Adding 30T cog to Ultegra cassette

[[email protected]]

I have a Shimano Ultegra 9sp cassette, 12-27. I would like to add a
loose 30T cog and remove the 14T cog, to make a 12-30. If I use an LX
cog, will this still shift ok?
Would a 30T Sram cog work, too?

Thanks.

 

[Booker C. Bense]

In article <[email protected]>,
[email protected] <[email protected]> wrote:
>I have a Shimano Ultegra 9sp cassette, 12-27. I would like to add a
>loose 30T cog and remove the 14T cog, to make a 12-30. If I use an LX
>cog, will this still shift ok?

Yes. It works just fine. see www.sheldonbrown.com for this and
many other possible gear tweaks you can do with 9spd.

>Would a 30T Sram cog work, too?
>

I dunno, never tried that.

_ Booker C. Bense

 

[Hank Wirtz]

On Apr 19, 10:53 am, Booker C. Bense <bbense+rec.bicycles.tech.Apr.
[email protected]> wrote:
> In article <[email protected]>,
>
> [email protected] <[email protected]> wrote:
> >I have a Shimano Ultegra 9sp cassette, 12-27. I would like to add a
> >loose 30T cog and remove the 14T cog, to make a 12-30. If I use an LX
> >cog, will this still shift ok?
>
> Yes. It works just fine. seewww.sheldonbrown.comfor this and
> many other possible gear tweaks you can do with 9spd.
>
> >Would a 30T Sram cog work, too?
>
> I dunno, never tried that.
>
> _ Booker C. Bense

SRAM cogs are thicker and use thinner spacers. If you're just adding
one at the end, it would probably work fine, but the transition from
the 21-24-27 spider on the Ultegra cassette to the loose 30T might be
odd, as would the 13-15 shift, with the ramps not aligned. Most people
probably wouldn't notice, but some would.

I say this as the guy who alternates thin SRAM spacers with thick
Miche spacers to get something approximating Campy spacing on a SRAM
MTB cassette on his touring bike.

 

[Joel]

I did exactly that on my tandem and it works fine.
I bought the 30T shimano cog from Harris Cyclery.

Joel

 

[[email protected]]

On Apr 19, 2:50 pm, Hank Wirtz <[email protected]> wrote:
> On Apr 19, 10:53 am, Booker C. Bense <bbense+rec.bicycles.tech.Apr.
>
>
>
>
>
> [email protected]> wrote:
> > In article <[email protected]>,
>
> > [email protected] <[email protected]> wrote:
> > >I have a Shimano Ultegra 9sp cassette, 12-27. I would like to add a
> > >loose 30T cog and remove the 14T cog, to make a 12-30. If I use an LX
> > >cog, will this still shift ok?
>
> > Yes. It works just fine. seewww.sheldonbrown.comforthis and
> > many other possible gear tweaks you can do with 9spd.
>
> > >Would a 30T Sram cog work, too?
>
> > I dunno, never tried that.
>
> > _ Booker C. Bense
>
> SRAM cogs are thicker and use thinner spacers. If you're just adding
> one at the end, it would probably work fine, but the transition from
> the 21-24-27 spider on the Ultegra cassette to the loose 30T might be
> odd, as would the 13-15 shift, with the ramps not aligned. Most people
> probably wouldn't notice, but some would.
>
> I say this as the guy who alternates thin SRAM spacers with thick
> Miche spacers to get something approximating Campy spacing on a SRAM
> MTB cassette on his touring bike.- Hide quoted text -
>
> - Show quoted text -

You're saying that an Sram cassette won't work with Campy shifters?
My understanding is that Shimano 9sp cassettes work just fine with
Campy 9sp shifters, so wouldn't Sram work, too?

 

[Hank Wirtz]

On Apr 20, 4:10 am, "[email protected]" <[email protected]> wrote:
> On Apr 19, 2:50 pm, Hank Wirtz <[email protected]> wrote:
>
>
>
> > On Apr 19, 10:53 am, Booker C. Bense <bbense+rec.bicycles.tech.Apr.
>
> > [email protected]> wrote:
> > > In article <[email protected]>,
>
> > > [email protected] <[email protected]> wrote:
> > > >I have a Shimano Ultegra 9sp cassette, 12-27. I would like to add a
> > > >loose 30T cog and remove the 14T cog, to make a 12-30. If I use an LX
> > > >cog, will this still shift ok?
>
> > > Yes. It works just fine. seewww.sheldonbrown.comforthisand
> > > many other possible gear tweaks you can do with 9spd.
>
> > > >Would a 30T Sram cog work, too?
>
> > > I dunno, never tried that.
>
> > > _ Booker C. Bense
>
> > SRAM cogs are thicker and use thinner spacers. If you're just adding
> > one at the end, it would probably work fine, but the transition from
> > the 21-24-27 spider on the Ultegra cassette to the loose 30T might be
> > odd, as would the 13-15 shift, with the ramps not aligned. Most people
> > probably wouldn't notice, but some would.
>
> > I say this as the guy who alternates thin SRAM spacers with thick
> > Miche spacers to get something approximating Campy spacing on a SRAM
> > MTB cassette on his touring bike.- Hide quoted text -
>
> > - Show quoted text -
>
> You're saying that an Sram cassette won't work with Campy shifters?
> My understanding is that Shimano 9sp cassettes work just fine with
> Campy 9sp shifters, so wouldn't Sram work, too?

It does, if you center the adjustment on the middle cog and keep
everything really clean. I often fail on the latter, so I experimented
with the spacers and it hits the ends a little easier this way.