rear hub question

Are all 8-speed shimano-type rear hubs 9-speed compatible?

All the Shimano hubs listed on SJS cycles website are described as 8/9 speed
compatible (apart from one XTR hub). Is this because 9-speed cassettes are
backwards compatible with 8-speed hubs?

?

Simonb

Tony Raven wrote:

According to the Oracle "Shimano 8- and 9-speed hubs and cassettes
are fully interchangeable with one another, so any 8-speed hub can be
a 9-speed, or vice-versa." http://www.sheldonbrown.com/k7.html

Tony

Great!

Thanks.

Simonb wrote:
Are all 8-speed shimano-type rear hubs 9-speed compatible?

All the Shimano hubs listed on SJS cycles website are described as
8/9 speed compatible (apart from one XTR hub). Is this because
9-speed cassettes are backwards compatible with 8-speed hubs?

?

Simonb

The sprocket spacing is narrower on a 9-speed so the nine sprockets on a 9
speed occupy the same width as the eight on an 8-speed. One needs the
correct shifter to move the mech the correct distance so it remains
correctly aligned under each sprocket.

Seven speed has the same spacing as 8 speed so an eight speed is wider than
a seven, though as Sheldon Brown points out 8 sprockets from a nine speed
cassette can be used to make a 8 speed cassette to fit on a 7 speed
compatible hub using a nine speed chain and shifters.

M Series wrote:
The sprocket spacing is narrower on a 9-speed so the nine sprockets
on a 9 speed occupy the same width as the eight on an 8-speed. One
needs the correct shifter to move the mech the correct distance so it
remains correctly aligned under each sprocket.

Seven speed has the same spacing as 8 speed so an eight speed is
wider than a seven, though as Sheldon Brown points out 8 sprockets
from a nine speed cassette can be used to make a 8 speed cassette to
fit on a 7 speed compatible hub using a nine speed chain and shifters.

Thanks again.

I now have 9-speed everything on the bike, apart from the cassette. As it
is, one gear has to be fudged; I have to change twice to shift properly to
and from that gear. This works, but it is not satisfactory.

Ta.

"Simonb" sbennettatwiderworlddotcodotuk wrote in message
. ..
M Series wrote:
The sprocket spacing is narrower on a 9-speed so the nine sprockets
on a 9 speed occupy the same width as the eight on an 8-speed. One
needs the correct shifter to move the mech the correct distance so it
remains correctly aligned under each sprocket.

Seven speed has the same spacing as 8 speed so an eight speed is
wider than a seven, though as Sheldon Brown points out 8 sprockets
from a nine speed cassette can be used to make a 8 speed cassette to
fit on a 7 speed compatible hub using a nine speed chain and shifters.

Thanks again.

I now have 9-speed everything on the bike, apart from the cassette. As it
is, one gear has to be fudged; I have to change twice to shift properly to
and from that gear. This works, but it is not satisfactory.

Ta.


Buy a nine speed cassette then !

Graham

Simonb wrote:

Are all 8-speed shimano-type rear hubs 9-speed compatible?

All the Shimano hubs listed on SJS cycles website are described as 8/9 speed
compatible (apart from one XTR hub). Is this because 9-speed cassettes are
backwards compatible with 8-speed hubs?

Bah! Now you've tempted me to convert my tourer to 27 speed.