|Is teflon tape enough on the BB threads?||nova|
May 23, 2002 12:53 PM
|I just installed an Ultegra BB in a Merckx ti frame. I wrapped teflon plumber's tape around the BB threads (no grease), but now I'm wondering: Is that enough? Seems that the tape just gets shredded during the installation.
Wondering if it is worth the effort to pull it out, grease the threads, and reinstall.
|Teflon tape is best on pipe threads||Calvin|
May 23, 2002 1:13 PM
|The teflon-type tapes are used a lot in water fittings and pipe threads. These tend to be course threads. The BB threads are relatively fine. While you can of course use procedures from different fields, the tape does tend to get shredded as you have noted. |
You might consider using anti-seize, especially with the titanium frame you have.
May 23, 2002 2:48 PM
|Teflon tape works fine for BB's - and there are a lot of wrenches that will back it up. Lots of us have tried all sorts of things and found that teflon tape is the cheapest, easiest and most cost effective solution. Did I mention that it works? The tape doesn't do it's by staying all intact so you can roll it back up again and save it. It's thin so that you can build up some layers then have it get all smeared inbetween the threads and do it's job. Hey you can stuff a bunch of Loctite in there also, but I wouldn't advise it. The key is to use a torque wrench or it's all for nothing. |
Just what problem are you trying to solve - seems like self doubt is at the top of the list.
|how the heck do ya do it?||James|
May 23, 2002 10:03 PM
|I have the Dura Ace 7700 BB(with a Kestrel 200Sci) and the park lockring wrench for tightening it. How do you measure torque with that(very annoying) wrench? Does park make a square drive tool for use with a torque wrench? I'm having a hell of a time with a loud creek! I used Teflon tape to try and stop it, but it came back soon after. I have thought of just buying the Ultegra BB and using Teflon tape. Any suggestions would be great. Thanks.......James|
May 24, 2002 8:47 AM
|Well, the DA BB is a bit of a pain. You torque in the cup on the drive side, then you have to fiddle with the preload on the non-drive side. Finally, you have to guesstimate the lockring. I think someone makes a "crow's foot" style the will hook up to a torque wrench, but I do it by feel. Part of the deal is that you need to hold the cup stationary with one wrench while you crank the lockring down with another. It really is a tad on the tricky side getting a DA BB all set up - for some people going to an Ultegra unit is a much better choice - you give up something like 1.5 oz., but you gain all sorts of convenience. |
Recently had a bunch of creaking on my buddy's 200SCi and we determined that it was actually his seat post contacting the waterbottle boss on the seat tube. Lots of time people mistakenly credit the BB for the creaking noise when in reality it's coming from somewhere else. The reason why we get fooled is b/c it's associated with hard pedaling and sound travels much faster though solids than in air. We have a hard time telling where it's coming from when the whole bike acts as a sound board.
May 24, 2002 4:39 AM
|Teflon tape, while not really necessary on aluminum or steel BB shells (unless their is a pronounced creak that won't go away), is a requirement IMHO on a ti shell. I don't know why, or what it does, I just know that it works. It is the second most important ingrediant for installing a BB, AFTER proper torque, which is absolutely the most important. The original poster mentions somewhere that he's using the park lockring tool- there is NO WAY you are getting the proper torque with this tool (on the drive side). Park (or maybe it's Shimano) makes a square drive BB tool, and that should be used in combination with a torque wrench for all BB installation.|
|No matter what you use||Kerry|
May 23, 2002 5:37 PM
|Be sure to re-do it on some regular basis (annually is good). I've had no problems using grease (and proper torque) though I did use teflon tape once. Using grease prevents seizing and oxidation. Tape is probably not as good for that. But even grease needs to be re-done occasionally.|
|re: Is teflon tape enough on the BB threads?||Akirasho|
May 23, 2002 5:54 PM
|I'm not a professional wrench, but I build up my own frames and ...I swear by teflon tape... especially in BB installations.
No, the tape does not shred but small sections can abrade a bit... I generally use just a bit of grease as well because of dissimilar metals, but you're probably safe for the immediate future (I doubt that you'd get any cold welding).
The tape works on threads regardless of coarseness due to a very elastic and flexible base material (probably mylar) and the teflon particles (non stick). It also appears to be inert... unlike greases or anti seize compounds, I've not seen any interaction (0xidation) with materials wrapped with said. It's easily one of the best "tools" in my toolkit both in performance and cost.
Remain In Light.