This is for a 2 piece crank but the same concept applies to most other types.

Step 1: Get an allen wrench (or in my case a 9/16 socket) and take out the bolt in the opposite side the crank is on.

Step 2: Pull off the crank

Step 3: Get a big wrench or large vise-grips and take off the nut, it will have a cicular one that just slides off behind it as well.

Step 4: Use a flat-head screw-driver and a hammer while looking down the bike while it is on the seat and bars (AKA, upside down) and put the tip of the driver in the slit on the right side of the circular nut and hold the other crank in between your legs and hammer down and un-screw that bolt.

Step 5: You now have you bearing seal in one hand and the bearings probably in the frame, take them out and pull the other side of the crank out and take the bearings out of that side too so they don't get dirt in em and put em aside.(note the large amounts of grease, if you can clean off all parts the bearings touch including the bearings themselves and apply fresh grease when you reasselmble)

Step 6: Unbolt the nuts and bearing seal and slide off the sprocket.

Step 7: Take the new sprocket and slide it on, making sure that when you tighten the nuts back on that the little knob that sticks out on the crank goes in the little whole on the sprcoket.(make sure that you put nuts and seal back on in the same exact order as when they came off. I usually lay them out in order af assembly on a table to help)

Step 8: Bolt back on the nuts in order on the crankless side and slide on the crank bolting that back on as well making sure that the crank es parallel to the other side.

Step 9( if needed): Most of the time when you change your sprocket size you'll need to shorten/lengthen your chain. To do so get a chain breaker(and a masterlink if one isn't already on) and some spare chain. Put the chain that is already on the bike on like your getting ready to put it back together. If you can't get it back on thatn you need to lengthen the chain, if its too loose than you need to shorten it.

Lengthening: Put the chain-breaker on a link wher the small cylinder is and keep tightenig untill it pops out. Measure the length you need and take the spare chain and put it on. Slide the masterlink parts through and connect the chain together. If it isn't the right length then you may need to repeat measure and put on some more spare chain or take som off.

Shortening: Put the chain on the front and rear sprocket and pull the tire back till it fits where it should with the rear brakes. Take the chain an pull the slack up onto the sprocket until it is tight. The chain part that is hanging over is the stuff you need to remove. Do so and put the masterlink there if there isn't already one. Than pull back the tire till the slack in the chain is zero and see if thats where the tire fits nicely in between the brakes. If not add on/take off some links and repeat.

I noticed there wasn't a section for doing this when I desparately needed it today so after work I decided that the rest of the BMXing community might need it too. Feel free to add anything that I missed out on. Sorry though for not gettin gpictures though, I will next time I either clean the bike again or put another srpocket on.

Seite 1/1
Dieser Artikel wurde bereits 2331 mal gelesen

Kommentare

Eigenen Artikel veröffentlichen