| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 2400.1 | KEEP LOOKIN' | WMOIS::GIROUARD_C | | Mon Aug 31 1992 07:41 | 5 |
| That's strange...I can get Campy cogs and the That stuff is not easy
to get (indivudally). Try some non-local bike shops, e.g. Gamache's,
"let your fingers do the walking..." They should be available.
Chip
|
| 2400.2 | | PIPPER::GOOD | | Mon Aug 31 1992 09:18 | 5 |
|
Try Landry's in Westboro. I have purchased them there recently.
They had what was needed in stock.
Roger
|
| 2400.3 | proceed with caution | TFH::REED | | Thu Sep 03 1992 15:29 | 9 |
| Are you sure that you would like individual cogs. When I first started
with hyperglide cassettes I beleived that I could mix and match my own
combinations. In reality the cogs are cut according to the cassette
they are meant for. Although some cogs are common to several cassettes
many are unique. For instance, the 15T cog on a 12-21 is not the same
as the 15T on a 13-23 nor as on on a 13-26.
beware !
Ken
|
| 2400.4 | I can confirm for 7-spd. | ODIXIE::RRODRIGUEZ | Where's that Tour d' France thang? | Thu Sep 03 1992 16:05 | 11 |
| Yeah, I've got D/A seven speed and one 15T has a fused spacer and
the other 15T does not. It depends on whether you put a 15T in the
second "slot" or not. I don't know if you can get an "add-on"
spacer of that diameter or why you would try. It helps to draw a
diagram for the bike mechanic.
The fourteen-tooth as far as I know, only comes in one design. It
must be next to the threaded end cog, whether it is a 12T or 13T.
I imagine 8-spd would allow for a 12/19 block though.
r�
|
| 2400.5 | LIKE NEW ENGLAND WEATHER... | WMOIS::GIROUARD_C | | Fri Sep 04 1992 07:20 | 6 |
| That's Shimano for ya... They rev stuff more often than DEC
software!
:-)
|
| 2400.6 | | PIPPER::GOOD | | Fri Sep 04 1992 10:03 | 7 |
|
RE-1
I think that -2 is inaccurate. I don't see a problem
swapping cogs on Shimano. If anyone needs help on this and you are
near Marlboro MA send me mail. You need a couple of tools to do it.
Roger
|
| 2400.7 | I imagine 8-spd is the same | ODIXIE::RRODRIGUEZ | Where's that Tour d' France thang? | Fri Sep 04 1992 10:37 | 19 |
| It's not a matter of compatability. Like most freehub bodies, the
part closest to the threads is a narrower diameter than the part
closer to the hub. Therefore, the _two_ outermost cogs must have
a smaller _interior_ diameter to fit. The reason the 15T is tricky
is because sometimes people make it the the second, 13-15-16-17...
and sometimes the make it the third 13-14-15-16... and the "step"
on the freehub body diameter occurs right there.
No matter what the second cog size you choose, 13,14, or 15, it
will come with a metal spacer fused to it. The add-on spacers are
either metal or nylon. I think Shimano does it that way because
when you are threading the end-cog on, the first spacer gets the
brunt of the torque and must have more "heft" for the long haul.
It's not as complicated as it sounds. I've never given it a thought
until it came up here.
R�
|
| 2400.8 | | PIPPER::GOOD | | Fri Sep 04 1992 12:36 | 5 |
|
Are you referring to hyperglide casstettes? That may be the source
of my confusion.
Roger
|
| 2400.9 | Wish I could draw a picture... | ODIXIE::RRODRIGUEZ | Where's that Tour d' France thang? | Fri Sep 04 1992 14:30 | 24 |
| Nope. The regular twisty-tooth non-hyperglide that you slide
down the freehub (except for the threaded one, of course).
Unlike the loose, "add-on" spacers, the fifteen tooth's spacer
is "notched" along the inside to help the whole thing "stay-put".
These "notches" are facing the hub-side. If you used a regular
spacer and 15T, it would fall off.
