down grading from 7 spd to 6 spd

Zyggy Wrote:
I have an old 7 spd Ultegra non-cassette hub and I would like to change
the
rear wheel to a 6 spd disk for time trialing. Is it possible to make
the
drivetrain compatible to the disk wheel? With minimal effort and cost,
'cause I know with a lot of effort and a lot of money anything is
possible

Thanx

If your rear shifter has friction mode you should be OK.


--
daveornee

Zyggy wrote:

I have an old 7 spd Ultegra non-cassette hub and I would like to change the
rear wheel to a 6 spd disk for time trialing. Is it possible to make the
drivetrain compatible to the disk wheel? With minimal effort and cost,
'cause I know with a lot of effort and a lot of money anything is possible

Pretty much any hub that will work with a 6-speed freewheel will also
work with a 7-speed freewheel. Although there's one more sprocket, the
spacing between them is tighter, so the overall width is very nearly the
same.

See: http://sheldonbrown.com/harris/freewheels

Sheldon "Odd Numbers Are Better" Brown
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Harris Cyclery, West Newton, Massachusetts
Phone 617-244-9772 FAX 617-244-1041
http://harriscyclery.com
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Sheldon Brown wrote in message ...

Pretty much any hub that will work with a 6-speed freewheel will also
work with a 7-speed freewheel. Although there's one more sprocket, the
spacing between them is tighter, so the overall width is very nearly the
same.

What? But I want a wide ratio compact six.
TJ

I wrote:

Pretty much any hub that will work with a 6-speed freewheel will also
work with a 7-speed freewheel. Although there's one more sprocket, the
spacing between them is tighter, so the overall width is very nearly the
same.

Trevor Jeffrey caviled:

What? But I want a wide ratio compact six.

"Compact" or "Ultra" 6 speed freewheels are quite unccommon, they were
made to allow 6 sprockets to be fit onto a 120 mm (5 speed) hub.

See: http://sheldonbrown.com/harris/freewheels.html#6u

The original poster had some kind of a disc wheel. I've never heard of
a 120 mm disc wheel, I'm pretty sure he has a 126 hub with a standard 6
freewheel, and I advised him accordingly.

_Wide-ratio_ Ultra 6 freewheels have a reputation for very poor shifting
performance, and are not generally available any more. 120 hubs have
been obsolete for about 25 years.

Sheldon "All Generalizations Are False" Brown
+----------------------------------------------------+
| A little inaccuracy sometimes saves tons of |
| explanation. --H.H.Munro ("Saki")(1870-1916) |
+----------------------------------------------------+
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

on 8/4/2004 11:30 AM Sheldon Brown said the following:

Pretty much any hub that will work with a 6-speed freewheel will also
work with a 7-speed freewheel. Although there's one more sprocket, the
spacing between them is tighter, so the overall width is very nearly the
same.

If the overall width is nearly the same, can I assume a 6-speed friction
shifter would have enough reach to cover the 7-speed freewheel?

David
dja dot mail at comcast dot net

_Wide-ratio_ Ultra 6 freewheels have a reputation for very poor shifting
performance, and are not generally available any more. 120 hubs have
been obsolete for about 25 years.


Obsolete? That is a harsh word. "Superseded" may have been a better
choice.
As for the freewheel. Do you think he reputation was well founded?
TJ