|hairline crack in lug - should I panic ?||dotkaye|
Jun 5, 2001 12:07 PM
|I have a Japanese steel frame, Tange tubing. Washing it on Sun after a wet morning's ride, I noticed there is a hairline crack about 1/4" long, in the lug that joins the seat tube to the bottom bracket. It's on the upper edge of the lug, not quite between the lug and the tube. I was hoping to keep this bike for another few years, but maybe it's time.. opinions ? |
Jun 5, 2001 12:38 PM
|Anytime that there may be structural damage to a frame like you describe it is time for retirement of said frame. Where the seat tube meets the bottom bracket is a high stress area that gets a lot of torque from the pedals. There is a chance that this crack could develop into something much worse from this torque, possibly even a complete failure of the lug. I wouldn't take the chance in trying to get more time out of the frame. IMHO|
|you sure it's not the paint?||Hank|
Jun 5, 2001 1:02 PM
|you sure it's not just a crack in the paint? Might take it to a good shop or framebuilder for an opinion. Otherwise, I'd just watch it closely and perhaps start shopping around for a new bike. It's never a bad idea to have 2+ bikes, anyway. But I doubt you'd have some sort of major failure - bars, stems and forks are much more of a problem if they break. I had a friend who broke his downtube and all he noticed was that the bike suddenly got a bit more comfortable, but handled somewhat strangely (apparently, this is how the Slingshot bikes were invented).
|It is worth removing the paint to see ...||Humma Hah|
Jun 5, 2001 7:11 PM
|... none of the inspection methods, be it dye penetrant, magneflux, etc, will work until the paint is removed. I can usually spot a crack by eye, with a little magnification, but I had about 15 years in the business.
If the part is powdercoated instead of painted, my bet would be there's either a crack there or one will soon appear. Powdercoat bonds so well that every time I've ever seen a crack develop in it in tests, the part soon fails.
|turns out the answer is yes..||dotkaye|
Jun 6, 2001 10:51 AM
|after hearing untoward noises on today's ride, the crack is now an inch longer, and extends deep into the lug itself. Hum. Anyone have a nice (cheap) 59cm frame for sale ? |
Meantime I guess it's back to the Schwinn Continental luxury ride for me..