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Thread: Derailler specs

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    Senior Member bfromcolo's Avatar
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    Derailler specs

    How would I determine the max rear cog and range of an old Suntour Edge 4050 rear derailler, is there somewhere I can look this up? Currently its on a bike running a 52/42 and 13/26 combo, and I am wondering if this derailler could handle a 53/38 and 13/28. So does it support a 28t max rear cog and a total difference of 30?
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    Elitist Troglodyte DMF's Avatar
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    There's precious little Suntour info online. The RD-4500 is a low-end unit from the early to mid 80's. Also called ARX-GT, I think, the -GT indicating a long cage. (Can you confirm? What's the distance between the jockey wheels?) Neither of the "catalog" images I have (80, 82) list it. Nor does the 1987 dealer catalog, but the apparent replacement RD-SN00-GT lists capacity as 34T and the largest rear sprocket as 28T or 30T (depending on drop dimension).
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    cycles per second Gonzo Bob's Avatar
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    The Edge supports a 28T large cog. I've run Edge and GPX rear derailers on a 13-28 FW. It should also support a 30 total difference. I've run my GPX (which replaced my Edge when I bunged it up) on a total difference of 32 (44x29 with 11-28).

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    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by bfromcolo View Post
    How would I determine the max rear cog and range of an old Suntour Edge 4050 rear derailler, is there somewhere I can look this up? Currently its on a bike running a 52/42 and 13/26 combo, and I am wondering if this derailler could handle a 53/38 and 13/28. So does it support a 28t max rear cog and a total difference of 30?
    That will certainly work.

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    Senior Member bfromcolo's Avatar
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    Thanks for the responses. I found one Japanese site that listed 28/28 as the specs for this, I figured it would probably work.

    http://translate.google.com/translate?hl=en&sl=ja&u=http://www.suganoya.net/suntour.htm&sa=X&oi=translate&resnum=10&ct=result&prev=/search%3Fq%3Dsuntour%2B4050%2Bedge%26hl%3Den%26client%3Dfirefox-a%26channel%3Ds%26rls%3Dorg.mozilla:en-USfficial%26sa%3DG

    DMF this was the orig derailer from an 89 Trek 400. It is not a long cage.
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    I had a Sun Tour ARX-GT rd that came stock on an '85 Bridgestone 400 that also came with a 14x32 6-speed freewheel so the ARX would clear a 32T cog. Don't know about the Edge.

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    Elitist Troglodyte DMF's Avatar
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    Cheez! I read that as 4500, not 4050. Different animal. Never mind.

    1989 catalog illustration shows RD-XE45 as a long cage. Does yours say XCE on it?

    Following the Suntour link, there is an EDGE 4050 road version RD-ED45-SSB with a short cage. Capacity is 28 and you want to feed it 30? Be careful.
    Last edited by DMF; 07-27-07 at 10:53 PM.
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    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by HillRider View Post
    I had a Sun Tour ARX-GT rd that came stock on an '85 Bridgestone 400 that also came with a 14x32 6-speed freewheel so the ARX would clear a 32T cog. Don't know about the Edge.
    SunTour "GT" derailers will generally handle a 34 tooth rear sprocket.

    There were very few rear derailers ever made that wouldn't work with a 28.

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    Elitist Troglodyte DMF's Avatar
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    Hey Sheldon, suganoya/suntour has a link to your Glossary!
    Stupidity got us into this mess - why can't it get us out?

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