Bb-un300-k Bottom Bracket
Earn up to Rs. 41.50 cashback with Club House
Description
The Shimano BB-UN300-K is a square-taper bottom bracket built for riders who want dependable, quiet pedalling at an accessible price. Whether you're navigating Pune's cracked urban roads, grinding up the Western Ghats, or logging steady kilometres through Chennai's coastal humidity, this bottom bracket keeps your crankset spinning smoothly with minimal fuss and long service life. Cobbled Climbs is the authorised retailer for Time in India.
Use Cases
Daily training. Reliable construction for repeat use.
Race day. Lightweight, stiff design for power transfer and aerodynamics.
Fit adjustment. Right stem length critical for comfortable bike fit.
Our Take
At Rs. 830, the BB-UN300-K is one of the most sensible drivetrain upgrades an Indian cyclist can make. Square-taper bottom brackets cop a lot of wear in our conditions — dust on Rajasthan highways, monsoon grit on Mumbai roads, and the torque demands of Ooty or Coorg climbs all accelerate bearing fatigue. Shimano's cartridge design keeps contaminants out reliably, and replacement is straightforward when the time comes. A smart, no-drama choice.
Sizing for Indian Riders
Bottom bracket sizing is about shell width and spindle length, not body dimensions. Indian riders on hybrid, commuter, or entry-level road bikes should confirm their frame's bottom bracket shell width (typically 68mm or 73mm) and the required spindle length for their crankset. Check your crank manufacturer's recommendation for spindle length before ordering. When in doubt, a local bike shop can measure your existing unit in minutes.
Compatibility Notes
The BB-UN300-K uses a square-taper (JIS) interface, compatible with the vast majority of Shimano entry and mid-range cranksets. It is not compatible with Hollowtech II, ISIS, or splined external-bearing cranksets. Confirm your frame's shell thread standard (BSA/English threaded is most common in India) before purchase. A bottom bracket tap and face tool ensures correct installation torque and thread alignment.
Pairs Well With
Complete your drivetrain service by pairing this bottom bracket with a compatible square-taper crankset, a quality wet-condition chain lubricant for monsoon riding, a chain wear checker tool, and a pedal spanner or multi-tool with hex keys for installation. A torque wrench is also worth considering for correct preload.
Explore the full Shimano collection at Cobbled Climbs | Learn more at Shimano
Specifications
| Specification | Detail |
|---|---|
| Brand | Time |
| Product Type | Bottom Bracket |
| Shipped From | Mumbai, India |
Explore the full Time collection at Cobbled Climbs
Why buy from Cobbled Climbs
- 100% genuine — authorised Time retailer in India
- Free delivery on orders above Rs. 2,500
- Cash on delivery available nationwide
- 7-day easy returns
- Shipped from Mumbai
- Expert advice — built for Indian cycling conditions
Frequently Asked Questions
What is the Shimano BB-UN300-K best used for?
The BB-UN300-K is best suited for commuter, hybrid, touring, and entry-level road or mountain bikes using square-taper cranks. It performs reliably across Indian riding conditions — from city traffic in Delhi and Hyderabad to trail use in Coorg — and is a practical replacement or upgrade choice for riders who want a durable sealed cartridge unit at an affordable price.
What size BB-UN300-K should I order?
You need to match two measurements: shell width (usually 68mm for road frames, 73mm for MTB) and spindle length (check your crank manufacturer's recommendation). If replacing an existing bottom bracket, the shell width and spindle length are printed on the old unit. When in doubt, a quick visit to a local mechanic or a message to the Cobbled Climbs team will get you the right size first time.
Will the BB-UN300-K hold up in monsoon conditions and Indian heat?
Yes. The BB-UN300-K uses a sealed cartridge bearing design that resists water ingress and fine dust — both common challenges during India's monsoon season and on dry, dusty roads in cities like Ahmedabad or Nagpur. Periodically check the bottom bracket for play or creaking after extended monsoon riding. Regreasing the threads at installation also helps prevent corrosion in humid coastal climates like Mumbai or Chennai.
How does the BB-UN300-K compare to external bearing bottom brackets?
The BB-UN300-K is a traditional threaded cartridge unit with a square-taper spindle, offering straightforward installation and replacement without specialised tools. External bearing systems (like Shimano Hollowtech II) offer lighter weight and stiffer power transfer but require a compatible crankset and more precise servicing. For budget builds and commuters, the BB-UN300-K's simplicity and low cost make it the more practical choice in Indian conditions.
Is the Shimano BB-UN300-K worth the price in India, and what warranty does it include?
At Rs. 830 with free delivery on orders above Rs. 2,500 and cash on delivery available across India, the BB-UN300-K offers excellent value. Shimano backs its components with a manufacturer's warranty against defects — check your purchase documentation for specific terms. For everyday cyclists and commuters in India, this bottom bracket delivers reliable service well beyond its modest price point.
Why pay full price when loyalty pays back?
Club House rewards you for every purchase — up to 5% cashback, 100 bonus points to start, birthday rewards, and early access to limited drops. It’s our way of saying thanks for riding with us.
Shipping:
We ship all orders within 48 hours, excluding Sundays and public holidays. Delivery typically takes 3 to 5 days depending on your location.
Returns:
If your item arrives damaged, incorrect, or doesn’t fit, you may request a return within 7 days of delivery. Email us at support@cobbledclimbs.com with your order details. Items must be unused and returned in original packaging with all tags and labels intact.
Sale Item Guidelines:
Products purchased on sale are final sale and not eligible for return or exchange. Please double-check sizing, fit, and product details before purchasing.
Please note:
We follow a no money refund policy. Eligible returns are offered store credit or exchange only.
Crash Replacement
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Bb-un300-k Bottom Bracket
Earn up to Rs. 41.50 cashback with Club House
Frequently Asked Questions
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Is Bb-un300-k Bottom Bracket currently in stock?
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What We Reach For
When the ride calls, we don’t think twice. A jersey that’s made to move. A computer that knows the way. A care kit that keeps it all running smooth. These are the pieces we reach for — ride after ride.
