Hope this is enough info
Taken from bmxmuseum.
1981 700 MX-II 4130 frame and down tube decals, Vbars and Redline stem, Suntour VX alloy 3 piece cranks.
1981 600 MX-II 4130 frame and down tube decals, Vbars and Redline stem. Only difference from the 700 is the 1 piece
cranks.
1981 520 MX-II 4130 frame and down tube decals, Vbars but cheapo slant stem and Coaster brake Tuff Wheels.
All three came in your choice of Red, White or Blue.
1981
1981 700 MX-II 4130 frame and down tube decals, Vbars and Redline stem. Sugino Maxy-Cross alloy cranks, Suntour seat clamp and hubs, National skinwalls and KKT alloy pedals.
1981 600 MX-II 4130 frame and down tube decals, same as 700 but came with Sugino 4130 1 piece cranks and KKT steel pedals.
1981 520 unknown specs.
All three came in only Blue, Red, black and white. Chrome would come to the lineup in spring 1981.
Late 81/ 82
The new bikes appear in the Oct. 81 issue of BMXA. Since the advertisemnt had to be shot and submitted before print deadline it probably means the bikes were out at the end of summer 81.
They feature the long huge Redline logo in red with white or black trim. As in the earlier years no decal identifying the bikes as 600 or 700 etc is on the bike yet. The new blocky RL logo is on the seat mast sides and headtube.
81/82 PL-20 Carrera uses a Proline frame, flight cranks and still using Vbars.
Available only in Chrome at first with red or blue parts packages.
81/82 700 Now using a first generation MX-III frame which is really a MX-II. Sugino Maxy-Cross cranks. Everything else same for 600.
81/82 600 Now using a first generation MX-III frame which is really a MX-II. 4130 1 piece cranks.
Both available in Chrome, Red, White, Blue or Black.
MX-II vs. Series-III
Early MX-III were the designation for complete MX-IIs from Japan. The first MX-III frames confused people so Redline also called them Series 3, ST (as in ST-20), Series Three etc.
Late 1982 the first Series-III based bikes rolled out the 600a and 700. Here is how to tell if you have a MX-II or Series-III based frame. Bottom Bracket height (center of BB to ground) MX-II, 11 3/8" . MX-III, 10 3/4" Remember wear and tear on the tires and tire design will affect the BB height slighty.
MX-II Top Tube (TT) is 18"
MX-III Top Tube (TT) is 18 3/4"
MX-II weighs @ 4 lbs 8 ounces
Series-III weighs @ 4 lbs 1 ounce (Dont forget to weigh clean with no headset or BB cups in.)
Series-III have larger then normal drilled out holes on the BB (4 holes) and HT (2 holes), which are covered up by the main tubes.
1983
'83 versions of the MX-III bikes were set to arrive in showrooms, October 1982.
Was the first year of the Redline MX-III. Well sorta. Till then all MX 3 series used a MX2 frame according to an interview by Len Weed from BMX Action Dec. 82. Linn Kastan stated in 1983 Redline debuted its first real MX-III. It came as a complete bike Models 700 and 600a and Frame set.
First year the complete bikes had the model (600a etc) on the frameset.
Specs. TT and DT outside diameter was 1 1/4." Forks 1". Wheelbase was around 36" BB height was 10 3/4".
1983 700 - 4130 came complete with Sugino Maxi-cross cranks and Redline stem and Vbars.
1983 600a - 4130 came complete with Sugino 1pc or Sugino GT 3 piece cranks, Mild steel Kusuki Vbar and Sugino alloy and 4130 stem.
Both available in Chrome only. Your choice of black or blue parts.
1984 and into 85
1984 500 A - 4130 Series III frame set (MX-III). Sugino 175 1 piece cranks. Red to Yellow fade decals.
Available in White or Chrome only. (Made in Taiwan)
1984 600 B - 4130 ST-20 (MX-III? ST as in Series Three as in MX-II?) 104A forks (A as in all weld instead of the three spot?).
Available in White or Chrome only. Black with some grey background down tube decal with red Redline. ST-20 on seat tube and not 600b. Vbars and same pads as the 700P. Mostly black with some grey and red Redline written several times.
1984 700 P - 4130 Proline frame, same frame that the Carerra comes with. 101A Tapered forks.
Available in White or Chrome only. PL-20 on seat tube and not 700P. These use a Red to Yellow fade. Bike has 1 piece Sugino 175 cranks.
1985
1985 500 B - Tri Moly. 4130 front, mild steel rear triangle. MX-III type frame. Fully painted finish or all chrome. Econo stem.
Available in all Hazard Yellow (not partial Chrome like the 600 C) or Chrome.
1985 600 C - 4130 Front was painted or chrome, rear was chrome. MX-III frame. Forklifter stems. 1 piece cranks.
Available in Hazard Yellow, White or Chrome. Parts all black and chrome. Rear dropouts are gnurled. (Made in Taiwan)
1985 800 P - 4130 Proline frame and fork. Forklifter stems. 1 piece cranks.
Available in Turquoise/Chrome, Yellow/Chrome and White/Chrome
