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1952 Rudge Rebuild: AW hub needs an indicator

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1952 Rudge Rebuild: AW hub needs an indicator

Old 05-02-21, 05:36 PM
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Road Fan
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1952 Rudge Rebuild: AW hub needs an indicator

One thing I noticed on my 1952 Sturmey Archer AW which came to me on the 1952 Rudge, is that the indicator chain is bent sideways, and at that point has separated into two halves. I think I can straighten it all out but for another 50 years of riding I should just replace the indicator. It works ok just sitting on the workstand and was ok on my short "Do I like it?" ride, but I think I should have a durable connection there if I'm going to put the bike in my stable and use it. And, it broke.

I have seen there were several sizes made - is the correct indicator very individual i.e. a matter of tuning, or is there a selection guide somewhere or in somebody's head, to tell me what is the correct selection? how do I decide what version of "the Indicator" is correct for my hub and my bike?

Would the same indicator also work for an alloy AM or FM (I have a 4-speed compatible period trigger shifter original to the bike by all indications, lol) of the middle 1950s?
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Old 05-02-21, 06:32 PM
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Originally Posted by Road Fan View Post
One thing I noticed on my 1952 Sturmey Archer AW which came to me on the 1952 Rudge, is that the indicator chain is bent sideways, and at that point has separated into two halves. I think I can straighten it all out but for another 50 years of riding I should just replace the indicator. It works ok just sitting on the workstand and was ok on my short "Do I like it?" ride, but I think I should have a durable connection there if I'm going to put the bike in my stable and use it. And, it broke.

I have seen there were several sizes made - is the correct indicator very individual i.e. a matter of tuning, or is there a selection guide somewhere or in somebody's head, to tell me what is the correct selection? how do I decide what version of "the Indicator" is correct for my hub and my bike?

Would the same indicator also work for an alloy AM or FM (I have a 4-speed compatible period trigger shifter original to the bike by all indications, lol) of the middle 1950s?
Measure the length of the barrel of your indicator; I've seen many size variations of those. You can probably get away with a different length barrel than what you have now, but it'll affect the cable adjustment (i.e., the usual methods won't be accurate).

On AM and FM hubs, they use a two-piece indicator--not compatible with AW.
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Old 05-02-21, 09:05 PM
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If your axle measures 5 3/4" (likely on a '52 Rudge), you need a K504Z indicator. This was recently in Sturmey-Archer time (a little over 50 years ago) re-part-numbered HSA125 and called a 'Mark I'. It's actually got a 'mark' on it!

If your axle measures 6 1/4" (much less likely), you need a K504AZ indicator. This was re-part-numbered HSA126 and called a 'Mark II'. Hold on to your hat - it's got two 'marks' on it!

I no longer expect an LBS to have a divider drawer of Sturmey parts, but come on, man. If they don't have HSA125s and HSA126s, shake your head and mutter loud enough they can hear, "next day to my door, Amazon." While you're at it, buy two, put the spare one in your patch kit. Fun fact: these are such common and commonly spared parts that there's now also a non-Sturmey-Archer brand Sturmey-Archer indicator rod, SunLite.

Handy to know: It's not the end of the world if you don't have the right one (provided the indicator isn't overly long). Use the 'Sheldon Brown gear alignment method':
https://www.sheldonbrown.com/sturmey-archer/adj.html

More than you wanted to know:
https://www.sheldonbrown.com/indicators.html

Much, much more than you wanted to know - deep secret knowledge smuggled out of the cobweb-infested basement archives at great personal risk:
https://www.sturmey-archerheritage.co.../view-1222.pdf

Last edited by tcs; 05-02-21 at 09:10 PM.
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