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3-speed gear inches?

Old 11-23-04, 12:48 PM
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CdCf
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3-speed gear inches?

3-speed bikes are very common where I live.
Does anyone know what gear inches they typically have?
My guess would be something like 30, 60 and 90, but I really have no idea.
Anyone?
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Old 11-23-04, 01:11 PM
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On the Sturmey Archer 3 speed the ratio was 33%, which would give something like 45, 60, 80. The middle gear was a direct drive, so you could calculate the gear inches from the chainwheel and sprocket teeth count and the rear wheel diameter.
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Old 11-23-04, 01:16 PM
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Yes, the ratios are 0.75, 1.0, and 1.33 on a standard "wide-range" Sturmey hub. Typical sprocket selections yielded about 50, 66, and 88 gear inches. This is a pretty useful range of gears, but the jumps between ratios are a bit severe. I always liked my hybrid 12-speed, with a 40-tooth chainring and 14-16-18-20 cluster on a Sturmey 3-speed hub, yielding 39 to 99 gear inches with much more manageable progression steps.
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Old 11-23-04, 01:57 PM
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Thanks!

That's a pretty high lowest gear, after all, at 45-50.
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Old 11-23-04, 03:23 PM
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I had a cheap folder with 20" wheels, and the gears were about 36, 48, 64. I used it for winter riding and it was great spinning practice.
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Old 11-23-04, 03:45 PM
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Spinning on ice?

Seriously though, my MTB's lowest gear is 19", and that's my normal gear for any serious climbing. And half the time, I wish I could have a lower gear still.
So a low of 40 is high in my opinion. Up moderate slopes ("sloping" flat roads), I normally ride in a 32" gear.
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Old 11-23-04, 08:21 PM
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I could have used a lower gear for the small hills I had to take because the bike weighed about 50 lbs. On the flat with a top gear of 64 my feet were going at about 120 rpm.
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