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Old 07-26-07, 12:39 PM   #1
bfromcolo
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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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Old 07-27-07, 12:58 PM   #2
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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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Old 07-27-07, 01:09 PM   #3
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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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Old 07-27-07, 01:12 PM   #4
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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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Old 07-27-07, 01:36 PM   #5
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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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Old 07-27-07, 07:03 PM   #6
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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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Old 07-27-07, 09:22 PM   #7
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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.
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Old 07-27-07, 09:36 PM   #8
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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.
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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Old 07-27-07, 09:53 PM   #9
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Hey Sheldon, suganoya/suntour has a link to your Glossary!
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