Re: [CR]Calculating Trail

From: "Olof Stroh" <olof@stroh.nu>
To: "Roman Stankus" <rstankus@mindspring.com>, "'Mark Bulgier'" <Mark@bulgier.net>, "'Rick bernardi'" <rixtir@yahoo.com>, <classicrendezvous@bikelist.org>
References: <E1FF8oY-0002Bu-EH@smtpauth07.mail.atl.earthlink.net>
Subject: Re: [CR]Calculating Trail
Date: Fri, 3 Mar 2006 15:13:23 +0100

To all

Nicest site I know of is this:

http://kogswell.com/trail.php

Olof Stroh Uppsala Sweden

> This is a great site that makes it super easy. Go to
>
> http://www.kreuzotter.de/english/elenk.htm
>
> Roman Stankus
> Atlanta, Ga
   Subject: RE: [CR]Calculating Trail
>
>
>
> The mysterious "Rick" of Anytown, USA asked:
>
> > Does anybody know how to calculate trail?
>
> Not sure if it's really on topic -- but what the heck, they did
> calculate trail back then...
>
> Anvil Bikeworks has an Excel spreadsheet you can download at
> http://anvilbikes.com/story.php?module=calculators
>
> Or just whip out your trig tables and calculate it yourself with:
> Trail = W/tan(H)-R/sin(H)
> Where W = wheel radius (hub axle center to the ground), H = Head
> Tube
> Angle, and R = rake
>
> Wheel radius should ideally be measured with your weight on the bike,
> thus it varies with tire pressure - but nobody needs to know their trail
> that accurately. It's just not that sensitive.
>
> Mark Bulgier
> Seattle WA USA