Freewheel question

Johnny Two Pedals said:

Scott said:

I've got an older Zipp disc that's threaded for a track cog on one
side, freewheel on the other. I'd like to be able to use it for road
TTs as well as on the track, so I'm curious if anyone's been able to
re-fit an older 8sp freewheel into either a 9 or 10 sp freewheel?

If so, how'd you do it?

thanks,

Scott

Hello???? (knocking on inside of monitor) Sorry to intrude, but you
all seem to be missing something....if the hub is threaded for a track
cog on one side, and for a SINGLE SPEED freewheel on the other, then
the wheel is dished symetrically. Unless you have a novel method of
changing the disc dish, you are sorta stuck with a single speed wheel.

//jtd//

If anyone's missing something, it's you. Don't assume that both sides
are threaded symmetrically.

Have you ever seen an older Zipp disc wheel? They are specifically
designed to take a cog on one side and a freewheel on the other. The
wheel isn't dished at all. The single cog side has the threads moved
WAAAAY out from the center of the wheel to allow for proper chainline,
and the freewheel side has the threads closer to the wheel center-line,
spaced to match any typical threaded hub.

Scott said:

Jacob Stang wrote:

Quoted message said:

Quoted message said:

I have made a 8 speed freewheel with 9 speed spacing form a standard
Shimano 7 speed freewheel. By replacing the lockring with a threaded cog
from a 6 speed uniglide cassette and making new spacers from a sheet of
2.5 mm plexiglass.
With a cog at 1.85 and a spacer at 2.5 you get a cogspacing at 4.35.
I also had to grind down the teeth's on the threaded cog since they where
higher than the teeth's on the hyperglide cog.

Quoted message said:

THANKS... I knew someone out there had to have figured out a way to
make something like this work. Now, if only there was enough demand
for it, Wheels Manufacturing would make a conversion kit.

You should ask them. Maybe it'll put the idea in their heads,
or maybe there is some trickle of people asking them,
that we don't know about.

Ben

Scott said:

Johnny Two Pedals said:

Scott said:

I've got an older Zipp disc that's threaded for a track cog on one
side, freewheel on the other. I'd like to be able to use it for road
TTs as well as on the track, so I'm curious if anyone's been able to
re-fit an older 8sp freewheel into either a 9 or 10 sp freewheel?

If so, how'd you do it?

thanks,

Scott

Hello???? (knocking on inside of monitor) Sorry to intrude, but you
all seem to be missing something....if the hub is threaded for a track
cog on one side, and for a SINGLE SPEED freewheel on the other, then
the wheel is dished symetrically. Unless you have a novel method of
changing the disc dish, you are sorta stuck with a single speed wheel.

//jtd//

If anyone's missing something, it's you. Don't assume that both sides
are threaded symmetrically.

Have you ever seen an older Zipp disc wheel? They are specifically
designed to take a cog on one side and a freewheel on the other. The
wheel isn't dished at all. The single cog side has the threads moved
WAAAAY out from the center of the wheel to allow for proper chainline,
and the freewheel side has the threads closer to the wheel center-line,
spaced to match any typical threaded hub.

With vintage Campy cycling hat in hand, I humbly stand before you and
beg forgiveness. This is what I get for posting prior to having the
first cup of coffee. Please accept my apologies. In my defense, I did
go searching for a picture of the wheel prior to shooting myself in the
foot. Actually, sound like a neat idea to have the flexibility
described.

//jtd//

Johnny Two Pedals said:

Scott said:

Johnny Two Pedals said:

Scott wrote:
> I've got an older Zipp disc that's threaded for a track cog on one
> side, freewheel on the other. I'd like to be able to use it for road
> TTs as well as on the track, so I'm curious if anyone's been able to
> re-fit an older 8sp freewheel into either a 9 or 10 sp freewheel?
>
> If so, how'd you do it?
>
> thanks,
>
> Scott

Hello???? (knocking on inside of monitor) Sorry to intrude, but you
all seem to be missing something....if the hub is threaded for a track
cog on one side, and for a SINGLE SPEED freewheel on the other, then
the wheel is dished symetrically. Unless you have a novel method of
changing the disc dish, you are sorta stuck with a single speed wheel.

//jtd//

If anyone's missing something, it's you. Don't assume that both sides
are threaded symmetrically.

Have you ever seen an older Zipp disc wheel? They are specifically
designed to take a cog on one side and a freewheel on the other. The
wheel isn't dished at all. The single cog side has the threads moved
WAAAAY out from the center of the wheel to allow for proper chainline,
and the freewheel side has the threads closer to the wheel center-line,
spaced to match any typical threaded hub.

With vintage Campy cycling hat in hand, I humbly stand before you and
beg forgiveness. This is what I get for posting prior to having the
first cup of coffee. Please accept my apologies. In my defense, I did
go searching for a picture of the wheel prior to shooting myself in the
foot. Actually, sound like a neat idea to have the flexibility
described.

//jtd//

No worries.

BTW, after reading Jacob's solution, I thought I'd try to modify the
8sp Sachs freewheel I already have. Big problem, though. The
freewheel doesn't use spacers, the individual cogs have a sleeve of
sorts built in to serve as the spacer. I suppose I could take 'em to a
machine shop and have 'em ground down to the appropriate width, and
reassemble the freewheel with an extra spacer of the appropriate width
behind the largest cog, but I'm really beginning to think it's too much
trouble.

