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SRAMGXP Blackbox Ceramic Bottom Bracket

Temporarily Out Of Stock

Item # SRM0372

Don't get too bummed. This item is on the way and will be available for purchase as soon as it rolls into the warehouse.

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Part of the allure of SRAM's Red component group is that it's designed and made with a pull-out-all-the-stops attitude, and that insistence on lighter, faster, better goes all the way to the bottom bracket. SRAM Red uses the GXP/Blackbox Ceramic Bottom Bracket. It's structurally identical to the Team GXP bottom bracket used in the Force group, except the Blackbox Ceramic GXP uses silicon nitride ceramic balls in the sealed cartridge bearings instead of the less expensive and significantly less round steel balls.

This greater roundness and superior hardness substantially reduces the mechanical drag of the bottom bracket as the crankarm spindle rotates through it. After aerodynamic drag, mechanical drag is the leading culprit in consuming the power you put into the pedals. Can you go faster with ceramics? The answer is a simple and emphatic yes.

SRAM's bottom brackets, while interchangeable between all SRAM cranksets, are brand specific -- meaning, they can only be installed with SRAM cranks. The key element that makes them different from a Shimano or FSA bottom bracket is that the left side bearing has a smaller diameter to mate with the stepped spindle of the SRAM crank. This design allows the inner race of the left side bearing to be captured between the crankarm and the spindle, effectively locating the crank. The right side bearing "floats" on the spindle handling only radial loads as you pedal. The SRAM design optimizes bearing load, minimizes drag, and gives you more durability.

The GXP/Blackbox Ceramic Bottom Bracket has alloy cups, anodized in Red, and is compatible with all SRAM road cranksets -- Red, Force, and Rival. It's available in your choice of English(68mm) or Italian(70mm) threading.

  • Made with silicon nitride ceramic balls in sealed cartridge bearings
  • Ceramic bearings are lighter and more efficient than standard bearings
  • Ceramic bearings use a more rounded cut to reduce mechanical drag
  • Compatible with all SRAM road cranksets

Tech Specs
Shell Width(English) 68 mm, (Italian) 70 mm
ThreadingEnglish, Italian
Recommended Usesuper silky smooth spinning
Manufacturer Warranty2 years

Claimed Weight

Claimed weights are provided by the vendor.

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145 g

Actual weights are measured in-house by the Competitive Cyclist team.

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What do you think about this product?



One supplier claims the bearings used here are made by Ceramic speed. Can you verify this? Same quality as their Name brand product? Thanks, Sandy D.

>Rating: 5

Great Upgrade

I've used it several times

I have ceramic bearings in my Cannondale frame but GPX ceramic is unbelievably smooth......and unlike the other reviewer......my first 75 mile ride on the new Pinarello F8 (see another review) with the new BB was so good kept looking at the crank! Worth the extra money!

>Rating: 4

Solid Bottom Bracket

I've put it through the wringer

First of all, I probably should have read the product description in more detail because the product I received was the red anodized color (not the depicted silver color). However, color wasn't a huge issue for me. So I slapped this on my bike, and haven't regretted it yet. I can say this was a solid upgrade from the Sram GXP Team BB.

>Rating: 5


I've put it through the wringer

I'm not 100% sure what "breaking it in" means, but I've used ceramic BBs since they were available (one of the most cost effective upgrades you can make IMHO) and have owned one of these for years. It's worked flawlessly since day 1 and I wouldn't hesitate to recommend.

>Rating: 1

Don't buy!!

I've used it once or twice and have initial impressions

If you have loads of time on your hands to "break it in" then by all means spend the $200.00, otherwise do not buy it. My old BB was way better and in fact I just had the shop put it back in until I have time to burn breaking in this waste of money.

Breaking in a bottom bracket makes as much sense as buying a 100% organic steel bike frame. Both instances use words in the English language but not in any recognizable or logical way.