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Suntour GS dropouts

Old 01-29-17, 12:11 PM
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Suntour GS dropouts

I'm curious what the differences are between the Suntour GS, GS II and GS III dropouts on 70/80s bikes. The GS and GS III look the same and are broader at the eyelet than the GS II, not sure why that is ?
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Old 01-29-17, 02:17 PM
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Thread moved from C&V Appraisals to C&V forum.
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Old 01-30-17, 09:50 AM
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Originally Posted by Torm View Post
I'm curious what the differences are between the Suntour GS, GS II and GS III dropouts on 70/80s bikes. The GS and GS III look the same and are broader at the eyelet than the GS II, not sure why that is ?
Do you have some pictures? I wasn't aware there were different variants of the GS dropout. My only experience with them is on a Schwinn Super Sport frame which is hanging in my basement. The GS certainly has more drop than a typical Campy 1010/[AB] dropout, about 4mm more as I recall. Do the SunTour GS variants differ in that regard, perhaps?
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Old 01-30-17, 09:53 AM
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If you have what I think you do, the offset to the seat stay end was for chain clearance.
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Old 01-30-17, 10:00 AM
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The main differences I can tell are in the positioning and style of logo the early ones had a split TT logo on the top side while the later ones had the wrap around second type logo and appear to have slightly more refined finish.

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Old 02-06-17, 04:13 AM
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Here are scans from the original catalogues which indicate that they have the same drop and show the difference visually but with no explanation.

I guess the chain clearance is a good explanation, or was it possibly creating a greater OLD so was one designed for 5 speed and one for 6/7 speed (120mm vs 126mmOLD ?) do you think, although the first scan is from 1977 when it was mainly 5 speed
Attached Images
File Type: jpg
Suntour MY 1978 28-filtered.jpg (94.5 KB, 202 views)
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Old 02-06-17, 08:13 AM
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Thanks for the scans
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Old 02-06-17, 10:20 AM
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@Torm Thanks for the scans. Do they appear at full scale? For example, the last page of images (p 28) appears to be 468 x 633. Is that what you uploaded? I've complained to the powers-that-be that large images seem to be turning up as too-big-for-thumbnails but not-full-size either. I've been told, "no, they are full size." Please let me know. I will take up the cause once again if your originals are higher resolution than that.
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Old 02-06-17, 03:11 PM
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I got them from this excellent website....plenty of high quality scans of original Suntour catalogues, take a look on there to see the versions.

I'm guess I'm less interested in aesthetic difference like logos, what I'm interested in is why only one set of rear dropouts with eyelets in the range has 2 planes whilst the others are in 1 plane.

.disraeligears.co.uk/Site/Scanned_material_-_SunTour.html
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Old 02-07-17, 06:37 AM
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Thanks. You just downloaded them and uploaded them, right? No scaling?

For future reference, when a resource like this is already on the net, I think it's better to just reference it directly. No sense having two versions, and the reference reduces any chance of copyright issues down the road.
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Old 02-07-17, 04:07 PM
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He uploaded smaller resized images, the original scans on the site are larger. I agree that simple direct links to the originals are preferred: Scanned material - SunTour


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Old 02-07-17, 04:31 PM
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Pretty sure the "two plane" DO was to allow for the extra cog when the industry began shifting from 5 to 6 speed rear ends.

I had those very DOs on my 1980 Raleigh Super Course 12.

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Old 02-12-17, 11:21 AM
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[QUOTE=Metacortex;19363608]He uploaded smaller resized images, the original scans on the site are larger. I agree that simple direct links to the originals are preferred

Agreed, I would have referenced the websites however as I am a newbie I wasn't allowed to use web addresses until I have done 10 posts, infact I can't even reply to a comment with urls in! Does that explain why I had to use the scans?

I'm not convinced about the 5/6 spacing explanation, can someone explain it to me in more detail.

I have these DO on my 85 Holdsworth.
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Old 02-23-17, 08:33 AM
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[QUOTE=Torm;19373532]
Originally Posted by Metacortex View Post
He uploaded smaller resized images, the original scans on the site are larger. I agree that simple direct links to the originals are preferred

Agreed, I would have referenced the websites however as I am a newbie I wasn't allowed to use web addresses until I have done 10 posts, infact I can't even reply to a comment with urls in! Does that explain why I had to use the scans?

I'm not convinced about the 5/6 spacing explanation, can someone explain it to me in more detail.

I have these DO on my 85 Holdsworth.
Just spoke to a frame builder and they have suggested that it is for chain clearance, rather than sculpturing the chain stay which some builders do.

He also mentioned that it was quite unusual to have Suntour drop outs on a Holdsworth as they were the UK distributors of Campag so it was probably a customer request.
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