bike

sprocket

Jovan Stosic December 30, 2018

■ noun
each of several projections on the rim of a wheel that engage with the links of a chain or with holes in film, tape, or paper.
(also sprocket wheel) a wheel with projections of this kind.

C16 (denoting a triangular piece of timber used in a roof): of unknown origin.
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EngMac
sprocket
n. 1. (исто и sprocket-wheel) запченик.; 2. забец (на запченик)
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Merriam-Webster Collegiate® Dictionary
sprock·et
Pronunciation: ‘sprä-kət
Function: noun
Etymology: origin unknown
Date: 1886

1 : a toothed wheel whose teeth engage the links of a chain
2 : a cylinder with teeth around the circumference at either end that project through perforations in something (as motion-picture film) to move it through a mechanism (as a projector)

sprocket was last modified: December 30th, 2018 by Jovan Stosic

rivet

Jovan Stosic December 30, 2018

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Concise Oxford English Dictionary
rivet
‘rɪvɪt
■  noun a short metal pin or bolt for holding together two metal plates, its headless end being beaten out or pressed down when in place.
■  verb (rivets, riveting, riveted)
    join or fasten with a rivet or rivets.
    completely engross. ▶direct (one’s eyes or attention) intently.
 

riveter noun
riveting adjective
rivetingly adverb
 

ME: from OFr., from river ‘fix, clinch’.
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EngMac
rivet
(fig)задржува поглед (на), заковува; (v)зацврстува, кове, приковува; навртка, железна чивија; навртка, железна чивија, заковка
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English-Serbian dictionary
Rivet
Zakovica-Pricvrstiti-Prikovati-Zakivak
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Merriam-Webster Collegiate® Dictionary
1riv·et
Pronunciation:     ‘ri-vət
Function:           noun
Etymology:          Middle English, clinch on a nail, rivet, from Old French, from river to attach, rivet, probably from rive border, edge, bank, from Latin ripa
Date:               15th century

: a headed pin or bolt of metal used for uniting two or more pieces by passing the shank through a hole in each piece and then beating or pressing down the plain end so as to make a second head
2rivet
Function:           transitive verb
Date:               15th century

1 : to fasten with or as if with rivets
2 : to upset the end or point of (as a metallic pin, rod, or bolt) by beating or pressing so as to form a head
3 : to fasten or fix firmly
4 : to attract and hold (as the attention) completely
 –riv·et·er noun

rivet was last modified: December 30th, 2018 by Jovan Stosic

Cadence (cycling)

Jovan Stosic March 2, 2017

In cycling, cadence (or pedalling rate) is the number of revolutions of the crank per minute; this is the rate at which a cyclist is pedalling/turning the pedals. Cadence is directly proportional to wheel speed, but is a distinct measurement and changes with gearing—which determines the ratio of crank rpm to wheel rpm.

Cyclists typically have a cadence at which they feel most comfortable, and on bicycles with many gears it is possible to maintain a preferred cadence at a wide range of speeds. Recreational and utility cyclists typically cycle around 60–80 rpm. According to cadence measurement of 7 professional cyclists during 3 week races they cycle about 90 rpm during flat and long (~190 km) group stages and individual time trials of ∼50 km. During ∼15 km uphill cycling on high mountain passes they cycle about 70 rpm.[1] Cyclists choose cadence to minimise muscular fatigue, and not metabolic demand, since oxygen consumption is lower at cadences 60-70 rpm.[2] When cycling at 260 W, a pedal force was the lowest at 90 rpm, lower than at 60, 75, 105 or 120 rpm. It is primarily due to increase of inertia of the crank with increasing cadence.[2]

Any particular cyclist has only a narrow range of preferred cadences, often smaller than the general ranges listed above. This in turn influences the number and range of gears which are appropriate for any particular cycling conditions.[3]

Certain cyclocomputers are able to measure cadence, and relay the reading to the cyclist via a display, typically mounted on the bicycle’s

Source: Cadence (cycling) – Wikipedia

Cadence (cycling) was last modified: September 25th, 2017 by Jovan Stosic