View Single Post
  #13  
Old September 2nd 19, 03:39 AM posted to rec.bicycles.tech
John B. Slocomb
external usenet poster
 
Posts: 547
Default 50.4 BCD TA vs. VO

On Sun, 1 Sep 2019 18:12:12 -0700 (PDT), Tom Kunich
wrote:

On Friday, August 30, 2019 at 7:49:45 PM UTC-7, AMuzi wrote:
On 8/30/2019 9:07 PM, Don Gillies wrote:
If a vintage crank needs an offset on one side, you can just add the offset to the other side and substitute a symmetric crankset, so a 116 R+5 bottom bracket can be substituted with a 121 symmetric bottom bracket (120 or 122 would work fine.)

- Don Gillies
Palo Alto, CA, USA


Which makes your tread ( aka "Q") wider.
Deal breaker for some riders.

--
Andrew Muzi
www.yellowjersey.org/
Open every day since 1 April, 1971


The iliac width is why the BB50 has become so common. People's legs do not have to spread so wide and the length of the BB shaft is narrower and consequently stiffer. Average hip breadth is 13" or 33 cm. So the narrower the BB the more angularly correct a pedal spacing would be.

Time for Frank to tell us all that I don't know what I'm talking about.


By gorry Tommie! You hit the nail right on the head!

You whip out these hip width measurements like they are carved on
tablets of stone... and perhaps they are. Except that you neglect to
mention that hip width in males is noticible different than in
females. To the extent thjat a female's knee joints are closer
together then her hip joints while a male's knee joints are generally
speaking the same width.

But perhaps you are telling us that women don't ride bicycles? Or the
moon is made of blue chease?

--

Cheers,

John B.
Ads
 

Home - Home - Home - Home - Home