Scott said:

BTW, after reading Jacob's solution, I thought I'd try to modify the
8sp Sachs freewheel I already have. Big problem, though. The
freewheel doesn't use spacers, the individual cogs have a sleeve of
sorts built in to serve as the spacer. I suppose I could take 'em to a
machine shop and have 'em ground down to the appropriate width, and
reassemble the freewheel with an extra spacer of the appropriate width
behind the largest cog, but I'm really beginning to think it's too much
trouble.

Really? I never had a Sachs 8sp freewheel, but my recollection
of Sachs 7sp is that the smallest cog screws into the 2nd cog which
screws into the freewheel body, and these both have built-in spacers.
Maybe the 3rd cog also has a built-in spacer. The larger cogs are
flat and there are black or brown plastic spacers between them.

<http://www.bikepro.com/products/freewheels/sachs.html>
It kills me that this catalog is still up, I think the business
has been dead for almost ten years now.

The Shimano freewheels had integrated spacers on the one or two
smallest cogs and the rest were flat with separate spacers.

Ben

Quoted message said:

Scott said:

BTW, after reading Jacob's solution, I thought I'd try to modify the
8sp Sachs freewheel I already have. Big problem, though. The
freewheel doesn't use spacers, the individual cogs have a sleeve of
sorts built in to serve as the spacer. I suppose I could take 'em to a
machine shop and have 'em ground down to the appropriate width, and
reassemble the freewheel with an extra spacer of the appropriate width
behind the largest cog, but I'm really beginning to think it's too much
trouble.

Really? I never had a Sachs 8sp freewheel, but my recollection
of Sachs 7sp is that the smallest cog screws into the 2nd cog which
screws into the freewheel body, and these both have built-in spacers.
Maybe the 3rd cog also has a built-in spacer. The larger cogs are
flat and there are black or brown plastic spacers between them.

<http://www.bikepro.com/products/freewheels/sachs.html>
It kills me that this catalog is still up, I think the business
has been dead for almost ten years now.

The Shimano freewheels had integrated spacers on the one or two
smallest cogs and the rest were flat with separate spacers.

Ben

I haven't taken it apart, so I can't say about whether there are
spacers between the larger cogs. You're probably right. I could
easily see that the smaller cogs didn't have spacers, so I didn't even
bother to pull it apart.

I've thought about buying a Shimano freewheel to tinker with and see if
I can make it work, but it looks like the only one's available now have
that whacky mega-alpine, super wide-spaced gearing. If I could find an
8 sp 12-18 straight block, or 12-21 even, it'd be worth messing with.

To be honest, considering that I suck so badly at time trialling, I'm
thinking I'm better off just using my normal, non-aero race wheels for
the one or two TT's I'll do this year. At least I'll have an excuse
other than, "I suck".

S.

Scott said:

Johnny Two Pedals said:

Scott said:

Johnny Two Pedals wrote:
> Scott wrote:
> > I've got an older Zipp disc that's threaded for a track cog on one
> > side, freewheel on the other. I'd like to be able to use it for road
> > TTs as well as on the track, so I'm curious if anyone's been able to
> > re-fit an older 8sp freewheel into either a 9 or 10 sp freewheel?
> >
> > If so, how'd you do it?
> >
> > thanks,
> >
> > Scott
>
> Hello???? (knocking on inside of monitor) Sorry to intrude, but you
> all seem to be missing something....if the hub is threaded for a track
> cog on one side, and for a SINGLE SPEED freewheel on the other, then
> the wheel is dished symetrically. Unless you have a novel method of
> changing the disc dish, you are sorta stuck with a single speed wheel.
>
> //jtd//

If anyone's missing something, it's you. Don't assume that both sides
are threaded symmetrically.

Have you ever seen an older Zipp disc wheel? They are specifically
designed to take a cog on one side and a freewheel on the other. The
wheel isn't dished at all. The single cog side has the threads moved
WAAAAY out from the center of the wheel to allow for proper chainline,
and the freewheel side has the threads closer to the wheel center-line,
spaced to match any typical threaded hub.

With vintage Campy cycling hat in hand, I humbly stand before you and
beg forgiveness. This is what I get for posting prior to having the
first cup of coffee. Please accept my apologies. In my defense, I did
go searching for a picture of the wheel prior to shooting myself in the
foot. Actually, sound like a neat idea to have the flexibility
described.

//jtd//

No worries.

BTW, after reading Jacob's solution, I thought I'd try to modify the
8sp Sachs freewheel I already have. Big problem, though. The
freewheel doesn't use spacers, the individual cogs have a sleeve of
sorts built in to serve as the spacer. I suppose I could take 'em to a
machine shop and have 'em ground down to the appropriate width, and
reassemble the freewheel with an extra spacer of the appropriate width
behind the largest cog, but I'm really beginning to think it's too much
trouble.

Scott,

I had a Zipp 950 disk that I used on the track for several years AND
used it with an 8 speed STI setup and an 8-speed Sachs freewheel. I
bought a Profile "swingshifter" setup for the end of the aerobars and
left a set of downtube shifters permanently attached. The only thing I
had to do was remove the shiftcables connected to the STI levers and
connect up the longer ones on the swiftshift setup. I left my STI
levers on and attached to the brakes.

It really was quick and rather painless.

Greg Wood