Bicycle Gear Calculator...stumped!
06-11-22, 09:37 AM
#1
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Bicycle Gear Calculator...stumped!
I'd like to see those young urban guys try this single-speed beast!
Interestingly, when I open up their website (sillycycle.com), pics of frame and tubing tools cropped up.
Interestingly, when I open up their website (sillycycle.com), pics of frame and tubing tools cropped up.
Last edited by 67tony; 06-11-22 at 10:24 AM.
06-11-22, 10:21 AM
#2
feros ferio
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Wow! Trying for the world land speed record? 
How many teeth front and rear? Here I thought the 58T chainring that came with my first Sieger was big ... .
Almost all-orig. 1960 Capo Sieger
How many teeth front and rear? Here I thought the 58T chainring that came with my first Sieger was big ... .Almost all-orig. 1960 Capo Sieger
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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
06-11-22, 10:31 AM
#3
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06-11-22, 11:13 AM
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And it's a mid-70s Schwinn Varsity!
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06-11-22, 12:34 PM
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It looks like someone might have made a new drive-side chainstay, in order to clear that giant chainring! That's a lot of dedication & effort for a Varsity!
It certainly reminds me of an earlier Schwinn that hit 108.92 mph....
Steve in Peoria
It certainly reminds me of an earlier Schwinn that hit 108.92 mph....
Steve in Peoria
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06-12-22, 11:53 AM
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^^^^^^ Fork's bent.
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06-12-22, 12:08 PM
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the classic jokes just never get old. 
but seriously... it took this long for me to notice that Alfred's bike looks pretty much like a standard "stayer" bike used in motorpaced track races. Even the helmet is from that activity.
For those not familiar with this rather unique activity, Cycling Weekly has a nice article on it:
https://www.cyclingweekly.com/news/l...r-bikes-316992
The change from motorpacing behind a motorcycle to a sprint(?) car isn't too huge, aside from that chainring and the magnitude of the potential injuries.
Steve in Peoria
but seriously... it took this long for me to notice that Alfred's bike looks pretty much like a standard "stayer" bike used in motorpaced track races. Even the helmet is from that activity.
For those not familiar with this rather unique activity, Cycling Weekly has a nice article on it:
https://www.cyclingweekly.com/news/l...r-bikes-316992
The change from motorpacing behind a motorcycle to a sprint(?) car isn't too huge, aside from that chainring and the magnitude of the potential injuries.
Steve in Peoria
Last edited by steelbikeguy; 06-12-22 at 07:18 PM. Reason: I can't type... or spell.
06-12-22, 07:07 PM
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Notice how the chainrings are nearly the same design. Whoever modified the Varsity certainly was paying tribute to the 1941 Paramount.
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06-12-22, 07:22 PM
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There are distinct differences in the chainrings.. maybe the most important is that it is for a 1/2" pitch chain, while the original is using 1" pitch block chain (I'm fairly sure). There are some minor differences in hole patterns too, so it's not like someone just showed a machinist a photo of the original and said "make me a copy".
It still seems like a lot of work for a bike that almost certainly can't be ridden, IMHO, etc.
Steve in Peoria
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06-12-22, 07:26 PM
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I really like the adjustable bar stems on the Capo and the Paramount.
Checking on the'Bay doesn't show any.
Does anyone know the model(s)?
Edit: Yowzers! I checked "adjustable racing stem" and they're not cheap 😮.
Checking on the'Bay doesn't show any.
Does anyone know the model(s)?
Edit: Yowzers! I checked "adjustable racing stem" and they're not cheap 😮.
Last edited by WGB; 06-12-22 at 07:29 PM.
06-12-22, 08:11 PM
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I always thought they were pretty interesting, and possibly useful when setting up a bike. Never bothered to actually buy one, though.
Steve in Peoria
06-13-22, 12:01 PM
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feros ferio
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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
06-13-22, 07:13 PM
#14
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That chainring appears to me to have considerably more than 57 teeth.
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06-13-22, 08:20 PM
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honestly, I can't count them, but since it is an inch pitch chain, the 57 teeth means a circumference of 57 inches.
The diameter would be 57/3.14, or 18 inches, or a radius of 9 inches. Assuming a crank length of 6.5 inches, the chainring looks like it could easily have a radius of 9 inches.
For those who aren't familiar with 1 inch pitch chains and chainrings, my old Cyclo-Pedia catalog shows some inch pitch track chainrings on the right side of this page....
I don't think I have a picture of a block chain that goes with these inch pitch rings, unfortunately.
edit: I do have this shot of a chain that isn't block chain, but is a roller chain with spacing that appears to replace block chain...
Steve in hot Peoria (and getting hotter)
The diameter would be 57/3.14, or 18 inches, or a radius of 9 inches. Assuming a crank length of 6.5 inches, the chainring looks like it could easily have a radius of 9 inches.
For those who aren't familiar with 1 inch pitch chains and chainrings, my old Cyclo-Pedia catalog shows some inch pitch track chainrings on the right side of this page....
I don't think I have a picture of a block chain that goes with these inch pitch rings, unfortunately.
edit: I do have this shot of a chain that isn't block chain, but is a roller chain with spacing that appears to replace block chain...
Steve in hot Peoria (and getting hotter)
Last edited by steelbikeguy; 06-13-22 at 08:23 PM.
06-13-22, 08:24 PM
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159 feet per second is equal to 108.4 mph!
06-14-22, 01:14 PM
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honestly, I can't count them, but since it is an inch pitch chain, the 57 teeth means a circumference of 57 inches.
The diameter would be 57/3.14, or 18 inches, or a radius of 9 inches. Assuming a crank length of 6.5 inches, the chainring looks like it could easily have a radius of 9 inches.
Steve in hot Peoria (and getting hotter)
The diameter would be 57/3.14, or 18 inches, or a radius of 9 inches. Assuming a crank length of 6.5 inches, the chainring looks like it could easily have a radius of 9 inches.
Steve in hot Peoria (and getting hotter)
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06-14-22, 02:00 PM
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Here's a link to the full resolution image: https://live.staticflickr.com/4545/3...18b54_4k_d.jpg
It's interesting to see what they had to do to the chainstay to provide clearance for that giant chainring.
Steve in Peoria
oh... I should mention that I've seen this bike in person, while on RAGBRAI. Pretty impressive.
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06-14-22, 08:09 PM
#19
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Ahhh- good catch- it's 57 metric teeth.
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Commence to jigglin’ huh?!?!
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Commence to jigglin’ huh?!?!
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06-14-22, 08:53 PM
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Double it and add 30.....
Actually, to simplify on Steve's math, it's basically a skip-tooth chainring, so 57 teeth spaced at 1 inch would, in our 1/2-inch-chain world, equate to 114 teeth.
(I'm guessing the RAGBRAI photo was taken when the now-C&V van was "modern"?)
Actually, to simplify on Steve's math, it's basically a skip-tooth chainring, so 57 teeth spaced at 1 inch would, in our 1/2-inch-chain world, equate to 114 teeth.
(I'm guessing the RAGBRAI photo was taken when the now-C&V van was "modern"?)
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06-14-22, 09:04 PM
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In fact, it was so vintage that Schwinn was still in business! Good heavens.
Steve in Peoria
06-14-22, 09:12 PM
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Cool, and about what I expected time-wise. That lettering/branding of the word SCHWINN depicted on the van matches my stable of '89-'92s (eek, better not reveal how many....).
06-15-22, 01:26 PM
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Also, I hadn't realized the people were counting the teeth in base ten.
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