Bol Maaaaaaing Posted June 3, 2009 Report Share Posted June 3, 2009 (edited) I've got these two holes on my frame that Im not sure what they are for.Can anyone tell me what they are for?Its the one on the chainstay....Thanks for the help Edited June 3, 2009 by Bol Maaaaaaing Quote Link to comment Share on other sites More sharing options...
JT! Posted June 3, 2009 Report Share Posted June 3, 2009 They are to let all the gasses and crap out when they get welded. Also you'd end up with funny air pressures in fully sealed tubes which might jeopardize the strength.(I don't know that for fact, best guess). Quote Link to comment Share on other sites More sharing options...
Bol Maaaaaaing Posted June 3, 2009 Author Report Share Posted June 3, 2009 They are to let all the gasses and crap out when they get welded. Also you'd end up with funny air pressures in fully sealed tubes which might jeopardize the strength.(I don't know that for fact, best guess).Ok. I was hoping it was for hydrolic rim brakes Although I pretty much knew that wasnt the case. Quote Link to comment Share on other sites More sharing options...
Chris - Burman Posted June 3, 2009 Report Share Posted June 3, 2009 Ok. I was hoping it was for hydrolic rim brakes Although I pretty much knew that wasnt the case.Mayy be a little on the small side i think Quote Link to comment Share on other sites More sharing options...
Leistonbmx Posted June 3, 2009 Report Share Posted June 3, 2009 It's so the tubes can "breath" when being welded.Why would they be for hydro rim brakes? Quote Link to comment Share on other sites More sharing options...
Pashley26 Posted June 3, 2009 Report Share Posted June 3, 2009 Why would they be for hydro rim brakes?Some bikes have the cables running through the frame.I'd drill them out a bit then run the hoses through there if thats what you wanted to do ? Quote Link to comment Share on other sites More sharing options...
Revolver Posted June 3, 2009 Report Share Posted June 3, 2009 Some bikes have additional holes because parts of them are factory standard. Example, my inspired has holes on the dropouts to put a pannier rack, because they're dropouts chosen from a catalog. Quote Link to comment Share on other sites More sharing options...
Ross McArthur Posted June 3, 2009 Report Share Posted June 3, 2009 May they be for a jig of some sort to be placed through to hold it for the painting process? Quote Link to comment Share on other sites More sharing options...
Simpson Posted June 3, 2009 Report Share Posted June 3, 2009 Example, my inspired has holes on the dropouts to put a pannier rack, because they're dropouts chosen from a catalog.Yea everyone at the local bike shop were pissing themselves over that fact.... they were trying to make me buy a shopping basket and try to ride Quote Link to comment Share on other sites More sharing options...
AdamR28 Posted June 3, 2009 Report Share Posted June 3, 2009 They are to let all the gasses and crap out when they get welded. Quote Link to comment Share on other sites More sharing options...
Bol Maaaaaaing Posted June 4, 2009 Author Report Share Posted June 4, 2009 It's so the tubes can "breath" when being welded.Why would they be for hydro rim brakes?I know. I just want some bad... Quote Link to comment Share on other sites More sharing options...
LukasMcNeal Posted June 4, 2009 Report Share Posted June 4, 2009 Yea everyone at the local bike shop were pissing themselves over that fact.... they were trying to make me buy a shopping basket and try to ride Haha. Quote Link to comment Share on other sites More sharing options...
Yorkshire Dale Posted June 4, 2009 Report Share Posted June 4, 2009 Ok. I was hoping it was for hydrolic rim brakes Although I pretty much knew that wasnt the case.learn to spell hydraulic!!! Quote Link to comment Share on other sites More sharing options...
Muel Posted June 4, 2009 Report Share Posted June 4, 2009 Speed holes? Quote Link to comment Share on other sites More sharing options...
Rob Leech Posted June 4, 2009 Report Share Posted June 4, 2009 They're to realease the purge gas used in welding, if the tube wasn't purged whilst being welded, the weld would either sink or sagg inside the tube, and there would more than likely be both lack of fusion and penetration.The inert gases used create a sort of pressurised seal that stop the weld from sagging (lack of fusion) or sinking (lack of penetration) .Josh. Quote Link to comment Share on other sites More sharing options...
LukasMcNeal Posted June 4, 2009 Report Share Posted June 4, 2009 (lack of penetration)Haha legend! Quote Link to comment Share on other sites More sharing options...
Guest Posted June 4, 2009 Report Share Posted June 4, 2009 To reduce weight Quote Link to comment Share on other sites More sharing options...
LukasMcNeal Posted June 4, 2009 Report Share Posted June 4, 2009 To reduce weight +1 Quote Link to comment Share on other sites More sharing options...
Mark W Posted June 4, 2009 Report Share Posted June 4, 2009 Some bikes have the cables running through the frame.I'd drill them out a bit then run the hoses through there if thats what you wanted to do ?I'd imagine running your cables through your downtube, somehow past your BB, through a solid BB yoke and then out through your chainstays would probably be fairly hectic. Quote Link to comment Share on other sites More sharing options...
Pashley26 Posted June 5, 2009 Report Share Posted June 5, 2009 I'd imagine running your cables through your downtube, somehow past your BB, through a solid BB yoke and then out through your chainstays would probably be fairly hectic.I know, I was thinking more of the top tube and seat stays approach as per specialized transition road bikes etc.... Quote Link to comment Share on other sites More sharing options...
Bol Maaaaaaing Posted June 5, 2009 Author Report Share Posted June 5, 2009 learn to spell hydraulic!!!Im sorry for any feelings hurt through my incorrect spelling of the word "Hydraulic".I just spelt it the way it sounds! Quote Link to comment Share on other sites More sharing options...
Bronz Posted June 5, 2009 Report Share Posted June 5, 2009 I'm pretty sure it's to do with powder coating too—they heat the frame right up before they treat it so if it was sealed it would likely explode when the trapped air inside heats and expands. I think. Quote Link to comment Share on other sites More sharing options...
Guest Posted June 5, 2009 Report Share Posted June 5, 2009 No its defonantely to reduce weight . Quote Link to comment Share on other sites More sharing options...
davey1991 Posted June 5, 2009 Report Share Posted June 5, 2009 I'm pretty sure it's to do with powder coating too—they heat the frame right up before they treat it so if it was sealed it would likely explode when the trapped air inside heats and expands. I think.What are you talking about? Powder coating is done using a static charge that allows the powder to "stick" to the metal, the frame is then baked in a huge kiln/oven to harden the coating.The holes wouldn't have anything to do with that.No its defonantely to reduce weight .Please tell me your not being serious?As has been said its for welding purposes and also allows water to leave the frame. Quote Link to comment Share on other sites More sharing options...
Bronz Posted June 5, 2009 Report Share Posted June 5, 2009 What are you talking about? Powder coating is done using a static charge that allows the powder to "stick" to the metal, the frame is then baked in a huge kiln/oven to harden the coating.The holes wouldn't have anything to do with that. Dude you didn't take that too well! I've always been told it has something to do with powder coating and heat treating it either before or after it's coated. If I'm wrong I humbly apologise, please please forgive me! Quote Link to comment Share on other sites More sharing options...
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