Due to paint I munged the first few mm of the thread for the rear derailleur. Threaded hole on the frame I mean. Any way to correct it? /Mikael
Sometimes it can be as easy as threading the bolt in from the backside. If the bolt material is stronger than the drop-out material this can sometimes "re-tap" it. "Mikael Seierup" <[email protected]> wrote in message news:[email protected] berlin.de... > Due to paint I munged the first few mm of the thread for the rear derailleur. > Threaded hole on the frame I mean. Any way to correct it? > > /Mikael --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.591 / Virus Database: 374 - Release Date: 2/17/2004
In article <[email protected]>, [email protected] says... > Due to paint I munged the first few mm of the thread for the rear derailleur. Threaded hole on the > frame I mean. Any way to correct it? If you can't re-tap the threads using Bryan's suggestion, There are inserts that can be fitted into the old hole. I think the process is to drill out the derailleur hole. press in a derailleur sized insert. -- Cletus D. Lee Bacchetta Giro Lightning Voyager http://www.clee.org - Bellaire, TX USA -
"Cletus Lee" skrev... > If you can't re-tap the threads using Bryan's suggestion, There are inserts that can be fitted into > the old hole. I think the process is to drill out the derailleur hole. press in a derailleur > sized insert. For now I'll let the LBS worry about it, but if he fails I'll try the insert. Thanks. The other side approach didn't work alas. Just typical it happens five days before someones hopefully buying it. /Mikael
In article <[email protected]>, Mikael Seierup says... > > >"Cletus Lee" skrev... >>If you can't re-tap the threads using Bryan's suggestion, There are inserts that can be fitted >into >>the old hole. I think the process is to drill out the derailleur hole. press in a derailleur >>sized insert. > >For now I'll let the LBS worry about it, but if he fails I'll try the insert. Thanks. The other >side approach didn't work alas. Just typical it happens five days before someones hopefully >buying it. It may not be worth buying for just this one instance, but what you need is a 10 mm by 1 mm metric thread chaser (or tap) for the derailleur hanger (about $5 at www.biketoolssetc.com). I have bent the derailleur hanger on a number of bikes, so I keep a derailleur hanger tool and a thread chaser in my shop. Your LBS will have the chaser. Steve Christensen Midland, MI
Mikey, Best way: buy a tap with the correct thread. run it through the hole from the other end. Cheapie sometmes works way (Don't quote me, I'll deny it!) Run a bolt with the correct thread thru from the other side. If that doesn't work, sometimes, you can grind a flat onto the thread and use that as a one time tap. Good Luck, Tom "Mikael Seierup" <[email protected]> wrote in message news:[email protected] berlin.de... > Due to paint I munged the first few mm of the thread for the rear derailleur. > Threaded hole on the frame I mean. Any way to correct it? > > /Mikael
"Steve Christensen" skrev > It may not be worth buying for just this one instance, but what you need is a 10 mm by 1 mm metric > thread chaser (or tap) for the derailleur hanger (about $5 at www.biketoolssetc.com). I have bent > the derailleur hanger on a number of bikes, so I keep a derailleur hanger tool and a thread chaser > in my shop. Your LBS will have the chaser. Yup, he fixed it for me. I will of course inform the prospective buyer that the thread might be a bit munged so too much removing and refitting of the derailleur is not advisable. But at 2300 DKK or 300 euro for whats basically a new frame with new albeit cheap components you can't get everything. Cheers Mikael
I don't know if it is common practice in the bicycle industry to use Heli-coils to replace ruined threads, but if they are good enough to hold a heavy duty truck transmission in place, I think they might be worth a try. Your local machine shop would be the place to find out.
Dan Burkhart wrote: > I don't know if it is common practice in the bicycle industry to use Heli-coils to replace ruined > threads, but if they are good enough to hold a heavy duty truck transmission in place, I think > they might be worth a try. Your local machine shop would be the place to find out. When a rogue plastic bag demolished the rear derailleur and hanger on thread on Mrs Larrington's Kingcycle, this was the fix that Bikefix applied, so I imagine that a helicoil with that particular threading is fairly easy to get hold of. -- Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/ =========================================================== Editor - British Human Power Club Newsletter http://www.bhpc.org.uk/ ===========================================================
My auto and bike mechanic friends used to call it a "helicoil." -- --Scott "Cletus Lee" <[email protected]> wrote in message news:[email protected]... > In article <[email protected]>, [email protected] says... > > Due to paint I munged the first few mm of the thread for the rear derailleur. > > Threaded hole on the frame I mean. Any way to correct it? > > If you can't re-tap the threads using Bryan's suggestion, There are inserts that can be fitted into > the old hole. I think the process is to drill out the derailleur hole. press in a derailleur sized > insert. > > > -- > > Cletus D. Lee > Bacchetta Giro > Lightning Voyager > http://www.clee.org > - Bellaire, TX USA -
