Sakae/Ringyo (SR) Super Custom-5LA (144mm BCD)
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Category:  Cranksets
Name:  Sakae/Ringyo (SR) Super Custom-5LA (144mm BCD)
Brand:  Sakae/Ringyo (SR)
Model:  CT-5LA
Years:  Early 1980's - Late 1980's
Country:  Japan
Weight:  669.5 grams (avg)
View Weight List
Added By: JFischer on 08/31/12
Updated By: Da.Rav on 05/02/17
Additional Photos - click for full size
Sakae/Ringyo (SR) Super Custom-5LA (144mm BCDSakae/Ringyo (SR) Super Custom-5LA (144mm BCDSakae/Ringyo (SR) Super Custom-5LA (144mm BCDSakae/Ringyo (SR) Super Custom-5LA (144mm BCDSakae/Ringyo (SR) Super Custom-5LA (144mm BCDSakae/Ringyo (SR) Super Custom-5LA (144mm BCDSakae/Ringyo (SR) Super Custom-5LA (144mm BCD
Chainring CountDoubleBCD 144mm
BB StyleSquare Taper (JIS)Pedal Threads14mm x 1.25mm (French);
9/16" x 20 (English)
BB Length 145,5mm incl. threads (BB SR SC(-IS) 5SS)Flutes None
Lengths 165; 170Arm/Spider MaterialLight Alloy
Front MarkingsSUPER CUSTOMBack Markings[Length], [Production Code], JAPAN, SR, JIS stamp, [Number]
Extractor Threading 22x1mm (Standard)  
General Information
According to the SR catalaogue P-7 from Sept. 1982:
Super Custom CT-5LA, melt-forged high strength, light alloy, one piece crank and arm, aerodynamic style, cold rolled super Duraluminum chainrings, chain line same as AEROX
"Interchangeable with the (AE-5LA or) CAMPAGNOLO"...!? Meaning JIS=Campa=ISO???

Dismounted from a 1984 Rauler roadbike with a Sakae/Ringyo (SR) SC(-IS) 5SS (70mm) bottom bracket with a length of 145,5mm incl. threads; (imo the genuine "OEM" combination)
-> so the chain line for a double crankset (like this CT-5LA) is 46,5mm

The weight (655g) shown in the P-7 catalogue is imo a typoand should be 685g, because the SL (SuperLight) version of this crankset with drilled chainrings should be lighter and not heavier by 10g (total 675g);
In addition a total weight of 685g would almost meet exactly the actual measured weight of 684g.
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Additional Resources
Resources:Reference & ChartsCatalogsGear Calculator
Component VariationsView Detailed List  Manage Variations
Variations of Component exist (Component is 1 of 3)BrandGroup
Sakae/Ringyo (SR) Super Custom (110mm BCD)Sakae/Ringyo (SR)
Sakae/Ringyo (SR) Super Custom (86mm BCD)Sakae/Ringyo (SR)
Brand Information(click to expand)
Date of Manufacturing / Production Code for SR seatposts (at least for the 80's):
The date of prodcution of SR (Laprade) seatposts is shown around the min.insert line as follows:
"letter"-"double digit number", e.g. F-81 oder L-81, while the letter should be the month and the number will be the year of production.
So F-81 seems to be June 1981 while L-81 would indicate December 1981.
(in-line with the code 1 examples on

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WeightSourceNotesAdded By
684 GramsActualfor standard 170&52/42 Tombo
655 GramsSpecfor standard 170&52/42 -> SR Catalogue P-7 (1982) Tombo
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