Re: [ihc] RPM, Gearing formula needed

["Ed Sohm" <idaemes@xxxxxxxxxx>]

Yep, Tom,  agreed.  All ballpark, including mine. I didn't mean to put words
into your mouth.  I hope my e-mail didn't sound wrong.  I read it over a
couple times, but then I knew how I wanted it to sound.

Bill and I discussed his formula a long time ago on TT.  It was so long ago
('98?) that I don't remember the outcome.  Bill had a reason for the 6%, I
don't remember what it was.  Hopefully he will chime in.  We must have
agreed to disagree, because his calculator seems to be how I remember it and
I still do mine the same.  I just wanted to make sure Rocky knew what he was
getting.  Informed decision.

You and I do seem to agree that a tire with a 102" circumference will travel
102" each revolution.  Yes?  Doesn't matter if it has 5 psi and is squatting
down with a 12 inch radius or at 35 psi and  a 16 inch radius.  As long as
it is still round anyway.  If it is flat and ka-thwumping or wrapped around
a rock on the trail, that would be different.

Ed



----- Original Message ----- 
From: <tsm1@domain.elided>
To: "Ed Sohm" <idaemes@domain.elided>
Cc: "ROCKY LEAR" <rockylear@domain.elided>; <ihc-digest@domain.elided>
Sent: Tuesday, September 09, 2003 11:03 AM
Subject: Re: [ihc] RPM, Gearing formula needed


> >   Lets compare the calculators listed.
> >
> > http://www.tmcom.com/~tsm1/scout/faq/ScoutRatios.html
> > says 33" tires, 2279 rpms, 3.73 r&ps = 60mph
> >
> > Different answers because Tom,  Mark, and Bob all assumed that a tire is
> > exactly the size it says it is, Bill assumed that the tire is 6% shorter
>
> OR, you could say, I assume that you've measured your tire, and it's 31".
> :D  Could mean you have 32x12.50s, 33x9.50, 33x12.50, 305/75-16.. ;)
>
> It's all for ball-parking anyways. :)