Frame spreader tool idea.

Trey · Feb 12, 2015

Feel free to move this if I've gotten it wrong. When I think chains, I think clearance.

This gadget popped into my head today. I'd think it would be pretty easy to fab up.

The ends are pipe, cut lengthwise. One is fixed to the end of a threaded rod, the other, the end of a threaded pipe. The nut on the threaded rod is free, and presses against the big washer to its right, which is fixed, like the nut on the threaded tube. Wrench-widen, wrench-widen...

Any suggestions on bettering the design?

KCvale · Feb 12, 2015

The problem is spreading the rear dropouts needs to be equal on both sides.
When one side is fixed and the other side spreads, it tends to just move the adjustment side.

If both sides could spread you could do one turn on one side, then another turn on the other side.

That won't be perfect either but close enough for MB use I'd think.
We just use a small jack and flip the frame over a couple times while we spread it to give each side equal fixed spots.

Trey · Feb 12, 2015

I'm thinking that I will hang the bike on my lift, and use this, and that would let it expand equally. Possibly adding a ratchet strap at the rear, to create a slight bow.
I'm sick of the jack, flip, jack process

bluegoatwoods · Feb 12, 2015

Yes. I use a scissors jack.

But my hat's off to you for exercising the ol' brain muscle. Nice job!

bluegoatwoods · Feb 12, 2015

Oh....one other thing.

Just take an axle out of a wheel that you're not using. Bolt it into the dropouts of the frame you're spreading.

This gives you that 'bow' you're looking for and keeps the dropouts at the right distance from each other to accept your wheel.

2door · Feb 12, 2015

Here's one I threw together in about 10 min. It's just a 1/4" aluminum turn-buckle with a couple of roughly made 'U' shaped things on the ends of the threaded sections.

I have to disagree with KC in that the frame won't spread evenly. I've never had that problem.

Tom

Trey · Feb 12, 2015

bluegoatwoods said:
Oh....one other thing.

Just take an axle out of a wheel that you're not using. Bolt it into the dropouts of the frame you're spreading.

This gives you that 'bow' you're looking for and keeps the dropouts at the right distance from each other to accept your wheel.

By way of Illinois, a fantastic solution. Thank you sir!

Tom- I promise, someday, I will think of something that you haven't already done.

Davezilla · Feb 14, 2015

I've posted this before but I'll post it again... just use a small block Chevy exhaust manifold spreader, it's already the right size and shape to do these, it's cheap and pre made...
just Google "small block Chevy exhaust manifold spreader" and you'll see exactly what I'm talking about.

No need to worry if on side opens more than the other, it's a bicycle not the space shuttle... and I've never had nor heard of that problem either.

Trey · Feb 14, 2015

Sounds good. I'll look that up, thanks!
I've had the un-equal spread problem myself. Had to turn it over and jack again... but I've got other things to do, this is a problem I can fix.

Intrepid Wheelwoman · Feb 14, 2015

Davezilla said:
I've posted this before but I'll post it again... just use a small block Chevy exhaust manifold spreader, it's already the right size and shape to do these, it's cheap and pre made...
just Google "small block Chevy exhaust manifold spreader" and you'll see exactly what I'm talking about.

No need to worry if on side opens more than the other, it's a bicycle not the space shuttle... and I've never had nor heard of that problem either.

Now that is a really useful looking tool

Trey · Feb 21, 2015

Dave, it took me a little longer than I thought to look up that tool, and wow!
Just goes to show that everythings' already been thought of! I couldn't build it that cheap, and it wouldn't be as good. Thanks for the info.

MotoMagz · Feb 21, 2015

I like to use the old wood clamp.Lots of area touching and it spreads stays and rear dropouts.It has plenty of control to spread both sides equally . You know the type with the 2 blocks of wood and 2 control handles. Sorry my phone won't download a picture to this site.

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Frame spreader tool idea.

Trey

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KCvale

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Trey

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bluegoatwoods

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2door

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Trey

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Trey

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Intrepid Wheelwoman

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