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Atom 77 freewheel vintage Austro daimler

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Atom 77 freewheel vintage Austro daimler

Old 08-15-21, 11:05 AM
  #26  
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Originally Posted by Vintagerose View Post
If I put it on large front small back there’s so much slack it flops all over and hits the frame
That's because it's NOT routed right. Check my instructions in a previous post.
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Old 08-15-21, 11:04 PM
  #27  
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RD Chain Route - A Picture Is Worth A 1000+ Words

Originally Posted by oneclick View Post
That's because it's NOT routed right. Check my instructions in a previous post.
Vintagerose - Per oneclick instructions:

This is an older Campagnolo Record RD with metal pulleys but it's a good illustration of the proper chain route over the pulleys from the back side...



Front side view



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Old 08-15-21, 11:22 PM
  #28  
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The Problem With Verbal Instructions:

The Problem With Verbal Instructions or... A Picture Is Worth A 1000 Words!

6 Blind Men Describing An Elephant:



THREE! NO FOUR!


HaHaHa

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Old 08-16-21, 01:25 AM
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Back To The Original Topic - Atom 77 Freewheels

Atom 77 freewheels were introduced in 1977???

On original Atom freewheels all of the sprockets screwed on. They were interchangeable with Regina screw on cogs from that era.

The outer small cogs on Atom 77 Freewheels screwed on. The rest of the sprockets had 3 splines that slid onto grooves in the body. See pictures of markings on the rear of French and BSA FWs below to see the grooves.



Atom 77 Freewheels were made in 5 Speed, 6 Speed and COMPACT 6 Speed. The COMPACT (NARROW) 6 Speed version was narrower and made to fit on 120mm wide 5 speed hubs. Actually, back then the standard width for 5 Speed French rear hubs was 122mm OLN.

In the 1982 Atom/Maillard/Normandy catalog the 5 Speed Atom 77 Freewheels were only listed with a 14-24T range.



The standard width Atom 77 6 Speed Freewheel was designed for 126mm wide hubs and was listed with a 14-24T range. The Atom 77 Compact FWs were listed with a sprocket range of 13-28T.



Atom 77 Compact 13-28T Freewheel.



All of the Atom 77 freewheels were available in both M34.7x1.00 French metric thread and 1.375-24TPI BSA British thread. The thread sizes were stamped into the back of the bodies.



In a previous message, JohnDThompson mentioned the rectangular stamp in the rear of British thread Atom freewheels. That stamp was used on the older freewheels with all screw on sprockets.



The Atom 77 FWs used the same splined remover as the earlier models - they also fit Zeus 2000 and later splined Regina FWs.

Phil FW remover and Park FR-4 remover.




The Atom 77 freewheels were decent quality but lacked the tooth design of later styles that improved shifting...

Speaking of Atom FWs, here's a head scratcher:



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Old 08-16-21, 06:48 AM
  #30  
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verktyg excellent write up!

Vintagerose notice how square the tops of the teeth are in the above photos? That's why I mention the teeth on your large Atom 77 sprockets as being very worn.
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Old 08-16-21, 04:01 PM
  #31  
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Originally Posted by pastorbobnlnh View Post
verktyg excellent write up!

Vintagerose notice how square the tops of the teeth are in the above photos? That's why I mention the teeth on your large Atom 77 sprockets as being very worn.
yessir I see. I found an atom 5 speed with 2 extra teeth in the biggest cog to make 26. I imagine I should be able to strap that one up with no problems and be rolling again. Should be in soon.
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Old 08-17-21, 05:44 AM
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The above is the older Atom with all threaded sprockets (interchangeable with Regina threaded sprockets). Looks to be in acceptable shape. Probably would benefit from an internal cleaning and fresh grease. Great find!
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