BuildMyMTB
Prototype - Evolving Daily

S&M 19mm/24mm Mid BB Kit (19mm) Bottom Bracket

Bottom Bracket: Fits a mid bottom-bracket shell; Spindle 19mm. 1 verified variant.

What the checker says43will not fit

Run variant by variant through the BMX 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 632 verified BMX parts in this catalog. 589 produced no finding of any kind.

Will not fit

    Bmx bb spindle, Cranks. 28 more findings from the same check, on up to 1 of the 38 verified cranks each.

    Bmx bb shell, Frame. 15 more findings from the same check, on up to 1 of the 79 verified frames 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.

    $26.95 MSRP

    What the maker states

    Shell
    Fits a mid bottom-bracket shell
    Spindle diameter
    Spindle 19mm
    The rest of what the maker states1 not published

    1 further field the checker looks for is not published by S&M, so we leave it blank rather than estimate it, and that check stays silent on this bottom bracket. It is spline pattern. Each is recorded as “not stated by the maker (not checked)”.

    Source: the maker’s page. Last checked 2026-07-27.

    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 495 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

    All S&M bottom bracketsOpen a variant in the builder to see the ones that apply to your own parts