9 spd between 126mm dropouts??
John Olson
trialling. It's got 126mm spacing between the dropouts, and I am wondering
if it is possible to squeeze a 9 speed cassette in there? The reason I am
wondering is that all the Shimano 9 speed road hubs have a spacer (about
5-6mm thick) on the non drive side. If I removed this and replaced it with
a spacer to give the 126 width, it should fit in the dropouts. I realise
that the dishing will be a little more extreme, but she only weighs about
130 lbs and doesn't have the mass, strength, or inclination to push the bike
that hard. Has anyone tried this or seen it work? I don't want to spread
the frame, as the lugs appear to be only bonded, and don't really deserve
such treatment. The LBS says it won't work, they've tried it, but they
won't/can't tell me WHY it won't work. Any suggestions?
John
mailto:John....@tesco.net
PPWrench
a spacer to give the 126 width, it should fit in the dropouts. >>
Quite possible but the 4mm you remove from the left side will result in a
wheel out of dish by the same amount and the bike *may* not be very
stable-redishing that amount(pulling the rim 4mm to the right)will be tuff to
achieve because of the already proper(I hope) tension on the drive side. Just
relaxing tension on the non drive side will not move the rim that far over-may
have a poor wheel as a result.
DON'T cram a 8/9 speed wheel into the drop outs-the drop outs will not be
parallel and the skewer will force them that way, maybe causing a frameset
failure-
What I recommend is just using a 7s wheel spaced to 9s with 9s spacers-won't
have 9speeds but the cogset will work and you won't kill a wheel or a frameset-
peter
Brian Nystrom
John Olson wrote:
If the bike is going to be used strictly for TTs, why would she need more than a
7-speed? A 12-18 cassette should be plenty and will save a few grams, as well.
You could squeeze a 130mm hub in there. Wheel changes would be slow, but it will
work. I wouldn't recommend spreading the rear triangle as cold setting Al is not
a good idea. If you took the 5mm of spacers out of the wheel, the dish would be
so extreme that it's likely the wheel wouldn't last through a time trial. I also
suspect the lack of lateral rigidity would cause brake rub.
--
Regards
Brian
velo_souffrance
whatsoever to put a 9s wheel into a 126-spaced frame (both frames that I did
it with were steel, FWIW, and one has horizontal, the other vertical,
dropouts). One is my #2 road bike, and has seen a ton of use in poor
conditions, and the other is a TT bike where I just wanted more speeds.
What kind of tolerances are bike frames built to, anyhow? -- I mean, by
slightly spreading the dropouts, yes, theoretically you're making
them unparallel, but I can't imagine the amount of non-parallelness is much
above the build tolerances of the frame, axle and skewer. Somebody please
do the math & advise! I'm 6'-2", 180 lbs, again FWIW. (I don't even think
most shops fiddle around
w/the dropout alignment when they re-space/"cold-set" the frame -- they just
ease the
rear triangle open a little more, no?)
PPWrench wrote in message <19990411100559...@ng-fz1.aol.com>...
>J. Olson-"<< If I removed this and replaced it with
>a spacer to give the 126 width, it should fit in the dropouts. >>
>
>
John Forrest Tomlinson
<7eqn6q$q2r$1...@oak.prod.itd.earthlink.net>...
>This advice doesn't square with my experience. I have found it no
problem
>whatsoever to put a 9s wheel into a 126-spaced frame (both frames
that I did
>it with were steel, FWIW, and one has horizontal, the other vertical,
>dropouts). One is my #2 road bike, and has seen a ton of use in poor
>conditions, and the other is a TT bike where I just wanted more
speeds.
>What kind of tolerances are bike frames built to, anyhow? -- I mean,
by
>slightly spreading the dropouts, yes, theoretically you're making
>them unparallel, but I can't imagine the amount of non-parallelness
is much
>above the build tolerances of the frame, axle and skewer.
freewheel hubs, from my experience, it's unwise. I had a frame with a
kind of odd spacing -- about 128 or 129. It was supposed to be 125 or
126 and I often bent Campy six/seven speed axles until I wised up and
put some washers on the axles to make the hub spacing equal the frame
spacing.
