Durability Of Velocity Aerohead Rims In 20/24 Hole Drillings.

In article e14c242c-91b5-4f71-bd25-
,
says...
On Nov 9, 10:28*am, DirtRoadie wrote:
On Nov 8, 4:12*pm, James wrote:



On Nov 9, 9:59*am, DirtRoadie wrote:

On Nov 8, 3:45*pm, "Barry" wrote:

I though that Bicycling Science would have something about the variation of
power during the pedal stroke, and how peak instantaneous power depends on
cadence, but I couldn't find anything relevant.
Peak = double the average is a good starting point.

Independent of cadence?

Also if you do the
calculations, you'll find that heavy and strong riders on steep grades
in a low gear are the "worst case" scenario for rear wheel torque.

I agree with heavy, strong, and steep, but not with the low gear part. *For a
given power, slope, and climbing speed, why would low gear mean higher rear
wheel torque?

Lower gear would mean more ability to apply greater instantaneous
torque even if speed is relatively constant. The same thing is readily
seen when climbing with limited traction on a mountain bike. Use of a
low gear makes it MUCH easier/more likely to break the wheel loose.

Agreed.

In fact that's one reason why folks on single speeds find themselves
able to do climbs they could not do on multi-geared bikes.

Keh? *Can you explain this a bit more please?

In more simple terms a single speed is likely to have gear ratio quite
a bit higher than the lowest gears on a typical mountain bike and the
rider is forced to use that higher ratio ALL the time. The higher gear
ratio lessens the likelihood of breaking the rear wheel free on
traction-poor surfaces.
It's a technique most mountain bikers discover eventually.

Ah, so improved technique by forced learning.

It helps on a road bike to use a slightly bigger gear, on rough
surfaces (cobbles, etc.) and wet roads.

And those of us with knees too stuffed to ride on single-speeds learn a
sort of slightly bent-kneed, slightly crouching, slightly over-
pronounced 'ankling' sort of pedalling motion to avoid breaking traction
in our granny-gear when climbing step gravelly sections.

It is hard (for me at leas - as you can read above) to describe the
pedalling motion, but it is very different to the dynamics of my
pedalling style when I want to wring out the last ounce of hill-climbing
on my road bike.

Mike