Join Date: Jul 2000
Bikes: 1959 Capo; 1980 Peugeot PKN-10; 1981 Bianchi; 1988 Schwinn KOM-10;
Mentioned: 6 Post(s)
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Quoted: 141 Post(s)
Your cranks are not seating all the way down onto your spindle. This is a common problem with some of the Shimano sealed units, such as the UN-72. (Although there is only one standard taper angle for square-shank crank spindles -- 2 degrees, if I recall correctly -- there are at least two standards for the ultimate diameter of the tapered shaft.) If your spindle is too fat for your cranks, the latter will seat only halfway or so.
I try to set up triples so that the grannie ring just barely clears the chainstay under maximum load/flex.
"Early to bed, early to rise. Work like hell, and advertise." -- George Stahlman
Capo [dschaw'-poe]: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger, S/N 42624
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1981 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069