MIKE is my name!
Join Date: Mar 2012
Location: finland,baltimore
Posts: 2,846
Bikes: hans lutz, , puch mistral ultima,2x Austro Daimler Smoked chrome Ultima,Austro Daimler Mixte,Austro Daimler 531 mixte, flying arrow,F Moser,
Mentioned: 5 Post(s)
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its the distance between the cogs -that is the issue.
a narrow hub wont fix the problem, re shimming the hub wont fix the problem
this is a junior road bike w/ 24" tubulars
the distance between the BB and rear axle are much shorter increasing the chain twist
my thoughts are
the 5 speed is 25mm wide and works perfect.
the ultra 6 at 27mm did not work because the cogs were too thick(old fashioned) and the chain just did not like the flex at the smallest cog or the biggest cog.
modern chain did not help either
new HG teeth are narrow and if I could build a Ultra HG at 25mm running a modern chain it would be perfect.
Last edited by puchfinnland; 08-29-12 at 01:21 AM.