7 6 5 4 3-2 1 Note: 15T "hangs" over narrow end slightly;
bbbbbbbbbb a normal cog would be very unstable
bttt because a fused spacer makes the cog
<HUB bttt effectively wider.
bttt
bbbbbbbbbb c
c cogs without
b= Freewheel Body ssc spacers have
t= Narrow threaded end ssc a it added to
c=cog ssc the opposite
ssc side; except
s=spacer ssc for no.3 which
c wouldn't need
c one because of
no.2's (15T).
|
| 2400.10 | keep hypergliding ! | TFH::HERBIE::REED | | Fri Sep 04 1992 16:18 | 49 |
| I Have HG90 cassettes on my Ultegra 600 8 speed equipped bike. On
this freehub it does not have a step and the outermost cog is not
threaded. The innermost 6 cogs are fastened together with three small
diameter hex head machine screws with spacers between them. The next
two cogs have the spacer cast on to the cogs. The whole assembly is
fastened onto the freehub with a very thin threaded lock-ring. I
expect other cassettes are different. But you were referring to HG90's
I believe. I expect others are different. When you purchase a cassette
it's cog combinations are indicated by a letter appended to the part
number. A 12-21 is an S, a 13-23 is a T and a 13-26 is a V. The cogs
that comprise the cassette must have the letter in their part number.
Although you the wrong cog will easily assemble to your freehub it will
degrade how well it shifts. If you dissassemble two cassettes that
have some cog sizes in common you will find that the teeth are shaped
differently and/or oriented to the index tab differently. The numbers
stamped on the cogs indicate which cog they are suitable for. A 14T
cog on the 12-21 cog is 14T-s-u indicating that it is cut for the
12-21 (s) or the 12-23 (u) cassette. Inspecting a 14T on a 13-26 cassette
reveals that it is marked 14T-t-v since it is used on the 13-23 (t) or
the 13-26 (v) cassettes.
The following table list the cogs that comprise 4 of the HG90
cassettes
S T U V
12-21 13-23 12-23 13-26
----- ----- ----- -----
12T-s-u 12T-s-u
13T-s-u 13T-t-v 13T-s-u 13T-t-v
14T-s-u 14T-t-v 14T-s-u 14T-t-v
15T-s 15T-t 15T-? 15T-v
16T-s-t 16T-s-t
17T-s-t 17T-s-t 17T-u-v-w 17T-u-v-w
19T-s 19T-t 19T-u-v-w 19T-u-v-w
21T-s-t 21T-s-t 21T-? 21T-v-w
23T-t 23T-u-v-w 23T-u-v-w
26T-v
I don't have the 'u' cassette so it's cogs are a conclusion on my part.
So, if one expects to convert a 12-21 cassette to a 13-23 you can
expect to buy at least 2 cogs if you don't care about smooth shifting.
One 14T since the 12-21 14T is clustered with 6 others and you need a
slide on, and a 23T of course. On the other hand if you would like to
keep your hyperglide shift feel you will be buying 5 cogs. A
questionable frugality since a whole cassette can be had from Colorado
Cyclist for about $28.
Best of Luck
Ken
|
| 2400.11 | some assembly required | TFH::HERBIE::REED | | Fri Sep 04 1992 16:39 | 15 |
| I may not have been clear how it assembles. The 6 largest cogs are
fastened together by machine screws to form the 'cassette'. This
assembly is not normally taken apart. It is slid onto the freehub
first. Then each of the two smaller cogs are slide on ( with their
integral spacers ). Then the locking ring is spun on and torqued down
with the so called 'freewheel tool'.
Assembly requires a wrench ( adjustable 'crescent' will do ) and the
'freewheel tool'. Add a chain whip for holding the freewheel still for
removing the cassette. The whole thing takes about 5 minutes including
removing and replacing the wheel from the bike. This is great for
changing the cassettes between hilly training rides and fast races.
Ken
|