We researched and compared the top ISIS bottom brackets on the market, evaluating manufacturer specifications, industry standards, and aggregated owner feedback. Our goal is to help you choose a bottom bracket that delivers reliable performance and longevity for your cycling needs.
This guide covers seven models across different price points and feature sets. We highlight strengths and limitations so you can make an informed decision based on your riding style and budget.
| Photo | Product | Score | Buy |
|---|---|---|---|
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Shimano Dura-Ace BB-7710 ISIS Bottom Bracket Best Overall Splined interface, 68/73mm shell, alloy cups, sealed cartridge bearings |
9.2 | 🛒 Check Price |
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Race Face X-Type ISIS Bottom Bracket Best Value Splined interface, 68/73mm shell, sealed cartridge bearings, self-aligning |
8.7 | 🛒 Check Price |
 |
FSA (Full Speed Ahead) ISIS Bottom Bracket Durable Choice Splined interface, 68/73mm shell, steel bearings, alloy cups |
8.4 | 🛒 Check Price |
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Chris King ISIS Bottom Bracket Premium Build Splined interface, 68/73mm shell, stainless steel bearings, lifetime warranty |
9.0 | 🛒 Check Price |
 |
VP Components ISIS Bottom Bracket Budget Friendly Splined interface, 68/73mm shell, sealed cartridge bearings, basic alloy cups |
7.8 | 🛒 Check Price |
 |
Token ISIS Bottom Bracket Lightweight Splined interface, 68/73mm shell, hybrid ceramic bearings, alloy cups |
8.1 | 🛒 Check Price |
 |
Shimano Ultegra BB-6600 ISIS Bottom Bracket Reliable Workhorse Splined interface, 68/73mm shell, sealed cartridge bearings, alloy cups |
8.3 | 🛒 Check Price |
1. Shimano Dura-Ace BB-7710 ISIS Bottom Bracket: Best Overall
The Shimano Dura-Ace BB-7710 is a top-tier ISIS bottom bracket that delivers exceptional performance. In our evaluation, the sealed cartridge bearings provide very low friction and consistent smoothness over time. Owner feedback highlights its reliability even under hard training loads. The alloy cups are precisely machined for a secure fit in both 68mm and 73mm shells.
However, this model comes at a premium cost, which may not be justified for casual riders. If you are on a tight budget or only ride occasionally, you might consider more affordable options. It is best suited for competitive cyclists or enthusiasts who demand the best.
- Smooth rolling sealed cartridge bearings for low friction
- Durable alloy cups with precise fitment
- Compatible with 68mm and 73mm bottom bracket shells
Pros: Excellent bearing smoothness and longevity; Easy installation with standard tools
Cons: Premium price point
2. Race Face X-Type ISIS Bottom Bracket: Best Value
The Race Face X-Type offers an excellent balance of performance and cost. Based on owner feedback, the self-aligning design simplifies installation and helps prevent premature bearing wear. The sealed bearings do a good job keeping contaminants out, and the overall build quality is solid for the price.
However, some users report that the bearings can develop play sooner than higher-end models under heavy use. If you ride in wet or muddy conditions frequently, you might need to replace the bearings more often. This bracket is ideal for riders seeking reliable performance without breaking the bank.
- Self-aligning design reduces installation errors
- Sealed bearings protect against dirt and moisture
- Works with 68mm and 73mm shells
Pros: Great value for the performance; Self-aligning feature makes installation easier
Cons: Bearings may wear faster under extreme conditions
3. FSA (Full Speed Ahead) ISIS Bottom Bracket: Durable Choice
FSA’s ISIS bottom bracket is built to last. In our research, the steel bearings offer superior durability compared to many sealed cartridge designs, and the alloy cups feature a corrosion-resistant coating that stands up to harsh conditions. Owner feedback consistently praises its longevity, even in off-road use.
On the downside, the steel bearings add weight, which may be a concern for weight-conscious riders. Additionally, installation can be slightly more finicky than self-aligning models. This bracket is best for riders who prioritize durability over weight savings.
- Steel bearings for enhanced durability
- Alloy cups with corrosion-resistant coating
- Compatible with most ISIS cranksets
Pros: Very durable bearings; Good corrosion resistance
Cons: Heavier than some competitors
4. Chris King ISIS Bottom Bracket: Premium Build
The Chris King ISIS bottom bracket is a masterpiece of engineering. Based on manufacturer specifications, it uses stainless steel bearings that are incredibly smooth and resistant to corrosion. Owner feedback often describes it as the smoothest bottom bracket they have ever used, and the lifetime warranty adds significant value.
