They have teeth spaced to engage every link of the chain as it passes over.
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The designers are still cutting weight everywhere they can, reinforcing critical junctions like the bottom bracket.
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Carpenter-Phinney then "threw" her bike forward and won the gold medal by less than than half a wheel, becoming the first female Olympic cycling champion.
What kind of bikes do you ride in track cycling? Our full range of Track Cycling Sprockets can be found.