Shimano cassette replacement IG and HG?

[Bulter9090]

After the chain broke on my 21 speed 1996 bike I replaced it only to find the chain now slips
when in the 4th - 7th rear gears. After doing some research I understand this is a common problem
when the chain is replaced it no longer fits the worn rear cogs (my bike's probably done 4000
miles or so).

So I try to find a replacement for the shimano IG 2 cassette that I have but but no one can now
supply me with one as it's too old. It's been suggested that I replace it with a HG one. As a newbie
I would like somebody to confirm that this will be compatible with my IG derailleurs and front chain
rings before I start buying the tools and HG cassette.

Thanks for any help.

 

[Brian Huntley]

bulter9090 wrote:
> After the chain broke on my 21 speed 1996 bike I replaced it only to find the chain now slips
> when in the 4th - 7th rear gears. After doing some research I understand this is a common problem
> when the chain is replaced it no longer fits the worn rear cogs (my bike's probably done 4000
> miles or so).
>
> So I try to find a replacement for the shimano IG 2 cassette that I have but but no one can now
> supply me with one as it's too old. It's been suggested that I replace it with a HG one. As a
> newbie I would like somebody to confirm that this will be compatible with my IG derailleurs and
> front chain rings before I start buying the tools and HG cassette.

HG Sprockets are thinner, and 'modern' chains take that into consideration according the
manufacturers' bumf. Spacing is the same. You'd have more problems sticking with IG parts than
switching to HG, most likely.

 

[Mike S.]

"bulter9090" <[email protected]> wrote in message news:[email protected]...
>
> After the chain broke on my 21 speed 1996 bike I replaced it only to find the chain now slips when
> in the 4th - 7th rear gears. After doing some research I understand this is a common problem when
> the chain is replaced
it
> no longer fits the worn rear cogs (my bike's probably done 4000 miles or so).
>
> So I try to find a replacement for the shimano IG 2 cassette that I have
but
> but no one can now supply me with one as it's too old. It's been
suggested
> that I replace it with a HG one. As a newbie I would like somebody to confirm that this will be
> compatible with my IG derailleurs and front
chain
> rings before I start buying the tools and HG cassette.
>
> Thanks for any help.
>
I haven't done it, but I've heard that you can use HG cogs on UG hubs. If I remember the thread, you
have to file one of the splines on the cogs to make them fit your UG hub. You probably haven't worn
out your small cog, so you can probably use it as the lockring again.

There was a thread either here or rec.bicycles.misc about someone that did the conversion. You may
want to do a google search for the entire discussion.

Mike

 

[Bulter9090]

> I haven't done it, but I've heard that you can use HG cogs on UG hubs. If
I
> remember the thread, you have to file one of the splines on the cogs to
make
> them fit your UG hub. You probably haven't worn out your small cog, so
you
> can probably use it as the lockring again.
>
> There was a thread either here or rec.bicycles.misc about someone that did the conversion. You may
> want to do a google search for the entire discussion.
>
> Mike
>
>

Thanks for the replies. As a newbie I'm a little confused - whats the difference between IG (mine),
HG and UG? And which is compatible with IG? If it comes down to manually filing cogs then I think
I'm out of my depth

 

[A Muzi]

"bulter9090" <[email protected]> wrote in message news:%[email protected]...

> Thanks for the replies. As a newbie I'm a little confused - whats the difference between IG
> (mine), HG and UG? And which is compatible with IG? If it comes down to manually filing cogs
> then I think I'm out of my depth

You can drop on an IG or HG casette directly with no modification. If an HG, keep one spacer from
your old set and install it on the body before your new HG cassette set. ( IG bodies are slightly
longer due to the specially shaped 11t cog).

It's unlikely you will find a UG csassette without specifically seeking it. They are uncommon. They
are notable inthatthe last cog screws directly to the body with no lockring.

HG and IG cassettes have one spline larger than the others so they will install only one way. Lube
the lockring thread and look at the torque rating stamped right on its face. You cannot screw this
up. Go for it!
--
Andrew Muzi http://www.yellowjersey.org Open every day since 1 April 1971