Shimano CR-BP10 & CR-BP20, Biopace
Main Photo
Category:  Chainrings
Name:  Shimano CR-BP10 & CR-BP20, Biopace
Brand:  Shimano
Model:  CR-BP10 & CR-BP20
Years:  1980's
Country:  Japan
Weight:  81 grams
Added By: redxj on 10/31/07
Updated By: JFischer on 01/14/10
Additional Photos - click for full size
Shimano CR-BP10 & CR-BP20, BiopaceShimano CR-BP10 & CR-BP20, BiopaceShimano CR-BP10 & CR-BP20, BiopaceShimano CR-BP10 & CR-BP20, Biopace
Identifying MarksShimano Biopace and tooth countBCD 130mm
Tooth Count RangeRing PositionLarge; Small
Chain PitchChain Width
General Information
Nicer Shimano Biopace rings that were on a Shimano 600 tri color crankset.  Chainrings are 42t and 52t and date from 1987. 81grams for 52t ring and 50g for 42t ring.
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Additional Resources
Resources:Reference & ChartsCatalogs
Brand Information(click to expand)

Shimano Model Number Prefix List:

BB Bottom Bracket BL Brake Lever BR BRake
CB Coaster Brake CJ Cassette Joint CN ChaiN
CP Chain Protecto CR Chain Ring CS Cassette Sprockets
DF chain DeFlector DH Dynamo Hub FC Front Crank
FD Front Derailleur FE Fork Ends FH FreeHub
FS Front Suspension HB HuB HD HanDle bar
HP Head Parts (Head Set) HS Handle Stem IF Inter-3 Freehub
LP LamP MF Multi Freewheel PD PeDal
RD Rear Derailleur RH Rollerbrake Hub RM RiM
RR ReflectoRs RS Rear Suspension SB Shift Brake lever (Nexus, ?)
SC Speed Calculator (cycle computer) SF Single Freewheel Freilaufritzel SG Speed chanGe hub
SH SHoes SL Shift Lever Schalthebel SM SMall parts
SP Seat Post SQ Seat Quick release SS Single Sprocket
TL TooL WH WHeel ST Shift Brake Lever (STI, Rapid Fire, etc)
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