frame strength?

Depends on your technique...if you do all Seat-out trials stuff...no,
not really at all.
If you land tall drops with your weight on the seat, then it's a bit
more important, but you'd probably break your seatpost first (like in
Universe2)
I think Frame strength is most important for the bails when you let
your uni fall down the cliff edge (Right, Frank?)

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Skippii

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You really need to do more research on these topics. "Like super"
strength is meaningless. You haven't defined what axis, what forced, or
what exactly "like super" strength is. Can I reccomend you do some
research on basic mechanical engineering and apply it to unicycles?

In short, if you have to ask that question, no. If you're engineering a
frame for Ryan Atkins, yes. But there's different types of strong, and
a frame can be amazingly strong in some areas and pitifully weak in
others. Can you pull a frame apart vertically? Can you twist it until
it hits the tire? You get the idea...

--
gerblefranklin

http://gallery.unicyclist.com/Trials-Muni

Nick's main man.

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abbabibble said:

Nik Caffroy's frame looks sorta like an old schwinn frame...

Yeah that is a schwinn frame, with cotterless hub, 2 left bicycle euro
cranks and 2 left primo pedals, he does use a cf miyata which is cool.

Nik's cranks are bent to hell, i rode his uni the day we were all at
gasworks. It was so bad that my foot was slipping off the pedal. Mike
told me Nik is getting a kh hub and crankset. It will be good for him.

-Sabin

--
sabin_a.

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not eat it?"
Flanders - "Well, as melon scratchers go, that's a honey doodle"

'SIXSIXONE' (www.sixsixone.com)
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ok... maybe i should rephrase that question.

how strong is the original schwinn frame? what kind of stresses can it
take before breaking or bending in one way or another?

i just like those frames...

--
abbabibble

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abbabibble said:

ok... maybe i should rephrase that question.

how strong is the original schwinn frame?

Well, it was the only thing I never broke on mine...
My main concern was not so much the frame breaking, but that the
bearing might pop out. Never happened to me, though.
If you bailed and landed on the side of the frame, I could see it
bending very easily, though.

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Schwinn frames are pretty resiliant. That means they're strong, but
they're also flexible. How much flex do you want in your frame?

The smaller the wheel, the better-suited a Schwinn-type frame is to
hold it. As the wheels get bigger, it gets easier and easier for the
tire to scrape the sides. My 45" big wheel has a Schwinn-type frame,
and it acts like a parallelogram in flex.

Consider also that a Schwinn (or Semcycle Deluxe) frame has very
limited freedom of adjustment on seat height. The standard posts have
holes every 1".

I think one of the reasons old Schwinns can take such a beating is
because they *can* flex, which keeps them from denting, breaking or
bending as easily. A tubular frame will dent while a Schwinn frame will
just go "boing." And stay heavy like the nearly-1/8" thick hunk of
steel it is.

I would venture to say that the Schwinn-type frame is *not* the best
kind for any type of high-end unicycling. It is best suited to a
strong, easy-to-manufacture unicycle for general use. And easy as it is
to manufacture, it should be a lot cheaper!

I never heard of a Schwinn bearing popping out. They used to slide
around on the axles, but the bearings were very secure in the frames.

--
johnfoss

John Foss, the Uni-Cyclone
"jfoss" at "unicycling.com" -- www.unicycling.com

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thank you, john. you answered my question EXACTLY. i was hoping to use
it as a 20" trials uni. how big of a tire can these fit?

--
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They can fit 2.5" tires, that's not the problem. They are stupid heavy,
use drilled seatposts, and have esoteric bearings. More trouble than
they're worth, better to just get a yuni.

--
gerblefranklin

http://gallery.unicyclist.com/Trials-Muni

Nick's main man.

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Nik loves his schwinn frame. so much, that he wants me to modify the
bearing holder design so when he gets a kh hub, the bearings will bolt
up to it. the frame does flex like none other, but I'm not sure that is
a bad thing. it will flex instead of bending like yuni frames do. the
flex is not really noticable while riding, and won't flex far enough
for the tire to rub (while riding).

I think the schwinn frame isn't as heavy as it seems. If anyone is
interested, I'll weigh it when i get it from Nik

In the fall section of UNiVERsE, there is a night shot of adam falling
on a crank stall, and the uni snaps back up on the rail. there is no
"carnage" shot of the frame, but that fall bent the bearing hole enough
to ruin that blade.

if for no other reason, there is only one bolt to undo when you want to
change a flat.

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that'd be good if I could get the weight. i want to see how well these
work for myself... i've been looking at a cheapie on ebay that i might
want to toughen up a bit with a new wheelset...

--
abbabibble

Cheers, Mat.
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that is the problem, you won't be able to go splined without metalwork.

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onetrack said:

if for no other reason, there is only one bolt to undo when you want to
change a flat.

The nice thing about the Schwinn design is that you have to undo only
one bolt to change a tyre anyway. If you remove the seat post, the
frame falls apart in two halves, letting the tyre out.

Klaas Bil - Newsgroup Addict
--
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frame strenght dsoent rlly mahter ...

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Of course it does, you've just never ridden a frame weak enough for it
be a problem.

--
kington99

Dave

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kington99 said:

Of course it does, you've just never ridden a frame weak enough for it
be a problem.

Maxisback probably meant to say "Generally, frame strength is not an
issue". Which is true.

Klaas Bil - Newsgroup Addict
--
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