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Freewheel cogs and steps - High/Low?

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Freewheel cogs and steps - High/Low?

Old 01-23-23, 09:17 AM
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Freewheel cogs and steps - High/Low?

Happened upon this on the 'bay. Thought it was interesting - two close cogs on the low end and high end, and one in between. Enough to give mountaindave nightmares as it's not great for half-stepping, but I guess the benefit is you have nice close gearing when hammering on the flats (if anyone actually does that) or climbing? I guess I could've counted the teeth just to check but I didn't go that far in my curiousity, yet.

But I'm familiar with half-stepping, corncobs, and bailout/alpine setups, just not this configuration. Any experience would be interesting to hear!

https://www.ebay.com/itm/31430155985...mis&media=COPY

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Old 01-23-23, 11:02 AM
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Be ready for both the mountain climbs and the sprints in the same TdF stage.
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Old 01-23-23, 11:11 AM
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I should also add that the Cyclo is built differently than all other freewheels I've worked on. The pawls and their springs are carried on the outer body and the ratchet teeth are integrated into the inner body. This is the opposite of every other freewheel that I've ever serviced.
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Old 01-23-23, 11:50 AM
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i've had this Suntour freewheel hanging around for a few years. 13 16 20 30 34
i'd seriously consider using it if there's a derailleur that can make that huge jump.



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Old 01-23-23, 12:14 PM
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Not quite as extreme, but I have a nice Suntour narrow spaced 6 speed that was stock on a Trek 412 that is 14-16-19-23-27-30. Nice progressions except for that 27-30 head scratcher. Maybe I’ll try to put a 32 on it sometime.
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Old 01-23-23, 01:04 PM
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I've wondered about these freewheels myself. They look like they would work best for rolling hills. I live in the flatlands, wind is the only reason for me to swap gears. I do almost all my riding in the 55-75 inch range, so I like the middle gears to be close together so I can find the ideal cadence for the variable wind speed.
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Old 01-24-23, 01:11 PM
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Originally Posted by sd5782 View Post
Not quite as extreme, but I have a nice Suntour narrow spaced 6 speed that was stock on a Trek 412 that is 14-16-19-23-27-30. Nice progressions except for that 27-30 head scratcher. Maybe Iíll try to put a 32 on it sometime.
I once ran 16-18-21-24-26 on a short-cage SunTour Cyclone that could not handle 28T.
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Old 01-24-23, 01:12 PM
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It is hard to tell if it makes any sense or not without knowing the tooth count of the chainwheeels. It may be that the combinations allow for an evenly spaced sequence of ratios if some of the cross-chaining combinations are usable, like they might be on a bike with long chainstays.
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Old 01-24-23, 01:13 PM
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Originally Posted by hazetguy View Post
i've had this Suntour freewheel hanging around for a few years. 13 16 20 30 34
i'd seriously consider using it if there's a derailleur that can make that huge jump.



A long-cage SunTour, such as a VGT, could handle that with aplomb.
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
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Bianchi: 1982 Campione d'Italia, S/N 1.M9914
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Old 01-24-23, 02:03 PM
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Originally Posted by John E View Post
A long-cage SunTour, such as a VGT, could handle that with aplomb.
It sure could. Any suntour gt I think.
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Old 01-25-23, 05:29 AM
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Originally Posted by daka View Post
It is hard to tell if it makes any sense or not without knowing the tooth count of the chainwheeels. It may be that the combinations allow for an evenly spaced sequence of ratios if some of the cross-chaining combinations are usable, like they might be on a bike with long chainstays.
https://www.gear-calculator.com/?GR=DERS&KB=47,52&RZ=13,16,20,30,34&UF=2215&TF=90&SL=2.6&UN=MPH&DV=gearInches

Roller Coaster Gearing
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Old 01-25-23, 07:30 AM
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Yes, it sort of works with the once-common 52-47 ring combo, but I don't like the gap spanning the entire 50s to low 60s gear inch range, which I use a lot. This was also my objection with Schwinn's gappy half-step that was standard on some years of Paramounts:
52-49 / 14-16-18-23-26
This is solved easily and cleanly with a 6-speed freewheel, viz:
52-49 / 14-16-18-20-23-26
or 52-47 / 13-16-20-25-30-34 instead of the 5-speed unit shown.
This is also why I put a 13-15-17-20-23-26 ultra-6-speed freewheel on the UO-8, to go with my 45-42 ringset up front.
Side note: I really like logarithmic spacing of gear ratio displays, as provided by that calculator, because what counts is the percentage change from ratio to ratio. When I devise or test a gearset, I always rank the resulting gear-inches or equivalent and then compute the sequence of ratios from one to another, shooting for something like a 5 to 7 percent progression, except possibly at the bottom of the range, and sometimes inevitably at the top of the range (e.g., the 1.5-step gearing I use on two of my road bikes -- the others get half-step).
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Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
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Schwinn: 1988 Project KOM-10, S/N F804069
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