Rear drum sizes

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Location: Ipswich

Rear drum sizes

Post by steve » Mon Sep 11, 2017 5:08 pm

Hello all

I have a Sportster iron head rear hub and I am wanting a smaller drum and and less teeth on the rear sprocket.
I think I heard once that a Triumph pre unit drum will bolt up to a Sportster hub. Apparently these are a 7 inch drum and the sprocket will bolt on.
Has anyone done this?
If not does anyone have a Triumph 7 inch drum witha bolt on sprocket sitting around that you can take some measurements from.
I need the center hole size and the PCD of the eight mounting holes.

Any other suggestions for a smaller drum on a Sportster hub would be appreciated.



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