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Brands: Shimano

Shimano Bottom Bracket Bsa 117.5/68mm Bb-un300 Square

AED69.00

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Brands: Shimano
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Shimano BB-UN300 square-taper cartridge bottom bracket for 68 mm BSA shells with a 117.5 mm spindle (EBBUN300B17X).

  • One-piece cartridge — no adjustment needed
  • Fits square-taper (JIS) cranks
  • Crank fixing bolts not included
Description
BSA
68 mm shell
117.5 mm
spindle length
Square taper
JIS crank fit
Cartridge
one-piece unit

The Shimano BB-UN300 is a square-taper cartridge bottom bracket — the one-piece unit that most city bikes, hybrids, kids’ bikes and entry-level mountain and road bikes are built around. This version fits a 68 mm BSA (English-thread) shell with a 117.5 mm spindle.

The bearings sit inside the cartridge, so there is nothing to adjust: thread it in, fit your cranks and ride. When the old one starts to creak, grind or feel loose, replacing the whole cartridge is the standard fix. Shimano also builds a chain line stabiliser into the design for steadier chainline.

Check these before you order

  • Shell: 68 mm wide, BSA / English thread. It does not fit Italian-thread, press-fit or 73 mm shells.
  • Spindle length: 117.5 mm. Match the length on your old bottom bracket (it is usually printed on the cartridge) — the wrong length moves your chainline and can stop the front shifting working properly.
  • Cranks: square-taper (JIS) only. Not for Hollowtech II, Octalink or other splined cranks.
  • Crank fixing bolts are not included.

Not sure which length you have? Send us a photo of your old bottom bracket on WhatsApp and we will check it for you.

Who it is for

  • Riders replacing a worn bottom bracket on a square-taper crank bike
  • Home mechanics and workshops servicing city, hybrid and kids’ bikes
  • Anyone whose old cartridge is marked 68 × 117.5

Full specifications are listed in the Information tab.

Not published for this exact code on the pages we checked: Shimano’s weight and the bearing seal type. Ask us if you need either.

Questions people ask

Does it come with crank bolts?

No. It is supplied without crank fixing bolts — reuse your old ones if they are in good condition, or ask us for a pair.

How do I know which spindle length I need?

Read the markings on your old cartridge (for example “68-117.5”) or measure the spindle tip to tip. Keep the same length unless a mechanic has told you otherwise — it sets your chainline.

Will it fit my mountain bike?

Only if the frame has a 68 mm BSA shell. Many mountain bike frames use 73 mm shells, which need a different version.

Can you fit it for me?

Yes. Fitting needs a crank puller and a splined bottom bracket tool — our Dubai workshop can do it while you wait for most bikes.

What is the Shimano code?

EBBUN300B17X, EAN 4550170619220.

Talk to us

WhatsApp +971 50 254 5363 · info@bikeera.com

Information
Weight0.35 kg
Dimensions14 × 8 × 8 cm
Brand
Product TypeSquare taper bottom bracket
Model CodeBB-UN300
Shell StandardBSA (English thread)
Shell Width68 mm
Spindle Length117.5 mm
Crank InterfaceSquare taper (JIS)
ConstructionCartridge
Adapter MaterialAluminium
Crank BoltsNot included
Manufacturer CodeEBBUN300B17X
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About brand

Shimano Components UAE — Groupsets, Parts & Pedals

Shimano is the world's most trusted name in cycling components, and Bikeera stocks a wide range of Shimano gear for UAE riders at every level. From road to mountain to urban cycling, Shimano's products cover drivetrain performance, braking, and pedalling efficiency with the reliability that has made the brand the benchmark of the industry. Shop all the Shimano components UAE riders need at Bikeera in one convenient place. We stock Ultegra and 105 groupset parts including cassettes, chains, and brake rotors. Our range covers the full SPD-SL and SPD pedal lineup alongside Shimano performance cycling shoes. Di2 electronic wiring, disc brake accessories, and 12-speed electronic upgrade kits are all available. Whether you need a full groupset or a single replacement part, we have you covered. Visit Bikeera in-store in Dubai to explore the complete Shimano range, or browse and shop anytime at bikeera.com. Free delivery across the UAE on orders over AED 150.

Jump straight to drivetrain parts, cassettes, pedals & cleats or cycling shoes — or ask our Dubai workshop to fit any Shimano part for you.

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