Frame question: is this normal
02-10-07, 06:16 PM
#1
RacingBear
Thread Starter
Frame question: is this normal
So I was cleaning my bike today, bought it last month, and noticed a whole on the none drive side of the rear triangle. Is this normal, and what is it for? This is a 2007 CAAD8 frame.
Picture:
Thanks.
Picture:
Thanks.
02-10-07, 06:17 PM
#2
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Worms. Check the other side - if there's no hole, don't eat it.
Just kidding. Looks like drainage/venting. I wouldn't worry about it.
Just kidding. Looks like drainage/venting. I wouldn't worry about it.
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02-10-07, 07:17 PM
#4
RacingBear
Thread Starter
I don't think I had that whole on my two other bikes, one of the was with 2006 CAAD8. Not really worried, well maybe a little, but very curious what it's for.
02-10-07, 07:31 PM
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Originally Posted by UmneyDurak
I don't think I had that whole on my two other bikes, one of the was with 2006 CAAD8. Not really worried, well maybe a little, but very curious what it's for.
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02-13-07, 08:06 AM
#7
RacingBear
Thread Starter
Yep, you guys were right. This is a vent hole for welding.
Last edited by UmneyDurak; 02-14-07 at 01:46 PM.
02-13-07, 08:30 AM
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Originally Posted by UmneyDurak
Yep, you guys were right. This is a vent whole for welding.
Rant over.
02-13-07, 09:24 AM
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Originally Posted by JackTheLadd
Ok, sorry to be a grammar/vocabulary Nazi, but it's a "hole", not a "whole".
Rant over.
Rant over.
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02-14-07, 07:23 PM
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Where is it. Is it inside the left chain stay?
I assume the bike has vertical dropouts (I can't see from the web picture), and therefore that the wheel hasn't been mis-aligned. However if the wheel is badly out of true or if you broke a spoke and had some tire rub or if you installed a too large tire, then the tire may have rubbed on the chain stay.
Is it safe? I think you would need to compare with a new frame to see what is the shape of a normal left chainstay. The photo doesn't tell us if you just rubbed a bit of paint or if you removed a real amount of material. And even if there is little material removed, the tube might have been flattened and ovalized; comparing it to a brand new one would tell you whether or not that's the case.
As for the hole, check first to see if the metal is thick – and therefore it is a genuine hole – or if feels like metal thinned until there is nothing left. Another sure sign would be to check whether you have one on the right side and if a new frame has it.
Now a new frame might have a painted-on hole, so if you see or feel (with your hand) a dimple around that place, you might well have a brazing vent hole that was plugged and painted over.
BTW, I'm NOT giving out a diagnostic at a distance. If you have a good bike shop, they might be able to assess the situation.
I assume the bike has vertical dropouts (I can't see from the web picture), and therefore that the wheel hasn't been mis-aligned. However if the wheel is badly out of true or if you broke a spoke and had some tire rub or if you installed a too large tire, then the tire may have rubbed on the chain stay.
Is it safe? I think you would need to compare with a new frame to see what is the shape of a normal left chainstay. The photo doesn't tell us if you just rubbed a bit of paint or if you removed a real amount of material. And even if there is little material removed, the tube might have been flattened and ovalized; comparing it to a brand new one would tell you whether or not that's the case.
As for the hole, check first to see if the metal is thick – and therefore it is a genuine hole – or if feels like metal thinned until there is nothing left. Another sure sign would be to check whether you have one on the right side and if a new frame has it.
Now a new frame might have a painted-on hole, so if you see or feel (with your hand) a dimple around that place, you might well have a brazing vent hole that was plugged and painted over.
BTW, I'm NOT giving out a diagnostic at a distance. If you have a good bike shop, they might be able to assess the situation.
