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Also known as the BB, the bottom bracket happens to be the ‘engine’ of your bike’s chainset.
Furthermore, BB is one of the two main bearings on the bike. The headset is the other bearing.
Undoubtedly, the GXP bottom bracket and BB30 bottom bracket are among the top BB models out there.
It can be challenging to choose the right BB for your bike when you want to replace the existing unit.
If you are planning to do so, this article will help you decide between the two models.
Let’s explore them individually to help you choose the one that suits you best.
GXP vs BB30 Bottom Bracket – Comparison 2020
Last update on 2020-11-24 / Affiliate links / Images from Amazon Product Advertising API
GXP Bottom Bracket
The SRAM’s GXP Blackbox Ceramix Bottom Bracket would be a good pick if you want a functional and durable unit.
This BB comes with a ceramic bearing technology that makes it smooth while you ride your bike.
Plus, the bottom bracket comes at a much lighter weight compared to most units.
To be specific, the model measures 5.1 by 3.4 by 2.2 inches and it only weighs 145g.
Another feature worth pointing out is the more rounded cut that reduces the mechanical drag.This also helps to create an optimal power transfer.
The ceramic bearings don’t only make the whole bottom bracket one of the smoothest. Rather, they are also moisture and dirt resistant.
In turn, you can be sure of a durable bottom bracket that performs perfectly in any season.
We loved the alloy cups on this bottom bracket, along with the red anodized finish.
You won’t have to worry about rust or any corrosion. Besides, the red color adds some glow to the bracket.
This BB is designed to use 78% less energy, along with careful maintenance. The left-side bearing located between the drive-side bearing and the left crankarm allows the drive-side bearing to easily float axially on the spindle. In the long run, this helps to minimize the bearing wear.
Furthermore, you won’t have to side-load the bearing when you are making adjustments.
Keep in mind that the BB comes with CNC-machined aluminum. With this, you are sure of a lightweight unit that is also strong and durable enough.
The installation of BB is easy too. As long as you have tightened it to the right specs, you’ll be set to go.
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BB30 Bottom Bracket
The Wheels Manufacturing BB30 to Outboard Bottom Bracket is another model worth purchasing.
This one comes in smaller than the previous product at 4.5 by 2.3 by 2.3 inches. But it is slightly heavier as it weighs 153g.
Nevertheless, the BB is a good performer too that is sure of lasting for a long time. It features strong anodized machined aluminum cups that enhance its overall durability.
The bottom bracket has been specially designed for installing 24mm cranks into BB30 frames. And the best part is that you won’t need any adapter for that.
There are two silicone seals on each bearing, which helps to keep them safe from any contamination. In other words, the bearings on this BB are meant to serve you for a long time.
The maintenance of this bottom bracket is also minimized since the bearings are perfectly sealed.
Replacing the bearings on this BB is easy, and you can always be sure of smooth operation with it.
You don’t have to worry about riding your bike in any weather condition when you are working with this unit.
The anodized finish makes it rust and corrosion-resistant. Keep in mind that the bearings are sealed with silicone to prevent moisture or dust.
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Difference Between BB30 and GXP Bottom Bracket
These two bottom brackets perform decently. However, some features differ from each other if you pay attention to the details.
Here is a look at how the two BBs compare.
The first major difference between the two bottom brackets is the size.
The BB30 bottom bracket comes in slightly smaller than the GXP BB.
However, the SRAM’S GXP BB is lighter in weight by around 8 grams. It might seem unnoticeable, but there is some difference in terms of performance.
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If you love a colorful unit that adds some elegance around your chainset, the SRAM GXP BB should be the best choice for you.
You get a nice red-black theme with the GXP bottom bracket, while the BB30 unit offers you a solid black color. The BB30 model would suit you if you prefer a low-key look.
Well, both these bottom brackets come with sealed bearings. The only difference is in the type of seal on each of them.
The SRAM’s GXP Blackbox Ceramix Bottom Bracket offers you a ceramic seal on the bearings.
On the other hand, the Wheels Manufacturing BB30 to Outboard Bottom Bracket offers you a silicone seal on both bearings.
While the type of bearing seal might be different, both seals are reliable enough to protect the bearings from moisture and dust.
Another difference is that you will need an adapter when installing 24mm cranks into the GXP BB. However, the BB30 lets you install the 24mm cranks without the need for an adapter.
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Frequently Asked Questions
How long should a bottom bracket last?
That depends on several factors, including the weather condition, how often you ride the bike, and adjustments.
If you have a well-adjusted bottom bracket, it should serve you almost forever. Most of them can last for 25K to 50K miles.
Should I use an adapter on my bottom bracket?
Ideally, you should avoid using an adapter on your BB since the adapters can cause creaks and other bearing alignment problems.
How long will the bearings last?
This will be affected by road conditions. All in all, a good set of bearings should last between 8K and 12K miles.
Which is the best maintenance tip for bearings?
Preferably, clean and re-grease the bearings after each 3K miles to keep it in a good condition. For the extreme riding conditions, do so after every race.
Can I replace the bearings?
For the sealed bearing bottom brackets, you get the chance to replace the bearings onboard without degrading the cup.
There you have it, riders. You now have an idea of the difference between these two BB models.
With this GXP and BB30 bottom bracket comparison, you can decide the model that suits your bike’s needs. Always ensure that you take care of the bottom brackets at all times.
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