Triumph pre-unit swinging arm 500 – 650 1955-1962

Triumph pre-unit swinging arm 500 – 650 1955-1962


Triumph pre-unit swinging arm 500cc – 650cc from 1955-1962.

I had this swing arm with a pre-unit frame. It was part of a project that I was building up. I have sold the frame and most of the other parts. Somehow, this swinging arm got missed out.

This swinging arm is in decent condition. The cast number is very difficult to read. It looks like F3582 or F3532. Anyway, the cast number doesn’t necessarily mean it is also the part number.

Here are the part numbers from 1955 to 1960. The cover the 500cc models and the 650cc bikes.

  • 1955 – F3778
  • 1956 – F3778
  • !957 – F1431
  • 1958 – F1431
  • 1959 – F1431
  • 1960 – F4131

Please use the dimensions in the images as a guide to make sure that you are buying the right swinging arm.Frankly, I can’t see the difference at a glance.

I am happy to measure anything specific. Please ask before you buy.

  • Inside the spindle forks – 7-1/2″
  • Inside the front attachment – 4-7/8″


Shipping is charged ON TOP of the price for the item. There are too many variables to include shipping in the checkout, so please contact me before you buy and I will give you a shipping price.

I usually ship to most destinations.

International shipping available. Let me know where you are and I will send you a price for shipping with tracking

Combined shipping available. 

Viewing: Please come and check it over before you buy. It is at PE28, near St Ives in Cambridgeshire.

Collection: If you don’t want it shipped, I have plenty of space. If you can’t collect for a while, it’s not a problem. However, I will need to be paid very soon after the sale. Thanks.

Payment: Good old fashioned money on collection is preferred. I can accept payment through PayPal or by bank transfer as well. I can accept EUROS. Please ask. 

Import Taxes: Please note that IMPORT DUTIES are not something I can control. If you are buying from outside the UK, there is a chance that you will have to pay import taxes. Import taxes vary from country to country. If there are charges to pay, it is the buyer’s responsibility to research the cost and pay the duties. The price that you see on my advert is for the item and not the item plus whatever taxes might be due.

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