How to ruin a perfectly good stock frame

[mlc216]

Find some tubing:

Stare at the frame for a while:

Cut it randomly:

Change something:

Try to figure out how to put it back together:

[mlc216]

I like my frames straight:

Decided to go with a Harley style neck and a single downtube:

Cut off paper thin stock backbone, weld on new heavy wall backbone, build seatstays, clamp on your favorite tank and call it a night:

[mike-s]

this is getting interesting very quickly

[Guest]

That's looking clean for sure... which I know is your main aim

Bit distracted at the moment watching a certain Mr Stoner spin it up sideways out of the corners at Catalunya... man I wish I could ride like that!

[Nessism]

Your craftsmanship and vision looks good to me, but the execution from a structural standpoint looks very scary. I'd pull out those main tubes and get some at least 1/2" diameter larger (maybe more).

[mlc216]

The tubing is much much heavier wall thickness than stock. It's also bigger than the tubing that makes up my current frame that I've been riding. I appreciate the concern but I assure you that when finished this frame will be much stronger than a stock gs frame.

[Nessism]

The tubing is much much heavier wall thickness than stock. It's also bigger than the tubing that makes up my current frame that I've been riding. I appreciate the concern but I assure you that when finished this frame will be much stronger than a stock gs frame.

I seriously doubt that. Triangulation and outside diameter of the tube is what gives the frame it's strength and stiffness. By using those skinny tubes, even though they may be thick, and getting rid of the double down tubes and triangulation in the head tube area, that frame of yours is going to be a noodle compared to stock.

[chuck hahn]

Gonna weld in any gussets at the critical joint areas???

[mlc216]

I seriously doubt that. Triangulation and outside diameter of the tube is what gives the frame it's strength and stiffness. By using those skinny tubes, even though they may be thick, and getting rid of the double down tubes and triangulation in the head tube area, that frame of yours is going to be a noodle compared to stock.

You're right it will be a total noodle just like every stock Harley frame from the 1930's on. I guess I'll just take my engineering degree back to the university and tell them it's worthless.

But seriously I'm not building a sport bike. It won't be built to dive into corners at 100mph. I'm sorry for bringing this trash to your board and offending you and your 17 suzukis.

If anyone else wants to see how it turns out let me know and I'll think about posting more pictures.

[mlc216]

And btw the tubing for the backbone, downtube, and backbone support are the same OD as the original backbone. The rest of the hardtail is 1" DOM tubing.

[Agemax]

i say GO FOR IT mate, its looking good and reckon it will look great when finished. keep it up and get the pics coming in as you progress

[Nessism]

You're right it will be a total noodle just like every stock Harley frame from the 1930's on. I guess I'll just take my engineering degree back to the university and tell them it's worthless.

But seriously I'm not building a sport bike. It won't be built to dive into corners at 100mph. I'm sorry for bringing this trash to your board and offending you and your 17 suzukis.

If anyone else wants to see how it turns out let me know and I'll think about posting more pictures.

Dude, I don't really care what you do but your claim "... but I assure you that when finished this frame will be much stronger than a stock gs frame" is BS.

[mlc216]

Strength and stiffness are different things. Hardtails are built to flex, otherwise they would break from fatigue stresses over years of riding.

My frame may flex more, but the stock frame would pop first in a testing facility as far as overall STRENGTH goes.

[mlc216]

No more swingarm. Chainstays are in...

[mlc216]