RE: [CR]Re: Classicrendezvous Digest, Vol 62, Issue 7


Example: Framebuilding:Paint
From: "devotion finesse" <devotion_finesse@hotmail.com>
To: Andrew R Stewart <onetenth@earthlink.net>, <classicrendezvous@bikelist.org>
Subject: RE: [CR]Re: Classicrendezvous Digest, Vol 62, Issue 7
Date: Sat, 2 Feb 2008 19:24:05 -0500
In-Reply-To: <425BBF8CE569427E8F78026CE177B090@AndrewRStewaPC>
References: <MONKEYFOODDCZx4FR0r0000004b@monkeyfood.nt.phred.org>


I recently came across a Nuovo Record equipped bike badged "Cyclery North" locked up to a fence here in Brooklyn. A nice royal blue color with red and cream decals...Only upon closer inspection, it had "Pogliaghi" stamped ont o the stay caps and "PSM" on the seat lug cluster. Yes, I went into all su rrounding business. Yes, I found the owner. No, he would not sell me the b ike.

Matthew Bowne leaving no stone unturned in Brooklyn, New York.

----------------------------------------

> From: onetenth@earthlink.net

> To: classicrendezvous@bikelist.org

> Date: Sat, 2 Feb 2008 19:11:25 -0500

> Subject: [CR]Re: Classicrendezvous Digest, Vol 62, Issue 7

>

> Ken- The primary reason the seat tube has any angle is to allow the rider
a

> certain amount of seat set back (behind a vertical line running through t
he

> bb center). This set back establishes the pedal/knee relationship. Common


> frame design thought has the seat tube angle varying with thigh length.

> Longer thighs "need" more set back equaling a shallower angle.

>

> Another reason why smaller bikes often have a steeper angle (besides the


> thigh length being short) is to lessen toe clip overlap when short top tu
be

> lengths are used. (This goal is also why some small frames have slack hea
d

> angles, pushing the axle further away from the crank).

>

> There is a lot of marketing influence and inertia of tradition in making


> these design choices. In the ideal custom world the rider's dimensions an
d

> needs drive the choices.

>

> An example of how it can be done is in the story of when I was working fo
r

> Cyclery North in Chicago (1985). We were a frame building shop. The

> boss/designer would do the fit and design then hand off the actual build


> work to Tommy (or I). The boss based all his designs on a 60* angle betwe
en

> the down tube and the head tube (lower head angle). To make the more

> important frame dimensions work Tommy and I had to "fudge" this 60* spec.


> When I asked the boss about this he said "All the good handling bikes I'v
e

> ridden use 60*". Sure if you're 5'10" and want no fender clearance!

>

> Lastly why should the length of the stays or size of wheels change how th
e

> body needs to be positioned? I have four self built frames that share the


> main triangle dimensions but differ in the rest, as their use ranges from


> fixed gear track, through Sunday light, commuting to loaded touring.

>

> Andy Stewart

> Raleigh, NC

>

>>

>> Date: Sat, 2 Feb 2008 08:48:50 -0500

>> From: "Kenneth Freeman"

>> To: "'Emily O'Brien'" ,

>>

>> Subject: RE: [CR]Re: Classicrendezvous Digest, Vol 61, Issue 103

>> Message-ID:

>> In-Reply-To:

>> References:

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>>

>> Thinking about frame angles: I have two Italian or Italian style frames
of

>> the early '80s, with the same steep seat tube angle. My 1980 Masi and m
y

>> '82 or '83 Mondonico are both 52/53 cm frames with 75 degree seat tube

>> angles.

>>

>> Is this a convention of the times? Is it a convention that is held toda
y

>> in

>> performance bikes? Is it just luck?

>>

>> The other dimensions, chainstay, top tube, front center, and head angle
,

>> are rather different.

>>

>> Ken Freeman

>> Ann Arbor, MI USA