The Wheel and cycling trade review . uarrel, with aconsequent noise and a waste of power. There-fore, as already emphasized, it pays to lookafter chain and sprockets. On the inch pitch each tooth represents ap-proximately 5-16 of an inch in sprocket diam-eter; expressed decimally, the sprocket runsvery nearly of an inch diameter pertooth. So we may construct a table thus: No. Teeth Diameter|No. Teeth Diameter of Sprocket. 4 5 Sprocket. Sprocket. 20 21. 22 23 Sprocket. ..WW 32 The following diagram, drawn
The Wheel and cycling trade review . uarrel, with aconsequent noise and a waste of power. There-fore, as already emphasized, it pays to lookafter chain and sprockets. On the inch pitch each tooth represents ap-proximately 5-16 of an inch in sprocket diam-eter; expressed decimally, the sprocket runsvery nearly of an inch diameter pertooth. So we may construct a table thus: No. Teeth Diameter|No. Teeth Diameter of Sprocket. 4 5 Sprocket. Sprocket. 20 21. 22 23 Sprocket. ..WW 32 The following diagram, drawn to scale, willshow to the eye the actual twenty-eight-inchwheel and some sizes to which it is or may bespeeded, as already explained; this equivalentsize (or ratio of forward movement to the rateof pedalling) is as if the rider actually be-strode a wheel of the equivalent size andpushed it around directly with his feet, thelength of crank throw and of the circle tra-versed by the foot having nothing to do withthis particular As stated in our last article, the questionof larger sprockets divides into two—the ef-fect upon the construction itself and the effectupon ease and comfort of the rider. In a meas-ure, these two are distinct questions, and yet they run much together. High gear and gear-ing by large sprockets are also matters whichare not just the same, and yet these, too, gettogether. While we feel entirely sure of theadvantage of larger sprockets, we frankly ad-mit that we find some difficulty in satisfac-torily giving the reasons. Yet facts are al-ways or more—or of more immediate—conse-quence than the reasons for them; for ex-ample, electricity is cheerfully put to servicewithout waiting for insight enough to explainits nature or even one of its phenomena. The seven-tooth sprocket has had large use,because a high-speed ratio (see table) can beobtained by it with front sprockets of verymoderate size; it is commonly put on racingwheels, is considerably used
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcyclist, bookyear1888
