Performance calculator excel
On-line trail calculator
Rake and trail spreadsheet
Foilsim - Basic Aerodnamics
software - freeware
plots a drawing of a mitered angle on tubing.
mitering program by Giles Puckett produced Dec 1998. And the text file to accompany it.
(Probably the same as the one above)
Ackermann steering design
Spreadsheet program for trikes by Peter Eland
The Paterek 2.0
Framebuilders' Design and Plotter Software
Java programs to make frame design of standard bikes quick and
easy. bikeCAD, tandemCAD,
- Excellent Drive train calculator,
which calculates gear inches and actual speed.Incl
Schlumpf mountain Drive and intermediate drives.
- Gear calculator for
Windows (software by Rod Heilfron)
- Gear calculator for
Amiga, IBM (software by Wayne Clement)
- Gear inches calculator,
in MS Windows executable format (software by Sean
gear program (software by Rod Heilfron)
Gear Ratio Calculator for Win 95 (software by Pewter
- Gear Ratio Program
by Lindsay Steele
- Date: Fri,
14 Jul 2000
From: alex wetmore
Subject: RE: [hpv] Online calculators?
List-Id: Human Powered Vehicles Mailing List <hpv.ihpva.org>
On Thu, 13 Jul 2000, Shaw, Byers Jr.
wrote: I wanted to order it with 11-34 and 62 while he
insisted 12-34 and 60 would give me plenty of gear inches.
Of course, I had measured the actual diameter of the
wheel and tire (Primo Comet 1 3/8) and obtained 18.5
inches. The 60-12 gear combo he claimed yielded 100
inches [ > (60/12)*20 ], while I insisted it gave 92.5",
an unacceptably low set up. Your spreadsheet proves my
point, viz. that on the road, I was spinning out at about
30-33 mph (your chart shows 120 rpm at 33 mph).
This is a very common mistake, even
with larger wheels. A lot of people assume that a
26" mtb wheel with 1" slicks is still 26"
(or close enough when doing gear inch calculations) when
it is really closer to 24".
I usually use 24.5" as the wheelsize for MTB wheels
with slicks, and 18.5" for BMX (406) rims with
slicks. The true size varies a little from here,
but these are much better estimates than 26" and 20".
One simple formula that gets close is: (rim diameter + (2
* tire diameter)) / 25.4
So (406 + (2 * 37)) / 25.4 = 18.9
(that is for the Primo Comet).
The true measurement is often a little less, but this is
Thursday, 29 January 2009