Promax EX-2 External 30mm Euro Bottom Bracket

Promax EX-2 External 30mm Euro Bottom Bracket

Marsoni

M251S

$54.00

Get it in 3 business days with 1 day shipping. Friday, May 29

Promax EX-2 External 30mm Euro Bottom BracketThe Promax EX 2 English bottom bracket features forged and CNC machined aluminum cups, dual lip labyrinth low friction seals, and custom sealed bearings. Features Strong, stiff and lightweight forged and CNC machined aluminum cups Dual lip labyrinth low friction seals keep elements out without affecting pedal efficiency Custom sealed bearings are smooth and long lasting For use with 30mm diameter crank spindles such as RaceFace Easton CINCH

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Called around for quotes to get them replaced and everyone was quoting over $2k just for bellows. Figured I’d give it a try. The rubber is good quality and feels soft. Time will tell but this is an easy job if you’re mechanically inclined. Make sure you replace the plastic water pickup fitting while you’re at it. Found mine to be cracked on disassembly and had to wait for a new one. Should be a easy 3-4 hour job if your not doing the bearing and only doing bellows

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Reviewed in the United States on August 26, 2024

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Ben

Chelsea, US

★★★★★ 3

Just ok

Qualities OK, but for Marine applications might want better

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Reviewed in the United States on August 3, 2025

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Barbara S.

Lake Worth, US

★★★★★ 5

Great quality

Just as described.

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Reviewed in the United States on July 22, 2025

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Paul Kirchberger

San Leandro, US

★★★★★ 5

Bellows kit review initial inspection’s

Very good quality. The hose clamps were event the better ones you have to pay extra in most cases.

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Reviewed in the United States on April 6, 2025

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Captain Ron

Cuba, US

★★★★★ 5

Good value, very useful for go kart wiring

Size: 100ft, Style: 6C-18AWG

It's a good spool to have around to wire lights and things on the go karts. Also came in handy when I had to patch a bit of melted wire harness on the tail of the old Dodge.

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Reviewed in the United States on May 6, 2026