rear hub question

Simonb said:

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?

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."
sheldonbrown.comk7.htmlOpen ↗

Tony

--
"If you tell the truth you don't have to remember anything." Mark Twain

Tony Raven said:

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."
sheldonbrown.comk7.htmlOpen ↗

Tony

Great!

Thanks.

Simonb said:

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 said:

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
"]news:[email hidden]...

Quoted message said:

M Series said:

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

Graham said:

Buy a nine speed cassette then !

Uh huh. I just wanted to check whether I also needed to buy a new hub. Now I know that I
needn't bother.

That's the beauty of URC.

Simonb

Simonb said:

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.