Re: [CR]Re: measuring stay lengths

(Example: Framebuilders:Alberto Masi)

Date: Wed, 11 Aug 2004 17:10:10 -0400
Subject: Re: [CR]Re: measuring stay lengths
From: "Richard M Sachs" <>

"The universe is expanding." Alvy Singer

one guy can't tell us if he's designing, building, or measuring a bicycle, and another guy no longer does any of it. i'm now in the red zone. not the red and white zone; the red zone. what exactly do you want me to say, measure, or concede to??! e-RICHIE chester, ct

On Wed, 11 Aug 2004 14:02:04 -0700 (PDT) Joe Starck <> writes:
> -- Richard M Sachs <> wrote:
> "my way of measuring (measuring along the centerline
> of the frame's central plane) yields the half cm diff
> that you note, not the 1 ephgrave mm that you not
> after the fact. "
> Richard,
> Let's consider a 42 cm chainstay length and 8 cm drop.
> Side view of the frame:
> The designated chainstay length is 42 cm measured from
> center of bottom bracket to center of rear axle,
> PARALLEL TO THE GROUND, and the rear axle position is
> achieved by default on a vertical dropout, whereas
> with the use of a horizontal, it's anywhere the
> builder prescribes, in my case, it was always to the
> midway position that the axle could be positioned in
> the dropout, using primarily 1010B or shorter
> horizontals (Is this within Don's 6-9 mm axle/hanger
> edict?)
> Now then, this above set-up on a frame jig means that
> the measurement along the somewhat centerline of the
> chainstay, I say "somewhat because the dropout center
> is 'neath it, measured from center of BB to center of
> axle position, should be set at a bit less than 42.7
> mm, being the hypotenuse of the 42 cm leg of the
> triangle.
> So, say 6 mm difference there.
> Now then,
> Top view of the frame:
> Same 42 mm length, and yet the hypotenuse leg is a wee
> bit shorter, by about one millimeter. And when
> measured from outside of crank bolt to outside of
> skewer the differnce is less, as the measurement is
> now close to being parallel to the plane of the main
> triangle. But who cares about the top view, right? It
> was this dimension I was thinking about when I stated
> the one ducky difference, and so I yes, I contradicted
> myself , but in err' only. My bad.
> Still, I would think that if a Sachs owner (Is Richard
> Cielec a Sachs owner?) were to measure his chainstay
> length from outside of crank bolt to outside of
> skewer, center to center, and came up with 42.5 on an
> 8 cm or so BB-drop-designed frame of yours, subtracted
> 5mm netting 42 cm, he has indeed measured his
> chainstay length quite nicely and precisely.
> Starck,
> Joe
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