Angel Garcia asked: "Still learning. I have two STRADA spiders with 170 cranks, one is early 70s (C in diamond) and the other is newer (9 in diamond). The newer one slides further onto the axle causing the small chainring to hit the chainstay; the older spider doesn't go as far and the small chainring clears. Are there differences or something wrong with the later one I have?"
Angel, The tapers were the same, but if one of the previous mechanics had a miscalabrated arm, welll... then the taper is malformed (i.e. over tightened; NOT because of the use of grease on the tapers contrary to what certain manufacturers would like you to believe. Period. NON-debatable). Look inside after cleaning all the afterbirth off and see what's go'n on. Iffin things aren't nice and square, then she 's shot. But, If all else fails, use a triple axle or put a spacer between the fixed cup and b.b. Or shave the shoulders where the inner ring sits and now she's a "five speed" crank. COOL! You need about 1/8 inch min. clearance between the inner ring and stay to be kosher as everything will bend under stress. IMHO
Have fun,
John T.Pergolizzi
Brooklyn, New York