Home > categories > Minerals & Metallurgy > Aluminum Foils > why does my bmx bike chain tighten and loosen as the crank spins?
Question:

why does my bmx bike chain tighten and loosen as the crank spins?

i just bought a new shadow conspiracy sprocket, shadow half-link chain, and a sun ringle estate wheel complete, so im sure i dont have a bent sprocket, messed up chain ( completely lubed and everything) or a messed up hubIs there any other reason this could be happening? im trying to fix it so my bike rides cleaner and the parts dont get messed up faster than they should.Thanks,-Josh

Answer:

lol, this question is a real slap in the face to chemistryIt looks like it had an affair with math First we work out the price of one sheetWhich is 7.78/500 $0.01556 per sheet So next how many Square inch's are in a 12 x 10.75 sheetWell from the dimensions we can work out the area of the sheetsWhich are all the numbers times by each otherthis equates to 129 inch's^2 So now we divide our previous number(0.01556) by 129 This gives 1.21x10^-4 dollar/inch's^2 (3 sig figs) Hope I helped!
1 box $7.78 1 box 500 sheets 1 sheet 12 x 10.75 129 in^2 To find the cost in $/in^2: 500 sheet x (129 in^2 / 1 sheet) 64,500 in^2 $7.78 / 64,500 in^2 0.00012 $/in^2
First determine area per sheet Area 12 x 10.75 129 sqin/sheet for 500 sheets 129 x 500 64,500 sqin $/sqin $7.78/64500 sqin $0.0001206/in^2
It happens on nearly every singlespeed bike, so it's nothing to worry aboutBasically, it's because either the sprocket or the driver is slightly out of roundEven with modern technology, it's nearly impossible to make a 100% round circle from cast steel or aluminum, so the tight spots occur as a result of the chainlength just barely changing.

Share to: