29-tooth Suntour Perfect cog?
11-12-15, 08:23 AM
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29-tooth Suntour Perfect cog?
I know Suntour made 27-tooth cogs for Perfect freewheels, because I have a couple of them. But did they ever make a 29? I've never seen one, but would love to get my hands on one if they exist.
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11-12-15, 10:22 AM
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According to my Sutherland's (4th Edition), no. The inner position cogs were made in single-tooth increments from 16T-28T, but above that went to two-tooth increments.
11-12-15, 12:20 PM
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Thanks, John. So that would imply that while there's no 29, there must be some 25s out there somewhere. As a gearing obsessive, I'm glad to know that.
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11-12-15, 12:23 PM
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even numbers only .. but have a company with a laser cutter .. the cogs are flat steel and so can be custom made.
11-12-15, 12:49 PM
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I swear that at one time in the past I built up a Suntour Perfect with a 29T large sprocket. It should be on the Perfect in these pictures. Unfortunately it would be nearly impossible to count the teeth.
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11-12-15, 05:26 PM
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I'll bet that's it, Bob. Judging from how each cog's peaks fit the next cog's valleys, I would call that a 14-17-20-25-29.
SunTour dropped the larger odd sizes in the early 1970s. I have a 25, and I had a 27 on my 1971 Nishiki, but I have never personally had a 29 or a 31.
SunTour dropped the larger odd sizes in the early 1970s. I have a 25, and I had a 27 on my 1971 Nishiki, but I have never personally had a 29 or a 31.
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
11-12-15, 11:51 PM
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It takes a gear-head, er, sprocket head(?) to see what you clearly saw.
I'm somewhat in the habit of using the quick-look method to make a call on a stack of cogs, comes in handy when at a swap meet or when digging through boxes while putting togther another build. Any pair of cogs can easily bee seen as being both odd or both even, but not quite as easy to say which.
Wheels and their spoke count are much the same.
Oh, and I can't recall ever seeing a Suntour 29t or 31t, but 27's are not rare. As for Shimano, I don't think they ever made a 27t freewheel cog.
11-13-15, 10:56 AM
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Spent some time this morning searching through my spare Perfect/ProCompe sprockets and did not come up with a 29T. Might still be on a freewheel. I'll check those next.
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11-13-15, 08:54 PM
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The thought did cross my mine, but compare the height difference between the teeth on the 14 and the 20 against the one between the 20 and the 25/26. The latter looks like a smaller difference to me, which would support my 20-25 assertion. The last jump is clearly 4 teeth, and the first two are clearly 3 teeth each.
We should retitle this thread "In search of the lost cog," or "In search of the Perfect cog."
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"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069
11-14-15, 07:04 AM
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"Leave no sprocket unturned!" 
@jonwvara in my search for the mythical 29T I do believe I came across a few 25T (although the 25T pares well with the 16-20-25-30-34-38, a Perfect "monster," so-to-speak).
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11-14-15, 06:21 PM
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The thought did cross my mine, but compare the height difference between the teeth on the 14 and the 20 against the one between the 20 and the 25/26. The latter looks like a smaller difference to me, which would support my 20-25 assertion. The last jump is clearly 4 teeth, and the first two are clearly 3 teeth each.