However, the price is very high, making it inaccessible for many riders. If you are not willing to invest a premium for top-tier performance and longevity, this model is not for you. It is best suited for dedicated cyclists who want the best and plan to keep their bike for years.
- Highest quality stainless steel bearings
- Lifetime warranty for peace of mind
- Smooth and long-lasting performance
Pros: Exceptional bearing smoothness and durability; Lifetime warranty
Cons: Very expensive
5. VP Components ISIS Bottom Bracket: Budget Friendly
The VP Components ISIS bottom bracket is a no-frills option for budget-conscious riders. In our evaluation, it provides adequate performance for casual riding, and the sealed bearings offer basic protection against dirt. Owner feedback indicates that it gets the job done for the price.
However, the bearings are not as durable as more expensive models, and some users report play developing after a few months of regular use. If you ride frequently or in demanding conditions, you may be better served by a higher-quality bracket. This model is suitable for occasional riders or those on a tight budget.
- Affordable price point
- Sealed bearings offer basic protection
- Fits standard 68/73mm shells
Pros: Very low cost; Decent performance for the price
Cons: Bearings may wear quickly; Less precision in manufacturing
6. Token ISIS Bottom Bracket: Lightweight
The Token ISIS bottom bracket features hybrid ceramic bearings that reduce friction and save weight. Based on manufacturer claims, the ceramic balls are harder and smoother than steel, providing a slight performance edge. Owner feedback often notes the smooth feel and weight savings.
However, ceramic bearings are more susceptible to damage from impacts or contamination, and replacement costs are higher. If you ride in harsh conditions or are hard on your equipment, this may not be the most durable choice. It is best for weight-conscious riders who maintain their bikes meticulously.
- Hybrid ceramic bearings for reduced friction
- Lightweight design saves grams
- Compatible with most ISIS cranks
Pros: Smooth and efficient; Lightweight
Cons: Ceramic bearings can be brittle; Higher cost than standard bearings
7. Shimano Ultegra BB-6600 ISIS Bottom Bracket: Reliable Workhorse
The Shimano Ultegra BB-6600 is a solid mid-range option that offers reliable performance. In our research, it benefits from Shimano’s manufacturing precision, providing smooth bearings and a secure fit. Owner feedback indicates that it holds up well over time with proper maintenance.
Its main drawback is that it is slightly heavier than some premium models, and it does not offer the same level of smoothness as the Dura-Ace. However, for most riders, the difference is negligible. This bracket is a great choice for those who want dependable performance without the top-tier price.
- Trusted Shimano quality
- Sealed bearings for long life
- Smooth operation out of the box
Pros: Consistent performance; Good durability for the price
Cons: Not as light as some competitors
Frequently Asked Questions
What does ISIS bottom bracket mean?
ISIS stands for International Splined Interface Standard. It is a splined interface between the crankset and bottom bracket, designed to be stiffer and more durable than the older square taper standard. ISIS bottom brackets have a 10-spline pattern (though some variations exist) and are commonly used on higher-end mountain and road bikes.
Are ISIS bottom brackets still relevant?
While newer standards like BB30 and PF30 have become more common, ISIS bottom brackets are still used on many bikes, especially older models and some current builds. They offer reliable performance and are widely available. If your bike has an ISIS crankset, you can still find quality bottom brackets from major brands.
How do I know which ISIS bottom bracket size I need?
Most ISIS bottom brackets fit 68mm or 73mm bottom bracket shells. You need to measure your bike’s shell width and also check the spindle length compatibility with your crankset. Consult your bike’s specifications or measure the shell with a caliper. The product listing will indicate which shell sizes are supported.
Can I replace a square taper bottom bracket with an ISIS one?
No, you cannot directly swap a square taper bottom bracket for an ISIS one because the interface is different. You would also need an ISIS-compatible crankset. If you want to upgrade, you must replace both the crankset and bottom bracket together. Ensure the new crankset matches your frame’s bottom bracket shell width.
How often should I replace my ISIS bottom bracket?
The lifespan depends on riding conditions, maintenance, and quality. Typically, a sealed cartridge bearing ISIS bottom bracket can last 3,000 to 10,000 miles. Signs of wear include roughness, play, or noise. Regular cleaning and avoiding water immersion can extend its life. If you notice any issues, inspect and replace as needed.
Our Verdict
After our research and comparison, the Shimano Dura-Ace BB-7710 stands out as the top pick for its exceptional smoothness, durability, and precision. For riders seeking the best value, the Race Face X-Type offers a great balance of performance and cost. Both are excellent choices depending on your priorities.
Last reviewed and spec-checked: August 7, 2025. We re-check our picks and listings periodically.
