Кривошипно велосипедов

chainwheel CST-LRQB-20 1.175.170.165.152*48T.44T.40T.36T.32T 2.Finish ED&CP 3.MEAS 46*28*21CM 4.Q'TY30 PRS 5.N.W/G.W 30/31 KGS 6.Our crank have two styles: The round cottercrank and thecotterless crank. 7.the length of thecotter crank is 89 mm, 102 mm, 114 mm, 127mm (children bicycle),140mm(22#bicycle),152mm(24#bicycle),165mm(26#bicycle),170mm,175mm(28#bicycle). cotterless crank without 170mm, 175mm. 8.B.B.AXLE hole is 16mm. 16mm 9.pin-hole is 0.95cm 10.petal spindleis 14*1.25mm 11.Crankset ofcotter crank has 24T, 26T, 28T, 32T, 36T, 40T, 44T, 46T, 48T, 52T. 12.shape of crank:winding 12.high quatily,competitive price Cycling exercise - lots of other good bikes in China is a very common and is very convenient means of transport to work and visiting people when they frequently use it. According to recent findings of the study showed that cycling and jogging, swimming, as one of the most able to improve their cardiorespiratory function in endurance exercise. In other countries, riding a bike fitness can be said that the ascendant. In the United States, according to "U.S. News And World Report," revealed the United States there are 20 million people ride bicycles Lut fitness, and the number of participants, more and more in 1987 than in 1986, an increase of 30% in 1988 off than in 1987 an increase of 36%. France, Germany, Belgium, Sweden and other countries, but also to ride a bike, "day trip" fashionable sports tourism recreational activities, attracting thousands of people to take part.