I need to put on a 36 tooth sprocket
05-26-04, 11:15 AM
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I need to put on a 36 tooth sprocket
but, i dont know how to take off my 1pc cranks(I am upgrading to a 3pc once i get the money). I want to put this sprocket on without messing up my whole bike.If you need any further info please tell me.
05-26-04, 12:12 PM
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You take off 1 pc cranks by undoing the lockrings and bearings at the left end of the bottom bracket but I dont think you can upgrade to a 3 pc crank because the BB for the 1 pc crank is a larger diameter. Look up on Sheldon Brown for more details.
https://www.sheldonbrown.com/opc.html
https://www.sheldonbrown.com/opc.html
05-26-04, 10:08 PM
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i'm assuming this is a BMX bike, if this is the case, a 3-piece BMX crank will fit the frame. they all (supposedly) use the same standard for BB shells (except the companies who are now using euro BBs, but you don't have to worry about that). the problem that most people run into with BMX bikes and installing new cranks is that, while most companies use the same outside diameter, the INSIDE diameters can vary slightly...so, a primo BB cup will fit a T-1 frame a little tighter than, say, a torker BB cup, and both will slide into a dyno frame really easy...but they all fit.
but yeah, as AndrewP said, remove the locknut and ring from the non-drive side of the bottom bracket. the ring will be slotted, and you'll either need ot use the special tool, or a flathead screwdriver and mallet will work just fine. just remember that that hardware threads on and off the opposite direction of normal hardware. so...uh...righty-loosy, lefty-tighty. you should just wait until you get the 3-piece cranks to put the sprocket on.
do you have a cassette rear hub? if not, then you're pretty much limited to a 16T freewheel in the rear. i don't know what your preference might be, but you're probably jumping down from a 44 or 43T sprocket to the 36. which will make it really easy to pedal, and it might feel funky for a while...you'll also need to shorten the chain. the best way to do this is with a chain tool. i used to use a flathead and a mallet to break the chains...works okay if you have a masterlink and you don't mess up the links too bad...but really, a chain tool is well worth the money if you don't have one already.
you also might not be able to use the 36T with a one piece at all...the hole that the crank spindle goes through might not be large enough for the cranks. having switched cranks and sprockets on my BMX bikes a bunch of times, and helped out friends with it, it can be a pain...especially if you're just taking the 1-pc cranks off, switching the sprocket, then putting it all back together again. if you don't have the right tools and grease for the 1-pc BB, it'll be really hard to get it adjusted properly again. plus, you never know what you'll find in there once you open it up. the bearings could be completely loose, or the races holding the bearings could be all broken to hell and you'll have to get new races, or it could be fine. you should just wait and do it all at once.
if you decide to do it on your own, just be sure to make a note of which direction the bearing races were facing when you took it all apart, and if they're loose, note how many go on each side.
but yeah, as AndrewP said, remove the locknut and ring from the non-drive side of the bottom bracket. the ring will be slotted, and you'll either need ot use the special tool, or a flathead screwdriver and mallet will work just fine. just remember that that hardware threads on and off the opposite direction of normal hardware. so...uh...righty-loosy, lefty-tighty. you should just wait until you get the 3-piece cranks to put the sprocket on.
do you have a cassette rear hub? if not, then you're pretty much limited to a 16T freewheel in the rear. i don't know what your preference might be, but you're probably jumping down from a 44 or 43T sprocket to the 36. which will make it really easy to pedal, and it might feel funky for a while...you'll also need to shorten the chain. the best way to do this is with a chain tool. i used to use a flathead and a mallet to break the chains...works okay if you have a masterlink and you don't mess up the links too bad...but really, a chain tool is well worth the money if you don't have one already.
you also might not be able to use the 36T with a one piece at all...the hole that the crank spindle goes through might not be large enough for the cranks. having switched cranks and sprockets on my BMX bikes a bunch of times, and helped out friends with it, it can be a pain...especially if you're just taking the 1-pc cranks off, switching the sprocket, then putting it all back together again. if you don't have the right tools and grease for the 1-pc BB, it'll be really hard to get it adjusted properly again. plus, you never know what you'll find in there once you open it up. the bearings could be completely loose, or the races holding the bearings could be all broken to hell and you'll have to get new races, or it could be fine. you should just wait and do it all at once.
if you decide to do it on your own, just be sure to make a note of which direction the bearing races were facing when you took it all apart, and if they're loose, note how many go on each side.
