I was moved to ask the question because I was surprised to see how much of the taper of the Phil spindle was showing on the Mercian in this photo
http://www.flickr.com/
But, I'm an amateur, and the seller is a professional. I also wondered, appropriate to this goup-- as against bikes,rec.tech-- whether an aesthetic held certain clearances, greater than the minimum necessary, to be appropriate.
On chainline, a simple idea, I understand minimizing average error and the possibility with older chains that certain gear combinations would be impossible without due concern for lateral chainrings location. I don't understand the concern what with today's flexible chains. But, that's a technical issue, too.
said Harry Travis Washington, DC USA
, stirred by:
"David Snyder" <dddd@pacbell.net>'s message of:
Saturday 14 Jun 08 at 08:10 AM,
On: Re: [CR]eBay Listing; Mercian Strada Speciale Bicycle, 60 cm
c-top, 2001 w/Campy NR/SR
[echoed below, in part<=1]
-oOo-
>Aside from needing but a few millimeters of clearance between the
>pedal-end of the cranks and the chainstays, the actual space there can
>vary quite a bit depending on the frame's design, and other
>considerations to spindle length usually prevail.
>Spindle length (chosen from what's actually available) should thus be
>determined by chainring clearance (a couple of mm minimally),
>chainline, arm clearance and symmetry of pedals about the bb.
>Note that chainring size can affect clearance at the chainstay,
>something to consider if you'll likely be changing to a larger inner
>chainring. I eschew measuring chainline directly in favor of sighting
>down the sides of the large chainring back to the freewheel.
>David Snyder
>Auburn, CA usa
>>
>> A photo of the crank on the BB caught my attention, leading me to a
>> general question. How much clearance between left crank arm and
>> chainstay do you expect when you select a bottom bracket, and how much
>> clearance to you allow on the drive side for chainwheel and crankarm?
>>
>> Harry Travis
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