Shimano STX Chainring Compatibility

Gadro · Feb 1, 2009

Hi guys currently doing a refurb but need to source some new chainrings for my Shimano STX Cranks. The old ones are totally shot, teeth missing, etc.

I've had a look on eBay but am baffled by the sizing.

The current knackered chainrings are K series K-42, K-32, K-22. Can't find matching spec even on Google

The cranks are 5 arm, 5 bolt, pic below

Will be looking to get 9 speed compatibility out of the cranks.

Really would like to keep this crank arms as they are nice and shiny

FluffyChicken · Feb 1, 2009

If Shimano use the standards 'Compat 5-arm' for these, then it should be easy.
Is the 'M' code on the cranks at all, like MC-42 or something.

e.g.

http://www.chainreactioncycles.com/Kits ... delID=3367
or
http://www.chainreactioncycles.com/Mode ... delID=4324
or
http://www.chainreactioncycles.com/Kits ... delID=3365
...

depends how much you are looking to spend.

one-eyed_jim · Feb 1, 2009

On some models of STX cranks, the middle ring was used to carry the granny. If you have one of those and want to use your cranks as a triple, you'll need to source one of those rare STX or STX-RC middle rings.

http://bernd.sluka.de/Fahrrad/Shimano/T ... 4_1996.gif

There was more than one version though. See my posts to the thread here for more information:

http://forum.ctc.org.uk/viewtopic.php?t=20168

If you don't need a granny chainring, standard 94mm bcd rings (say 30t and 42t) will give you a nice double, or you can run a single chainring, of course.

If your crank has granny ring mounts, they're standard 58mm bcd.

hamster · Feb 2, 2009

Very briefly (I think for one year) they actually ran a different PCD on STX - it was only by a couple of mm. If you are unfortunately to have one of these, then you will be stuck.

one-eyed_jim · Feb 2, 2009

hamster":6ukdohqz said:
Very briefly (I think for one year) they actually ran a different PCD on STX - it was only by a couple of mm.
If you are unfortunately to have one of these, then you will be stuck.

I'd missed that.

Here you go - 1994:

http://bernd.sluka.de/Fahrrad/Shimano/T ... 0_1994.gif

http://bernd.sluka.de/Fahrrad/Shimano/T ... H_1994.gif

http://bernd.sluka.de/Fahrrad/Shimano/T ... 1_1994.gif

STX and Alivio use a 95mm bcd for the outer ring!

:shock:

Luckily that's not what Gadro's got.

2alexcoo · Feb 2, 2009

I have the original type - they look normal, until you take them apart!

58mm BCD middle ring, 95mm outer ring that bolts directly to the middle ring... wrong on so many levels.

I'm hoping they become collectible one day

legrandefromage · Feb 2, 2009

I have some spare rings for these - 'missing' teeth are actually there too aid shifting.

Gadro · Feb 2, 2009

Have you got the outer 42T ring? If so could you post or Pm me a pic

Gadro · Feb 2, 2009

Here's a pic of before and after I gave them a good cleam. Outer Ring although nice and shiny is slightly pitted. Want to keep the original look not too fussed on flashy anodised outer rings.

Want to keep it nice and simple and original.

SeeingisBelievingGTMuseum · Feb 3, 2009

hamster":sg7clcvv said:
Very briefly (I think for one year) they actually ran a different PCD on STX - it was only by a couple of mm. If you are unfortunately to have one of these, then you will be stuck.

+1 this is exactly what I was going to say. Have a feeling that may have been the steel chainringed STX cranks though not the STX RC. The first year of STX only the RC stuff had changeable rings.

Shimano STX Chainring Compatibility

Gadro

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