Steerer length and Stack Height

Tomianson

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Simple question just to confirm in my head if thats ok.
When determining the steerer length needed for a fork, its the head tube length plus the Stack Height of the headset isnt it? I've always measured it before and cut and got it right, but just wanted to check the mathematical method is that simple?
Thanks
 

raidan73

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That's it Tom 👍 Obviously you need to allow a mm or two for the lip or rubber seal on the top lock nut of a threaded headset
 

Tomianson

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Cheers. Will double check it against the manufacturers figures abs will allow a couple of mm for the rubber lip on the top nut. Better a couple of mm too short than too long.
 

FluffyChicken

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It's everything. H Is headtube length yes.
I link one of the old biking bibles, it got more than enough info there, from first steps of measuring.

The details for the Shimano are from the HP-M90x headset.
 

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