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Replacing Crank Set
I am about to replace the Bontrager Race crankset and BB on my Trek
2100 with Shimano Ultegra cranks and BB. Can anyone advise me on the tools I will need to do this and also if there are any pitfalls to watch out for? |
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#2
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Replacing Crank Set
On Mon, 28 Nov 2005 17:55:09 -0800, cobra46 wrote:
I am about to replace the Bontrager Race crankset and BB on my Trek 2100 with Shimano Ultegra cranks and BB. Can anyone advise me on the tools I will need to do this and also if there are any pitfalls to watch out for? Many bottom brackets require a specific tool to fit the splines of the bottom bracket. You may or may not need two such tools, one for the Bontrager and the other for the Shimano. Check with either a website or your LBS to be sure. But you will certainly need one. The good news is that they are cheap. The right cup is left-hand thread, and the "cup" will be very tight. The left side has right-hand (normal) threads, and will be less difficult to remove. I assume that your new bottom bracket is a cartridge type. These typically have the right-side threaded cup attached to the bottom bracket itself, with the left side cup loose. But the other popular type, with more separate sides, is similar. If you have a loose-bearing cup and cone system, it takes a few more steps. Wrap teflon tape (used for plumbing) around both threaded portions of the cups. When putting the new one in, start with the left side cup -- or holder. Put it in loosely, just engage the threads. Then, the right side will slide in, bottom bracket and all, and the shaft will fit through the left side holder. Begin tightening the right side (backwards), making sure the threads are properly engaged. Then tighten each side, alternately, tightening down the right side first, with some force, then the left. You should make the bottom bracket quite tight, and it should be easy to do until the very end. If the pieces do not easily thread onto the frame, either the threads are bad, or you have it improperly threaded. The latter is very easy to do, so take care with that part. -- David L. Johnson __o | Let's be straight here. If we find something we can't _`\(,_ | understand we like to call it something you can't understand, or (_)/ (_) | indeed even pronounce. -- Douglas Adams |
#3
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Replacing Crank Set
Thanks David. That is very helpful. Can you give me an idea of how
long it should take assuming I have all the right tools and compnents? David L. Johnson wrote: On Mon, 28 Nov 2005 17:55:09 -0800, cobra46 wrote: I am about to replace the Bontrager Race crankset and BB on my Trek 2100 with Shimano Ultegra cranks and BB. Can anyone advise me on the tools I will need to do this and also if there are any pitfalls to watch out for? Many bottom brackets require a specific tool to fit the splines of the bottom bracket. You may or may not need two such tools, one for the Bontrager and the other for the Shimano. Check with either a website or your LBS to be sure. But you will certainly need one. The good news is that they are cheap. The right cup is left-hand thread, and the "cup" will be very tight. The left side has right-hand (normal) threads, and will be less difficult to remove. I assume that your new bottom bracket is a cartridge type. These typically have the right-side threaded cup attached to the bottom bracket itself, with the left side cup loose. But the other popular type, with more separate sides, is similar. If you have a loose-bearing cup and cone system, it takes a few more steps. Wrap teflon tape (used for plumbing) around both threaded portions of the cups. When putting the new one in, start with the left side cup -- or holder. Put it in loosely, just engage the threads. Then, the right side will slide in, bottom bracket and all, and the shaft will fit through the left side holder. Begin tightening the right side (backwards), making sure the threads are properly engaged. Then tighten each side, alternately, tightening down the right side first, with some force, then the left. You should make the bottom bracket quite tight, and it should be easy to do until the very end. If the pieces do not easily thread onto the frame, either the threads are bad, or you have it improperly threaded. The latter is very easy to do, so take care with that part. -- David L. Johnson __o | Let's be straight here. If we find something we can't _`\(,_ | understand we like to call it something you can't understand, or (_)/ (_) | indeed even pronounce. -- Douglas Adams |
#4
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Replacing Crank Set
On Mon, 28 Nov 2005 19:09:44 -0800, cobra46 wrote:
Thanks David. That is very helpful. Can you give me an idea of how long it should take assuming I have all the right tools and compnents? Well, in theory it shouldn't take long at all, but things always take longer than they should. Assuming no hassles, an hour? plus time to re-adjust the front derailleur, which depends on change in chainline, chainring sizes, etc. Worst-case, maybe it will take time and penetrating oil to remove the old bottom bracket. Maybe you will get something cross-threaded and need to take it to a shop to have the threads chased. Maybe the new chainline will be terrible (this you usually avoid if the parts are meant for the application) and you will need to add spacers. But usually none of this will happen. BTW, I forgot, you will also need a tool to remove the cranks from the shaft, if you don't already have that. And there is a possibility that you need a new one for the new cranks, though that won't prevent you from installing the new cranks. -- David L. Johnson __o | "Business!" cried the Ghost. "Mankind was my business. The _`\(,_ | common welfare was my business; charity, mercy, forbearance, (_)/ (_) | and benevolence, were, all, my business. The dealings of my trade were but a drop of water in the comprehensive ocean of my business!" --Dickens, "A Christmas Carol" |
#5
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Replacing Crank Set
cobra46 wrote:
I am about to replace the Bontrager Race crankset and BB on my Trek 2100 with Shimano Ultegra cranks and BB. Can anyone advise me on the tools I will need to do this and also if there are any pitfalls to watch out for? If my recent experience is in any way typical, the splines on the cranks are made from cheese. Be very careful to get 'em lined up properly with those on the BB axle. That machine now has a Campag chainset... -- Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/ The entire population of Uxbridge has no idea that it actually doesn't exist. |
#6
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Replacing Crank Set
David L. Johnson wrote: On Mon, 28 Nov 2005 17:55:09 -0800, cobra46 wrote: I am about to replace the Bontrager Race crankset and BB on my Trek 2100 with Shimano Ultegra cranks and BB. Can anyone advise me on the tools I will need to do this and also if there are any pitfalls to watch out for? Many bottom brackets require a specific tool to fit the splines of the bottom bracket. You may or may not need two such tools, one for the Bontrager and the other for the Shimano. Check with either a website or your LBS to be sure. But you will certainly need one. The good news is that they are cheap. The right cup is left-hand thread, and the "cup" will be very tight. The left side has right-hand (normal) threads, and will be less difficult to remove. I assume that your new bottom bracket is a cartridge type. These typically have the right-side threaded cup attached to the bottom bracket itself, with the left side cup loose. But the other popular type, with more separate sides, is similar. If you have a loose-bearing cup and cone system, it takes a few more steps. Wrap teflon tape (used for plumbing) around both threaded portions of the cups. When putting the new one in, start with the left side cup -- or holder. Put it in loosely, just engage the threads. Then, the right side will slide in, bottom bracket and all, and the shaft will fit through the left side holder. Begin tightening the right side (backwards), making sure the threads are properly engaged. Then tighten each side, alternately, tightening down the right side first, with some force, then the left. Remember to grease, both inside the left cup and inside the BB shell. Much more essential than teflon tape, which I seldom use.... You should make the bottom bracket quite tight, and it should be easy to do until the very end. If the pieces do not easily thread onto the frame, either the threads are bad, or you have it improperly threaded. The latter is very easy to do, so take care with that part. -- David L. Johnson __o | Let's be straight here. If we find something we can't _`\(,_ | understand we like to call it something you can't understand, or (_)/ (_) | indeed even pronounce. -- Douglas Adams |
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