Roman: Thanks. A little follow-up -
intersection of the DS/SS / 415mm is as short - Is this how these builders are measuring?
Is DS/SS the industry standard?
Regards,
Richard Cielec Chicago, Illinois
roman stankus <rstankus@mindspring.com> wrote: Richard,
The intersection of the DS/SS is a reasonable place to measure to - given the weird geometry of a rear dropout slot. Its just a way to measure the thing - you can put your wheel anywhere you want. Its not a conflict as far as I can see. Yes - your measured CS length may be longer than your dimension to the center of your wheel. On my early 80's Colnago, I pulled out the adjusting screws so I could pull the wheel all the way back to increase the wheelbase length to the max possible because the bike rides better that way for me when I ride it on the rollers. (Puts the front wheel over the front drum). I think super short CS's were/are a bad fad. Most of the framebuilders with lots of experience(not me) say 415mm is as short as they would go typically for several functional reasons.
Roman Stankus
Atlanta, Ga
> Greg:
> This chain stay length discussion echoes an inquiry I made months ago on
where to properly positon the rear axle.
> On my bikes, measuring imaginary intersection of seat and chain stays
places axle nearly full back into drop-out effectively rendering most of the
drop-out a waste of metal. And, questioning the purpose of an adjuster
longer than merely several mm's.
>
> I'm hoping some of the frame builders will comment on this.
>
> I remain puzzled on both counts.
>
> Richard Cielec
> Chicago, Illinois
>
> gpvb1@comcast.net wrote:
> Well, you measure it as it would be measured on a drawing, which is what
it was made from. No need to over-think this.
> The only thing that isn't measured center-to-center is the seat tube
length (when describing a frame) (sometimes).
> Think line drawings - where do the tubes' centerlines intersect, and where
is the center line of things like the axles? Measure to those points.
> Greg Parker
> Ann Arbor, MI
>
> Date: Sat, 7 Aug 2004 08:27:01 -0500
> From: "Douglas Morrell"
> To:
> Subject: re:[CR] When did Raleigh International geometry change?
>
> R Cielec wrote:
>
> "So, how does one measure stay length?
>
> To my uneducated point of view, I don't know what the precise end points
would be. For example, on the drop-out end, there's: the depth of the slot
in the stay for the drop-out; the tip stay."
>
> To which Doug replied:
>
> I don't know the precise answer to that in frame builder's jargon, but
> for the purposes of comparison I think all we need is consistency in
> process. I would propose center of BB spindle to rear-most point of drop
> out slot as a measure of "effective" chainstay length.
>
> On my 23.5" International it is 17 5/8", or using 2.54 cm to inch
> conversion, 44.77cm. I would consider it "long" as I have plenty of room
> to mount a frame pump on the backside of the seat tube and still easily
> install the rear wheel.
>
> Doug Morrell
>
> St Louis MO
>
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