Pre-CPSC v. Post-CPSC Cranks
12-29-15 | 10:43 PM
#1
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From: Tacoma, WA
Bikes: 1962 Schwinn Paramount P12, 1971 Schwinn Paramount P13-9
Pre-CPSC v. Post-CPSC Cranks
Other than requiring different spindle lengths, is there a dimensional difference between Campy Record cranks pre-CPSC and post-CPSC?
12-29-15 | 11:24 PM
#2
The later cranks are "flatter on the back side", part of the reason for the longer spindle necessary with the later arms, there is more dimension between the outer chainring face and the back side of the drive side arm, to allow the revised derailleur cage with the extra dimension of the lip to clear.
The differences are small but notable.
I have used a later derailleur with an early crank arm but you have to set it up very carefully.
The earlier cranks will have a slightly smaller "Q" factor.
12-30-15 | 08:23 AM
#3
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From: Baltimore MD
Bikes: '72 Motobecane Grand Record, '72 Gitane tandem, '72 Raleigh Super Course, '73 Raleigh Gran Sport, '73 Colnago Super, '76 Fiorelli Coppi, '78 Raleigh SBDU Team Pro, '78 Trek 930, '81 Holdsworth Special 650B, '86 Masi GC, ’94 Bridgestone RB-T
I assume the non-drive side arms are identical pre- and post?
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