Shimano CS-HG70-9 Cassette

[Jimbob]

Would Shimano LX CS-HG70-9 (11-32) be a direct replacement for CS-HG70-9 (12-25) in terms
of fitting?

 

[Just Zis Guy]

JimBob wrote:
> Would Shimano LX CS-HG70-9 (11-32) be a direct replacement for CS-HG70-9 (12-25) in terms of
> fitting?

Should be. The LX mech is rated 34T. Just check that the overall capacity is not exceeded (and then
forget about it because you never run big-small or small-big anyway)

--
Guy
===
I wonder if you wouldn't mind piecing out our imperfections with your thoughts; and while you're
about it perhaps you could think when we talk of bicycles, that you see them printing their proud
wheels i' the receiving earth; thanks awfully.

http://www.highwaycode.gov.uk/09.shtml#103 http://www.highwaycode.gov.uk/09.shtml#104

 

[Simon Ward]

JimBob <[email protected]> wrote:
> Would Shimano LX CS-HG70-9 (11-32) be a direct replacement for CS-HG70-9 (12-25) in terms of
> fitting?
Yes - did exactly that swap not that long ago (and after a ride in a howling gale yesterday, I'm
very glad I did). Just make sure your rear mech will cope with the large sprocket. I'm using an XT
rear mech, but any long-cage derailleur should work.

Simon
--
Simon Ward, Accent Optical Technologies (UK) Ltd., York, YO31 8SD, UK "Perl is the ideal tool for
the inspired slacker who'd rather sing and dance than spend longer than they need to at work ..."
- http://www.perl.com/pub/a/2002/12/18/hohoho.html

 

[Colin]

"JimBob" <[email protected]> wrote in message
news:<[email protected]>...
> Would Shimano LX CS-HG70-9 (11-32) be a direct replacement for CS-HG70-9 (12-25) in terms of
> fitting?

I was looking into cassette hubs recently. If your hub body is of a recent type, called Hyperglide
C, then you can replace the cassette directly. If it isn't, you need to put a thin spacer on the hub
to allow the 11 tooth sprocket to clear the end of the splines.

http://www.sheldonbrown.com/k7.html explains the different types of hub bodies.

Other people have mentioned your derailleur. I didn't see you mention what type you have, but the
cage length doesn't determine the largest sprocket you can use. Mountain bike derailleurs have more
slope in the parallelogram than road bike derailleurs, allowing the cage to clear a larger sprocket.
The length of the cage determines the amount of chain slack the derailleur can take up. You will
probably need to use a mountain bike derailleur with a 32 tooth sprocket, and you must make sure
your chain is long enough.

Colin

 

[Jimbob]

"JimBob" <[email protected]> wrote in message
news:[email protected]...
> Would Shimano LX CS-HG70-9 (11-32) be a direct replacement for CS-HG70-9 (12-25) in terms of
> fitting?

Sorry forgot to mention - I am using 105 throughout. The rear derailleur is 5500 GS (for a triple)
with capacity of 37T.

The largest sprocket quoted is 27T - is this non-negotiable?

Cheers

 

[Just Zis Guy]

Colin wrote:

> I was looking into cassette hubs recently. If your hub body is of a recent type, called Hyperglide
> C, then you can replace the cassette directly. If it isn't, you need to put a thin spacer on the
> hub to allow the 11 tooth sprocket to clear the end of the splines.

I thnk my 11-32 cassette came with the spacer included, but ICBW. I'll check when I get a minute.

--
Guy
===
I wonder if you wouldn't mind piecing out our imperfections with your thoughts; and while you're
about it perhaps you could think when we talk of bicycles, that you see them printing their proud
wheels i' the receiving earth; thanks awfully.

http://www.highwaycode.gov.uk/09.shtml#103 http://www.highwaycode.gov.uk/09.shtml#104

 

[Andymorris]

JimBob wrote:
> Sorry forgot to mention - I am using 105 throughout. The rear derailleur is 5500 GS (for a triple)
> with capacity of 37T.
>
> The largest sprocket quoted is 27T - is this non-negotiable?
>

You may get a little more by screwing in the b-screw lots. It depends a bit on your dropout layout
and the phase of the moon.

--
Andy Morris

AndyAtJinkasDotFreeserve.Co.UK

Love this: Put an end to Outlook Express's messy quotes
http://home.in.tum.de/~jain/software/oe-quotefix/

 

[Colin]

"JimBob" <[email protected]> wrote in message
news:<[email protected]>...
> Sorry forgot to mention - I am using 105 throughout. The rear derailleur is 5500 GS (for a triple)
> with capacity of 37T.
>
> The largest sprocket quoted is 27T - is this non-negotiable?

I think 32 might be too much. However if you have 105 cranks I think it's unlikely you'll need an 11
tooth sprocket. Maybe you could use a 12-27 cassette and replace the smallest chainring with a 26,
which gives you nearly the same low gear?

Colin