Sakae/Ringyo (SR) Custom-P6 with SDC
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Category:  Seat Posts
Name:  Sakae/Ringyo (SR) Custom-P6 with SDC
Brand:  Sakae/Ringyo (SR)
Primary Group:  Custom
Model:  CT-P6C
Years:  1970's - 1980's
Country:  Japan
Weight:  220 grams (avg)
View Weight List
Added By: JFischer on 12/07/09
Updated By: Tombo on 05/13/16
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Sakae/Ringyo (SR) Custom-P6 with SDCSakae/Ringyo (SR) Custom-P6 with SDC
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MarkingsSRMaterialLight Alloy
Shaft DesignFlutedSaddle Attachment StyleSaddle clamp
Saddle Attachment Bolt Size(s)10mm wrenchOverall Length 180mm
Max Height Setback 
General Information
Example is 26.8mm, with integrated item SDC (saddle clamp), which is made of steel at a weight of 100g.
weight for CT-P6 w/o clamp: 170g

Available diameter are: 25.4 & from 25.8 to 26.8 in 0.2mm increments.
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Additional Resources
Resources:Reference & ChartsCatalogs
Component Groups
Primary Group NameBrandQuick InfoBrowse Group Components
CustomSakae/Ringyo (SR)View 7 Components
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
170 GramsSpec JFischer
270 GramsSpecWITH clamp -> SR Catalogue P-7 (1982) Tombo
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