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Ritchey RL1 External Cup EC Threadless Headset Headset

What the checker says14will not fit

Run variant by variant through the road bike builder’s own engine. Every sentence below is the checker’s, unedited. Nothing here says this part fits your bike; it says what it does and does not fit among the parts we hold.

Checked against 1030 verified road bike parts in this catalog. 1016 produced no finding of any kind.

Will not fit

    Rg headset steerer, Fork. 14 more findings from the same check, on up to 1 of the 17 verified forks each.

    Open a variant in the builder to see the ones that apply to your own parts.

    The checker compares the dimensions listed in what we check, and what we don’t. “No conflicts found” means no conflict among those dimensions — not a guarantee that a build works. Errors mean it won’t fit; warnings mean it works but check; infos are notes.
    Ritchey RL1 External Cup EC Threadless Headset
    Photo: Ritchey

    $39.95 MSRP·114 g

    What the maker states

    Upper
    Assembly EC34/28.6 (S.H.I.S.)
    Lower
    Assembly EC34/30 (S.H.I.S.)
    Steerer
    Straight-1-1-8
    Source

    Source: the maker’s page. Last checked 2026-08-25.

    Checked against

    The checker ran this model against every verified part below that it has a slot for, the same way it checks a build in the builder. What follows is the verdict it actually produced for that specific pairing — not a recommendation, and not a guarantee any of these parts fits your own bike.

    6 of 702 counterparts with a page of their own that the checker actually probed this model against, in alphabetical order by brand and model — never by price, popularity or the verdict itself.

    Where this sits

    Previous: Ritchey External Cup EC Threadless HeadsetNext: Ritchey WCS External Cup EC Threadless HeadsetAll Ritchey headsetsOpen a variant in the builder to see the ones that apply to your own parts