Re: [CR]Table for Seat Tube Angle Calculation

(Example: Framebuilders:Chris Pauley)

From: "Questor" <questor@cinci.rr.com>
To: <LouDeeter@aol.com>
Cc: "classicrendezvous" <classicrendezvous@bikelist.org>
References: <14c.732da10.297363fd@aol.com>
Subject: Re: [CR]Table for Seat Tube Angle Calculation
Date: Sun, 13 Jan 2002 17:50:58 -0500


Hi Lou,

Track, Criterium, and Road frames use different angles and frame tube lengths... what frame type does the table below represent since I don'd build frames and know what they are?

Thanks, Steve


----- Original Message -----
From: LouDeeter@aol.com
To: classicrendezvous@bikelist.org
Sent: Sunday, January 13, 2002 5:28 PM
Subject: [CR]Table for Seat Tube Angle Calculation



> This is also from the Used Bike Buyers Guide. Hope it comes out on your
> email with all the columns. Email me if you have questions. Lou Deeter,
> Orlando FL
>
> SEAT TUBE ANGLE
>
> Seat tube angle is the angle between the seat tube and top tube. Setback
> is the distance the seat tube is behind the bottom bracket, measured along
> the top tube. Setback will influence weight distribution, bike fit, and
> handling.
> With a normal frame, where the top tube is parallel to the ground,
> setback can be determined by dropping a string with a weight from the top
> tube so that it intersects the center of the bottom bracket. Measure along
> the top tube from the string to the center of the seat tube.
> To use the table, first measure the setback and seat tube, center to
> center, in centimeters. Find your frame size (seat tube measurement) on the
> left, then follow that line across into the table until you find the closest
> setback that matches your measurement. Now, go to the top and you will find
> the seat tube angle. If the setback measurement is between the numbers in
> the table, then the seat tube angle will fall between the two angles at the
> top.
> Record this measurement for a frame that fits really well. Then, in the
> future, when you shop for a frame, try to find one with a similar setback,
> given a specific frame size.
>
> SEAT TUBE ANGLE (DEGREES)
> 70 71 72 73 74 75
> 76 77
> S 48 16.4 15.6 14.8 14.0 13.2 12.4 11.6 10.8
> E 49 16.8 16.0 15.1 14.3 13.5 12.7 11.9 11.0
> A 50 17.1 16.3 15.5 14.6 13.8 12.9 12.1 11.2
> T 51 17.4 16.6 15.8 14.9 14.1 13.2 12.3 11.5
> 52 17.8 16.9 16.1 15.2 14.3 13.5 12.6 11.7
> T 53 18.1 17.3 16.4 15.5 14.6 13.7 12.8 11.9
> U 54 18.5 17.6 16.7 15.8 14.9 14.0 13.1 12.1
> B 55 18.8 17.9 17.0 16.1 15.2 14.2 13.3 12.4
> E 56 19.2 18.2 17.3 16.4 15.4 14.5 13.5 12.6
> 57 19.5 18.6 17.6 16.7 15.7 14.8 13.8 12.8
> I 58 19.8 18.9 17.9 17.0 16.0 15.0 14.0 13.0
> N 59 20.2 19.2 18.2 17.2 16.3 15.3 14.3 13.3
> 60 20.5 19.5 18.5 17.5 16.5 15.5 14.5 13.5
> C 61 20.9 19.9 18.9 17.8 16.8 15.8 14.8 13.7
> M 62 21.2 20.2 19.2 18.1 17.1 16.0 15.0 13.9
> 63 21.5 20.5 19.5 18.4 17.4 16.3 15.2 14.2
> SETBACK IN CENTIMETERS