Help me find a chainring, Shimano 1990s compact drive

[Max Mudroom]

Hi
I have just acquired a bike with an STX chainset circa 1995, the cranks and inner/middle rings are fine but the outer ring is worn badly. I was going to live with it because it is that shiny nickel colour and it rides OK if you take it gently. But if I put power through the cranks it randomly throws the chain, which has resulted in some embarrassing near-fail moments and bashed knees, so I need a new one.

Correct me if I'm wrong but I have worked out that I need a five-arm, 42t 94 BCD outer chainring.

I have found a couple of TA chainrings online that might fit but they seem mighty expensive. Any ideas where I can get something more affordable? Is there a shop that does NOS or is it just a case of waiting until some old stuff comes up on eBay? If so I might have to buy knee pads

At the moment I'm considering using a cheap modern chainset but I don't really want to do that as it will spoil the look of the bike.

Any advice welcome...

 

[legrandefromage]

I'll have a rummage - I might have another nickle STX outer

 

[Max Mudroom]

Re:

That would be cool, thanks.

 

[hamster]

Got a brushed silver Suntour one if you are desperate. The TA ones are expensive, but they outlast a Shimano one 2-3 times over.

 

[marc two tone]

Re:

Check if it's the chainrings that are either...

regular single ones, where the outer and middle fix either side of spider, small ring separate.

or, the odd-ball stx where the the outer and middle are bolted together and with 5 long bolts they all fix to cranks together.

Confused? I am too, but you will see what i mean if you dismantle it all.

 

[secret_squirrel]

Re: Re:

or, the odd-ball stx where the the outer and middle are bolted together and with 5 long bolts they all fix to cranks together.

That's the one pace made the adaptor for to fit standard compact rings right? Coz they end up being within a hairs breadth of the weight if that years XTR cranks.

 

[legrandefromage]

I have the oddball nickleback plated stx ring.

 

[Max Mudroom]

Re: Re:

Check if it's the chainrings that are either...

regular single ones, where the outer and middle fix either side of spider, small ring separate.

or, the odd-ball stx where the the outer and middle are bolted together and with 5 long bolts they all fix to cranks together.

It is oddball but not as you describe. The outer and middle rings connect to the spider through the same bolt - pretty standard. The inner ring is the odd bit because it is carried directly on the middle ring with a separate bolt; it's not connected to the spider.

Haven't dismantled it yet but the outer ring looks pretty standard to me.

 

[secret_squirrel]

Re: Re:

It is oddball but not as you describe. The outer and middle rings connect to the spider through the same bolt - pretty standard. The inner ring is the odd bit because it is carried directly on the middle ring with a separate bolt; it's not connected to the spider.

Haven't dismantled it yet but the outer ring looks pretty standard to me.

Pretty sure that's the setup pace made the adaptor for so you can fit a normal granny.

Edit http://www.retrobike.co.uk/forum/viewto ... p;t=199355

 

[FluffyChicken]

Re:

He wants the outer though, not the granny.