Rear Derailleur - 01

REAR DERAILLEUR:
Simplex SLJ - double spring articulated design - Clear anodized forged aluminum alloy upper and lower housings - Clear anodized forged aluminum alloy pivot arms - pre 1980 Gold colored foil badge with stylized "Simplex" logo in Black on outer pivot arm - pre 1979 chrome plated steel chamfered pivot bolts marked "SIMPLEX" and "L. JUY" - post 1976 C.P.S.C. compliant "round head" cable anchor bolt - post 1977 "extended tube" style pivoting cable guide - aluminum alloy pulley cage plates without optional chain guide - aluminum alloy pulley axles - ten tooth bushing style nylon plastic pulley wheels - 14 to 24 tooth (...with optional chain guide) or 26 tooth (...without chain guide) freewheel capacity / 36 to 52 tooth chain ring capacity / 26 tooth (...with optional chain guide) or 28 tooth (...without chain guide) maximum total capacity - model SLJ (Super Lucien Juy) 5000 CP/SP ... [The first of the highly esteemed Simplex SLJ series rear derailleurs debuted in 1972 as the SLJ AR 615 which was subsequently superseded by the only slightly different SLJ 5000 coincident to model year 1975 (...rather than having a fixed cable guide cast into the top of its upper housing, said guide was now integrated into an extension of the inner upper pivot pin). Depending upon the specifics of the chain rings and freewheel cogs selected on the corresponding build sheet, a custom made PY-10 CP for 1978 would have normally come equipped with either a Simplex SLJ 5000 CP/SP short cage or SLJ 5000 T/SP rear derailleur having a similarly short but offset cage and consequently higher chain wrap capacity (...24 or 26 tooth maximum for the former versus 30 tooth for the latter - the true long cage SLJ 5000 GT/SP also having an offset pulley cage assembly had an even greater overall capacity at 39 teeth, but it was never made available on the PY-10 CP model to the best of my knowledge). For even more "lightness of being", one could optionally specify a Delrin bodied LJ 4000 rear derailleur (...again, provisioned as either a CP/SP or T/SP version depending upon the specifics of gearing requested) like those which were used on genuine Peugeot-Esso-Michelin team bikes at the time (...Peugeot PY-10 team bikes were generally fitted with a Gold anodized version of the SLJ AR 615 commencing May of 1974, a similarly Gold anodized replacement SLJ 5000 CP/SP throughout the 1975 season, followed by a Clear anodized version of the SLJ 5000 CP/SP for 1976, then a stock Delrin based LJ 4000 CP/SP for 1977 and 1978, then back to aluminum with the newly introduced SLJ 5500 CP/SP for 1979 through mid year 1981, and finally a special "team issue" only highly modified and ultra lightweight version of the Delrin LJ 4000 CP/SP from mid 1981 onward). While Simplex may have produced the SLJ 5000 from 1975 through 1978, the particulars of the one selected for use here would indicate that it is the third and final generation of same having a post 1977 "extended tube" style pivoting cable guide in common with its SLJ 5500 successor that would be introduced in 1979 and manufactured through at least 1984 (...first edition versions of the SLJ 5000 had a plastic "button head" guide around which the rear derailleur cable wrapped whereas second editions incorporated a simple chrome plated "cylindrical" type of pivoting cable guide).]