Bike frame tube too big!

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Ok so quick question. So I came up with this idea out of frustration with the mounting adapter plate. So the tube going up to the headset where the front (exhaust side) of the motor mounts to is too fat. So I've always had to use the adapter which I just can't stand using because of how high the motor has to sit. Now the engine mount posts need about 6mm on each side to clear the frame. My idea is to cut out a flat side to each side of the tube and just fill it in with welded flat ⅛ inch plate so the posts just slide through that slimmer channel over the tube. Here's a very poor top down illustration. I'm definitely not a structural engineer but I tend to think this would not dangerously weaken the integrity of the frame. Opinions?
 

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I... personally... wouldn't do it. There are too many bike frames out there to be had for cheap or free...
Hey just in case you were curious, you just might have been right about not cutting into the frame. Man what ever steel they use in that 1/16 in tubing is either crap or my welding skill is crap. That s**t just wanted to blow tf out! But its done now so we shall see what happens. Who knows maybe it'll hold up.
 

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Hey just in case you were curious, you just might have been right about not cutting into the frame. Man what ever steel they use in that 1/16 in tubing is either crap or my welding skill is crap. That s**t just wanted to blow tf out! But its done now so we shall see what happens. Who knows maybe it'll hold up.
Just thinking, next time you might want to think about heating the tube and using a fuller to precisely nock it in a little for the studs to fit. I was just thinking that way you wouldn't loose any material? I know I'm probably asking for it...
Probably wouldn't want to ruin the paint on a new bike...
 
Ok so quick question. So I came up with this idea out of frustration with the mounting adapter plate. So the tube going up to the headset where the front (exhaust side) of the motor mounts to is too fat. So I've always had to use the adapter which I just can't stand using because of how high the motor has to sit. Now the engine mount posts need about 6mm on each side to clear the frame. My idea is to cut out a flat side to each side of the tube and just fill it in with welded flat ⅛ inch plate so the posts just slide through that slimmer channel over the tube. Here's a very poor top down illustration. I'm definitely not a structural engineer but I tend to think this would not dangerously weaken the integrity of the frame. Opinions?
Just smack each side of the frame with a big hammer & a piece of 1/2" thick flat plate stood on end. It will make a nice divot on each side of the frame for the studs to pass by. Quick & easy! Like Dirty Mcquiver!!🤣😂🤣
 
I personally wouldn't have done that. It should hold up just fine if you aren't going super fast, and even more so if you get a suspension fork.

I would probably get a. Exhaust clamp the same diameter of the tube, drill your holes where the mounts need to be, and use the clamp the mount.
 
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