Math question (Trainer)

Hell and High Water said:

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

Quoted message said:

Quoted message said:

Nice troll.

??

Not sure I get that one...

Well, why bother mentioning that the trainer "is set to the middle of
three resistance settings" if you're not interested in factoring in the
power? Why even bother mentioning the trainer at all? The question
could simply have been "with chainring size x, sprocket size y, and
wheel/tyre size z, what is my road speed at a cadence of 100?"

--
Dave...

Quoting Hell and High Water <[email hidden]>:

Quoted message said:

On a side note, I went out for a ride this morning, dropped it into that
exact gear, 53x14, pedaled with the same tune in my head, Stones 'Beast
of Burden', looked down at the speedo and

ran into a lamp-post? :-)

[Seriously - above about 45mph I prefer to ask the stoker how fast we are
going.]
--
David Damerell <[email hidden]> flcl?
Today is First Teleute, October.

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

Quoted message said:

Hell and High Water said:

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

Quoted message said:

Quoted message said:

Nice troll.

??

Not sure I get that one...

Well, why bother mentioning that the trainer "is set to the middle of
three resistance settings" if you're not interested in factoring in the
power? Why even bother mentioning the trainer at all? The question
could simply have been "with chainring size x, sprocket size y, and
wheel/tyre size z, what is my road speed at a cadence of 100?"

OK. Next time I'll phrase it that way....

-Bob

Art Harris said:

Jasper Janssen said:

tells you the answer is 47.67.

That's 47.67 km/hour. Or about 29.8 mph.

Yeah, he asked "how fast would I be going", not "What'd be my speed in
obsolete nonstandard units". The meters pretty much automatically come out
when you're speccing wheel size in mm.

Quoted message said:

The 0.00297 is the fudge factor that brings all the units into line.

That's fine, of course, but it doesn't help you to understand *why*, nor
is it (to me) terribly easy to remember -- I'd rather write it out from
scratch.

Jasper

Hell and High Water said:

I'm on my trainer and I'm pedaling exactly 100 RPM.

Front chainring is 53

Rear cog is 14

Tires are 700 x 23

Trainer is set to the middle of three resistance settings

If I was doing this on the road, how fast would I be travelling?

(seriously....this isn't a trick question. I just don't know how to
figure it out...)

THANKS!

-Bob

Put your trainer on the road. Get on it and start pedaling. How fast
do YOU think you'll go?

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

Quoted message said:

Hell and High Water said:

I'm on my trainer and I'm pedaling exactly 100 RPM.

Front chainring is 53

Rear cog is 14

Tires are 700 x 23

Trainer is set to the middle of three resistance settings

If I was doing this on the road, how fast would I be travelling?

(seriously....this isn't a trick question. I just don't know how to
figure it out...)

THANKS!

-Bob

Put your trainer on the road. Get on it and start pedaling. How fast
do YOU think you'll go?

OK, so it *IS* a trick question!!

;-)

-Bob