Difference between 8 and 9 speed cassettes?

[PATRICK MOORE]

Is the difference only in the spacers, or does 9 sp have thinner cogs, too? I once built my own 9 sp cassette with cogs lying around, using 9 sp spacers scavenged from a bike shop, but my present hub body (8 sp) seems to have no room after I stick 8 on with spacers. 

No big deal, but if 9 sp spacers will allow nine 7or-8 speed cogs to fit on a standard hub body, why not go nine?

Patrick "13 [want 14] -15-16-17-19-22-26-32/12-13-14-15-16-18-21-28" Moore

--

-------------------------
Patrick Moore, Albuquerque, NM, USA
For professional resumes, contact Patrick Moore, ACRW
http://resumespecialties.com/index.html
-------------------------

[William]

AASHTA

http://sheldonbrown.com/cribsheet-spacing.shtml#k7fw

[PATRICK MOORE]

Thanks. I should have thought of that. "As always, Sheldon has the answer."

I am not sure how to calculate the space savings from thinner cogs and spacers, and the increase from the additional cog and spacer, but I will work on it. As I said, I've done this before. Must get a battery for my Pep Boys micrometer -- too hard to read the gradations in "analogue" mode. 

One "truc" that I've learned is how hard can you squeeze the plastic spacers to get the lockring to grab the tiny, little, first bit of threading on the hub body. Sometimes a different lockring will grab where another won't: the "Sunrace" lockring in my bag has an extra row of thread compared to the Shimanos, which is sometimes just enough to grab the hub body threading and allow you to squeeze it on and compress the spacers just enough to get non-canonical arrangements to work, as when I spaced out a 7 with two extra spacers at the hub body flange: a bit of leaning while turning was required.

The salient bit of information is the fully 2/3" difference in width between a 5 sp fw (23.2 mm) and a Shimano (40) or Campy (40.1) 11 sp cassette. 

--
You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group.
To view this discussion on the web visit https://groups.google.com/d/msg/rbw-owners-bunch/-/2vDyM6_-Q18J.
To post to this group, send email to rbw-owne...@googlegroups.com.
To unsubscribe from this group, send email to rbw-owners-bun...@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.

[Garth]

read this  part too !

http://sheldonbrown.com/k7.html#custom

The differences of cog width are such that the 7,8 and 9 speed are interchangeable. 
The Miche 8/9 sp. cogs can also be used as 7 sp.
http://harriscyclery.net/itemdetails.cfm?ID=800
http://harriscyclery.net/model-list/miche-b572/cassette-cogs-t705-qc49.htm

Then it really comes down to dialing in the spacers ... and they need not be perfectly precise , with friction at least. From what I've read before though, they not be absolutely precise for indexed either.

ebikestop has the best prices for Miche cogs
http://www.ebikestop.com/miche_shimano_14t_middlefinal_position_cog_89_speed-FW1738.php?cat=1042
http://www.ebikestop.com/cassette_parts_cassette_cogs%29%29443.php

[dougP]

My Atlantis currently has cogs from a 7 speed cassette, 13-28, with a 9 speed 34t big cog, all spaced with 8 speed spacers, shifted with Ultegra 8 speed indexed bar ends.  The whole thing works perfectly, even the indexing, so there's quite a bit of tolerance in this stuff.  I've mixed'n'matched 7 & 8 speed cogs forever with no ill effects.

dougP