Thank you.

 

[Industry_Hack]

Most of the headset wrenches I have are double-ended, with 32mm on one side, and 36mm on the other.

 

[Mtrain17]

Are those the only two sizes that they usually come in?

 

[Industry_Hack]

Those are the common ones. This link might help.

 

[qmsdc15]

4cm? or 40mm? Perhaps this one. http://www.parktool.com/product/headset-wrench-hcw-9

Actually, you'll need two of them.

 

[trx1]

I hear channel locks work good too.

 

[Merlincustom]

http://sheldonbrown.com/headsets.html

 

[davereo]

12" adjustable wrench fits all.

 

[billnuke1]

I'm interested in cleaning out my headset and whatnot and I'm not sure what size headset wrench to get, I measure the adjustable cup (or at least i think that's what it is) with a ruler and measured it to be 4mm across. All the options for headset wrenches to be 32mm or 36mm. How do I figure out what size to buy? Thank you.

As nentioned before, check out the Park Tool site. Get yourself the Park Tool Big Blue Book! Get the latest edition. The chapter that covers the repair that you are doing also tells you what tools to use. I've repaired my own bikes for years, but still refer to the book for some repairs. My bike collection goes from the 50's to the 00's! The book that I have covers all of these years!