звездочка и кривошипно

1.Our main products is chainwheel&crank,we have many years experiences in manufacturing bicycle parts,and especially chainwheel&crank. 2.Our crank have two styles-The cotter crank and the cotterless crank. 1)The crank length of the cotter crank-89mm,102mm,114mm,127mm,140mm(22 bicycle),152mm(24 bicycle),165mm(26 bicycle),170mm and 175mm(28 bicycle). 2)The crank length of the cotterless crank-89mm,102mm,114mm,127mm,140mm,152mm,165mm. 3)The crank length of the children bicycle-89mm,102mm,114mm,127mm, 3.The chainwheel teeth-24T,26T,28T,32T,36T,40T,44T,46T,48T,52T,the smallest is 24T.And our chainwheel have so many styles to let you choose,if you have any other request,you can send your pictures of the products which do you want,and we also can satisfy you. 4.The triple chainring can be matched with cotter crank and cotterless crank.(152mm,170mm*48T,38T,28T.).But the plastic covered chainring only can be matched with cotterless crank. 5.The size of the double chainring is 152,165,170mm*40T,48T.and the 170mm is rare. 6.The cotter crank only can be made straight.But the cotterless crank can be made straight and bent. 7.The cotter crank has three holes 1)The B.B. Axle hole is 16 mm 2)The Pedal hole-14*1.25 mm,and the 14 mm is the diameter of the pedal hole,1.25 mm is the length between the thread.. 3)The pin hole (1)Metric:9.0 mm (2)Inch:9.5 mm 8.The cotterless crank only has two holes 1)The B.B. Axle hole 2)The pedal hole 9.Chainring cover have three styles,And we also can supply double cover chainring. 1)iron cover,and we can make it in various colour. 2)PCS cover. 3)plastic cover. 10.Finish-ED,CP,UCP. 11.Packing-one pair in a plastic bag .then 20 PRS into a carton. 12.Size-170,165*42T,34T,24T. 13.Qty- 20 PRS 14.N.W/G.W-30/31KGS 15.MEAS -52*32*23 CM