7s sprocket ok on 9s cassette?

[MrWiZo]

I have a 7 speed 11-34 cassette, and I'd like to use th 11t sprocket on a 9 speed cassette. Possible? Easy? Need a different spacer?
Sprocket just too thick to get away with?

I see that I can go the other direction; in
http://www.sheldonbrown.com/k7.html#custom Sheldon says:

But I don't know if it would work the other way.

[mfried]

I've noticed the 13T has a recess on my 7s Megarange, but the 15T does not. If customizing cassettes, need we verify first, when acquiring/selecting the cassette for installation adjacent the 11T, the second smallest cassette has a recess, or do all resonably probable second smallest cassettes (12/13/14) come with the recess for mating to the 11T?

Am I correct is suspecting only the 11T sprockets fit into recesses on the adjacent sprocket?

[MrWiZo]

I've finally got an excuse to visit Harris Cyclery! Yay!

I'll see you Saturday if I don't make it in sooner.

Should be Sheldon "The man with the answers" Brown...

[sjannasch]

That's true on the Megarange (11-34) 7-speed, and, I believe on all
8-speeds.

It's not the case on 9-speeds, and I don't think it's true of all
7-speeds either.

Sheldon "Recess Is Over" Brown
+---------------------------------------------+
+---------------------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide
http://captainbike.com http://sheldonbrown.com

[MrWiZo]

BTW, all Shimano; the 7 speed is a "MegaRange" HG and the 9 speed is a 2001 105. The end result will go on a 105 9 speed hub with a 105 rear derailleur.