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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 26th July 2021
Jberg93 Jberg93 is offline
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Default What's the difference between these two progressive shocks ?

I found two different shocks for my 1975 ironhead on DK. The first one is part number 58739 , the Second one is part number 58663. also do you think progressive is worth 170 more than the v twin shock they have ?
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  #2  
Old 26th July 2021
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#58739 is 412-4018C
#58663 is 412-4012C
Here's the progressive technical catalog (See Page 7):
https://www.progressivesuspension.co...-Tech-Info.pdf
Other Progressive Docs: https://www.progressivesuspension.com/c/tech-info

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  #3  
Old 26th July 2021
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Both are junk, at least the Progressives are and I suspect the V-Twin will be even worse. Do your bike a favor and get a good set of shocks from Hagon, Ikon, Gazi, Works, etc. Nothing helps an old Ironhead more than decent damping and springs on the rear end.
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Old 27th July 2021
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You feel the better shocks on every ride, this is a good investment.
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Old 27th July 2021
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Progressive 412 shocks are garbage. I purchased a set for my Ironhead project a few years ago. They lasted 300 miles and started leaking from the bottom of the struts. I exchanged them under warranty and the second set lasted about 500 miles with the same leak. They basically told me I was SOL with the 1 year warranty expired.
The small metal welded tab that the preload adjuster sits on will leak from the welded area on the bottom of the oil charged strut.
The Progressive 412 shocks are sold under a few names including VTwin and Drag Specialties.
I found a good set of used OEM shocks on Ebay and went that route.
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  #6  
Old 27th July 2021
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I'll endorse Works Street Trackers, Probably 15 years old now still like new, but rebuild-able if needed.
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