JT
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MSchadAPI
>won't/can't tell me WHY it won't work. Any suggestions?
You can't spread anything with any luck except steel, and even steel should be
cold set so the dropouts are aligned. This is not my opinion, it is fact handed
to me by professional framebuilders. I was unaware of the spacers though, if
you could remove or replace it/them you may have your answer. However, it would
seem to me that the spacrs are there for a reason. Make sure removeing them
wont cause problems( driveline problems, cog rub on stay, etc.). If you can't
work something out with the spacers, forget the spreading idea.
PPWrench
do the math & advise >>
The 'math' is that in a LBS, you do this and break a frameset and you pay for
it-not worth it IMO-particularly on a 'screwed and glued' non fixable frameset
like a Vitus-
I suspect that the framesets you are using are not really 126mm, but closer to
128 or so-steel can be set to 130mm easily-
peter
PPWrench
most shops fiddle around
w/the dropout alignment when they re-space/"cold-set" the frame -- they just
ease the
rear triangle open a little more, no?) >>
NO-a good shop will spead the drop-outs, align the frameset rear triangle and
then use a drop-out gauge/tool to ensure the drop-outs are parallel-
Peter
ProPeloton
Alex Rodriguez
says...
>The 'math' is that in a LBS, you do this and break a frameset and you pay for
>it-not worth it IMO-particularly on a 'screwed and glued' non fixable frameset
>like a Vitus-
I owned a vitus and it was not screwed, just glued. Also Harry H in PA can
fix the frame.
-----------------
Alex __O
_-\<,_
(_)/ (_)
Paul Kopit
the wheel to 128 mm, put an 8/9 sp hub body on and drop on the 9sp
cassette. You'll also need the 9sp chain and shifter. You probably
will not need a new axel.
If you want to go step wise. Buy a 105 9sp cassette, the shifters and
chain. Leave your wheel alone. Put 8 of the cogs on the 7sp hub
body.
On Sun, 11 Apr 1999 13:55:15 +0100, "John Olson"
<John....@tesco.net> wrote:
>My girlfriend has a lovely Vitus 979 frame that she wants to use for time
>trialling. It's got 126mm spacing between the dropouts, and I am wondering
>if it is possible to squeeze a 9 speed cassette in there? The reason I am
>wondering is that all the Shimano 9 speed road hubs have a spacer (about
>5-6mm thick) on the non drive side. If I removed this and replaced it with
>a spacer to give the 126 width, it should fit in the dropouts. I realise
>that the dishing will be a little more extreme, but she only weighs about
>130 lbs and doesn't have the mass, strength, or inclination to push the bike
>that hard. Has anyone tried this or seen it work? I don't want to spread
>the frame, as the lugs appear to be only bonded, and don't really deserve
>such treatment. The LBS says it won't work, they've tried it, but they
>won't/can't tell me WHY it won't work. Any suggestions?
>
>John
>mailto:John....@tesco.net
>
>
JV
that would automatically spread a 126mm to 130mm when you put the wheel
on. It may (or may not) be a uniglide hub which would require you to get
a hyperglide hub-body, but it will work with 9-speed. You may even be
able to get those rounded-nuts, however, I don't know the part number.
Good luck!
-Jason
Terrapin
ton of people this very delima. Bottom line is cold-setting a steel
frame is the prescribed way to do this. This is done by a frame builder /
repair. But we sure don't live in a perfect world, do we?
I crashed my wheel recently. Asked myself "should I respoke this
hub...again?? Or get an 8 speed system?? " I borrowed my friend's 8
speed wheel and I swear my bike cornered better. I found a deal on a set
of wheels in rec.bicycles.marketplace. I don't think spreading a steel
frame 2mm on each side of the dish matters that much either.
What I plan to do is just put a new 8 speed wheel in there; nothing
modified. Again, all of this applies to steel. Defiently wouldn't do
this with glued tubes though; which I think I remeber that the Vitus is,
right?? Wouldn't do this with carbon fiber either.
Hope this helps-
David,
California.
__o "Every time that wheel turns round...
_\ <_ ...bound to cover just a little more ground."
(_)/ (_) -Hunter & Garcia
Please be kind to cyclists!!! :) :)