Untrue wheel less efficient?

: Okay now that I have a new wheel on order to replace the untrue (bent) one
: on the back of my bike now, would a bent wheel be less efficient than a
true
: wheel?
:
: Ken

Why do you ask a rhetorical question?

Ken said:

Okay now that I have a new wheel on order to replace the untrue (bent) one
on the back of my bike now, would a bent wheel be less efficient than a true
wheel?

Ken

yes. depending on magnitude of course, the small accelerations the bent
wheel imparts dissipate energy.

jim beam said:

Ken said:

Okay now that I have a new wheel on order to replace the untrue (bent)
one
on the back of my bike now, would a bent wheel be less efficient than a
true
wheel?

Ken

yes. depending on magnitude of course, the small accelerations the bent
wheel imparts dissipate energy.

Which, of course, would be completely overshadowed if it was untrue enough
to periodically brush the brake pad(s).

So is a significantly out-of-true wheel truly untrue?

Austin (sorry, I had to)
--
I'm pedaling as fast as I durn well please!
There are no X characters in my address

Ken said:

Okay now that I have a new wheel on order to replace the untrue (bent) one
on the back of my bike now, would a bent wheel be less efficient than a true
wheel?

I doubt you'll ride much faster with a true wheel, but the brakes will
certainly work better.

Ride your bike at your usual cruising speed on a flat and level road.
Stop pedaling. While coasting, sense the amount of side to side and up
and down wobble, which is of course the result of the out-of-true
wheel. Then with the bike stationary while sitting on the bike with
feet on the pedals have someone manually jostle it a bit to approximate
the feel you got from the untrue wheel when moving. Your friend was
expending energy but not propelling the bike forward. That's the energy
you are wasting with an untrue wheel.
Traction on cornering should be more reliable as well with a true
wheel, when you approach the limit of traction.

Quoted message said:

Ride your bike at your usual cruising speed on a flat and level road.
Stop pedaling. While coasting, sense the amount of side to side and up
and down wobble, which is of course the result of the out-of-true
wheel. Then with the bike stationary while sitting on the bike with
feet on the pedals have someone manually jostle it a bit to approximate
the feel you got from the untrue wheel when moving. Your friend was
expending energy but not propelling the bike forward. That's the energy
you are wasting with an untrue wheel.

Yikes!
Not even close.

In article <[email hidden]>, Ken says...

Quoted message said:

Okay now that I have a new wheel on order to replace the untrue (bent) one
on the back of my bike now, would a bent wheel be less efficient than a true
wheel?

Ken

In theory yes but like a lot of other things discussed about bicycles there are
two possibilities, the effect is significant or it is lost in the noise. I'm
guessing noise.

Ed said:

In article <[email hidden]>, Ken says...

Quoted message said:

Okay now that I have a new wheel on order to replace the untrue (bent) one
on the back of my bike now, would a bent wheel be less efficient than a true
wheel?

Quoted message said:

In theory yes but like a lot of other things discussed about bicycles there are
two possibilities, the effect is significant or it is lost in the noise. I'm
guessing noise.

Maybe on typical road bikes, but a 1/3speed with steel, 25 mm wide rims,
28" x 1 3/8x1 5/8 tires, drum brakes, and very wide stays to accomodate
fenders can have a good centimeter-each-way excursion without rubbing, and
that sure as hell isn't lost in the noise. A millimeter each way, on the
other hand...

Jasper