[DVBC] Bike Fit Riddle

[Drew.Knox at bentley.com]

The measurements are most likely accurate. The problem is that they are
not the right measurements for transferring fit from one bike to
another.

Still waiting to hear from the source but it seems unlikely that David
would have set his seat height by measuring from ground to top of saddle
(and that would have been wrong). David, is this true? Did you measure
saddle height from center of the bb, from the center of the pedal
spindle, or from the ground?

After transferring saddle height, the next step should be to copy reach
(yes, measuring from the nose of the saddle) and angular difference
between saddle and handlebar heights to set the handlebar position.
Saddles may be slightly different sizes but they sure won't make the
drop be off by two inches.

My .02
=dk=

-----Original Message-----
From: dvbc-list-bounces at list.dvbc.org
[mailto:dvbc-list-bounces at list.dvbc.org] On Behalf Of Chuck Yeager
Sent: Monday, May 08, 2006 1:38 PM
To: dvbc-list at list.dvbc.org
Subject: [DVBC] Bike Fit Riddle

Bob's analysis should be correct, if the ground to top (bar & saddle)
measurements are the same, the drops must also be the same.  It seems
that some measurement must not be accurate.

Measuring from the nose of the saddle to the bar is not a good indicator
of the overall reach, unless the same saddles are used, as the saddles
may be of a different shape.

Chet

>
>Message: 2
>Date: Sat, 29 Apr 2006 20:41:18 -0400
>From: David <dcunicelli at rcn.com>
>Subject: [DVBC] Bike Fit Riddle?!
>To: bike club <dvbc-list at list.dvbc.org>
>Message-ID: <C0797FEE.2DD3%dcunicelli at rcn.com>
>Content-Type: text/plain; charset="US-ASCII"
>
>Hello all,
>     I've been trying like crazy to fit my bike in as close a manner as

>possible.  I've got all of my measurements and have laid the bikes out 
>accordingly.  however one bike has defied logic and math to give me 
>trouble.
>
>here it is.  on both bike the following measurements are near 
>exact-seat height, bar height as measured to ground, distance from nose

>of seat to bar.
>but the drop from my seat to the top of my bars comes out quite 
>different-2 inches.  the 2 inch difference is telling on my back.  can 
>anyone figure out what i'm missing and how to fix it without radically 
>altering any other measurements?
>
>any help would be greatly appreciated.
>
>david c
>