Posts Tagged ‘frames’


cad overlay bike geometry

August 19th, 2012

I photographed each bike to compare seat and handlebar positions. For fun, I took it a bit further and traced frame center lines.

Note/Disclaimer: the fork rake and trail measurements are not reliable as I did notice some minor distortion. Actually, I doubt any measurement is all that perfect.

I am surprised to find the Panasonic has the steepest seat tube, and the trail is higher than I imagined. Also the Panasonic feels it needs more seat setback; this exercise helped to illustrate that.

The rSogn is very close to spec (aside from fork rake). Not shown is the 65 mm bb drop, which is spot on when measured in AutoCAD.

Categories: Bicycle geometry projects
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Bike / frame specs

August 15th, 2012

Nishiki Professional, circa 1974
seatpost: 26.6 mm (to be confirmed)
steerer: standard 1″

Panasonic Touring, 1978
seatpost: 26.6 mm
steerer: standard 1″

Takara 731, 1977
seatpost: 25.8 mm (to be confirmed)
steerer I.D.: .833″

Rawland rSogn, 2010
seatpost: 27.2 mm
seat collar: 29.8 mm
front derailleur clamp: 28.6 mm

Salsa Ala Carte, 2006 (orange)
seatpost: 27.2 mm
seat collar: 30.6 mm
front derailleur clamp: 28.6 mm, bottom pull, top swing
Link to 2006 Ala Carte specs

Cherubim
seatpost: 26.8 mm
steerer: standard 1″

Other Resources:
Sheldon’s cribsheets

Categories: Bicycles, Bicycles - Useful info
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