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 Post subject: Re: STX and STX RC
PostPosted: Sun Sep 01, 2013 5:22 pm 
National & North West AEC
National & North West AEC
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Joined: Mon Nov 03, 2008 12:43 am
Posts: 8146
Location: Macclesfield Forest
Your LBS is being overly cautious. They are standard 104 BCD chainrings so pretty much any standard 4 arm chainring will fit them.


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 Post subject: Re: STX and STX RC
PostPosted: Sun Sep 01, 2013 6:07 pm 
retrobike rider
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Joined: Fri Aug 08, 2008 2:36 pm
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Location: Yorkshire, England
It is the first of the now standard 104 4arm bcd , so yes go fit some new ones.


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 Post subject: Re: STX and STX RC
PostPosted: Sun Sep 01, 2013 8:36 pm 
Dirt Disciple

Joined: Sun Dec 21, 2008 1:26 pm
Posts: 20
Cheers, you've no idea how confused I've got about this. My LBS generally are absolutely excellent, but when I took my old P7 in there (99 model) for a service - they advised I needed a new chainset, as STX-RC was not compatible, something about the inner ring. I must admit, I didn't understand at the time, the point of changable rings, when they only fitted one crank, why my rings wouldn't be compatible. I don't think they were trying to "oversell" to me, genuinely, they've done quick jobs for free even when I was happy to charge (taking a spider of a bmx chainring).

The crank arms themselves are in good nick, and so is the sq taper BB, so it seemed a waste of metal to junk the whole lot.


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 Post subject: Re: STX and STX RC
PostPosted: Mon Sep 02, 2013 1:37 am 
Old School Grand Master

Joined: Sun Oct 21, 2007 2:33 am
Posts: 5487
Location: WI, USA
94-6 most OEM manufacturers "broke group" when specing and went with nicer pieces from STX SE and STX RC because there was substantial weight savings in items like the crankset which had a light arm, alloy out ring and and rings were bolted not riveted like the standard STX which was basically a rebadged Alivio crank, Many companies mixed STX-RC in with LX and XT spec'd bikes because the weights were similar on items like hubs and brakes and the price was considerably lower.


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 Post subject: Re: STX and STX RC
PostPosted: Mon Sep 02, 2013 11:34 am 
National & North West AEC
National & North West AEC
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Joined: Mon Nov 03, 2008 12:43 am
Posts: 8146
Location: Macclesfield Forest
Juju wrote:
Cheers, you've no idea how confused I've got about this. My LBS generally are absolutely excellent, but when I took my old P7 in there (99 model) for a service - they advised I needed a new chainset, as STX-RC was not compatible, something about the inner ring. I must admit, I didn't understand at the time, the point of changable rings, when they only fitted one crank, why my rings wouldn't be compatible. I don't think they were trying to "oversell" to me, genuinely, they've done quick jobs for free even when I was happy to charge (taking a spider of a bmx chainring).

The crank arms themselves are in good nick, and so is the sq taper BB, so it seemed a waste of metal to junk the whole lot.


All depends which version of STX-RC you have on your bike. You've mentioned that it the MC-40 version which was one of the first Shimano 4 arm chainsets with all three rings replaceable with the now common 104/64 BCD chainrings.

Some of the five arm versions did have an odd arrangement were the inner chainring was bolted to a special middle ring and not to the crank spider.

Your LBS is right to be a cautious, and it shows that they know about the peculiarities of STX and STX-RC.

I'll check on my MC-40 crankset later today but I'm pretty sure that they do have 104 BCD chainrings for the middle and outer and 64BCD for the inner.
Shimano did play around with BCD with some other cranksets, especially with XTR. They have used 102, 112 and 146mm for the outers and 68mm for the inners.


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