shimano IG chain

In article <[email protected]>, [email protected]
(Kelling) wrote:

> hi,
>
> i bought a new crank for my old mountain bike, and on the large chainring it says: "shimano IG
> chain only"
>
> how critical is this? i don't know what kind of chain it is, but it's new enough (barely
> stretched at all going by the 12" link to link check) that i'd rather not buy a new chain if i
> don't have to.
>
> is there some simple articulation of what my chain should or should not look like in order for it
> to be compatible? or is there something on my old crank i should look for? my old crank has 'flat'
> chainrings - no 'ramps' for quicker shifting. the new cranks' chainrings have these 'ramps'. the
> chain came off of a bike with 'ramps' and worked fine as far as i know.
>
> is the IG refering to those 'ramps'?

Ah Interactive Glide, we harly knew ye.

IG was a successor to Hyperglide, with ramp cuts on both sides of the sprocket:

http://www.sheldonbrown.com/k7.html#interactive

IG has quietly disappeared from the current offerings, but for most puposes, it is compatible with
HG stuff, and by extension with most current aftermarket chains (SRAM, Taya, etc.).

I wouldn't worry about it; as long as you have a Hyperglide cassette now, your front shifting
should be fine.

--
Ryan Cousineau, [email protected] http://www.sfu.ca/~rcousine President, Fabrizio Mazzoleni Fan Club

Kelling <[email protected]> wrote:
: hi,

: i bought a new crank for my old mountain bike, and on the large chainring it says: "shimano IG
: chain only"

: how critical is this? i don't know what kind of chain it is, but it's new enough (barely
: stretched at all going by the 12" link to link check) that i'd rather not buy a new chain if i
: don't have to.

IG front rings don't care what chain is on them. They work fine. I use a cheap pc48 Sram chain
(10.00) on my old Trek 930 with STX IG rings and it works fine.

--------------------------------
Bob Masse' [email protected]
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