CeramicSpeed T4730 Bottom Bracket

T47 is a standard created by custom frame builders in the United States. It's threaded, has an inner diameter of 47mm, and is 86mm wide. It has the design benefits of being oversized and wide, but also the practical benefits of threads.

This kit pairs those bb's with 30mm spindle cranks. The cups have CeramicSpeed bearings pressed in. There are two bearing options. The Standard Bearing has CeramicSpeed Balls and hardened-steel races. The Coated Bearing has the same balls running on a 3-micron thick coating placed on top of those hardened-steel races for greater durability and less friction still.

With the benefits of both oversized shells and the tight fit of threading, T47 has the best of both worlds. These cups and bearings make it possible to run stiff and light 30mm spindle cranks, like those from Rotor and FSA's 386EVO standard.

Standard Bearings reduce drag by 75% versus stock bottom brackets, dropping down to 0.3-0.4 watts per set. This is the result of hardened-steel races rolling ceramic balls that are 100% smoother and 15% harder than the ceramic competition. They also last longer.

Coated Bearings feature an even longer lifespan and even lower drag. Life increases by 60% and drag drops by 50% compared to our Standard.

Applied to the bearings at the factory is All Round Grease. It can be replaced for lower drag TT and Track Grease, or higher durability LongLife Grease, which adds a bit of drag but stays in when riding through messy conditions.

Features

Did you know that this product has a lifetime warranty? That's right: as of September 1, 2021, all CeramicSpeed 'Coated' products and OSPW cages (purchased after January 1, 2021) are covered for life -- that's how confident CeramicSpeed are in the durability of their products. You can check out the full terms and conditions here.

Coated bearings

CeramicSpeed's coating has several performance enhancing properties that makes it unique.Thanks to their continuous R&D program, CeramicSpeed have developed a special coating in cooperation with a European coating specialist. Applied to the steel races of the bearing, through an advanced process that ensures an even, smooth and homogeneous surface, the coating formula improves even further the high quality of the CeramicSpeed bearings.

Low friction-Once coated, the bearing races deliver a hardness level matched only by the CeramicSpeed balls, providing an extremely low friction coefficient between the two materials. The result is thus even less friction in their coated bearings than in their standard bearings.

Coating Graf Friction-The coating is a metallic layer, which is 75% harder than the hardened steel races. The coating is applied in a very thin and even layer of 3 microns (0,003 mm) on the entire surface of the bearing race. Both the inside and the outside are treated to achieve optimal results. As CeramicSpeed use a metallic coating on top of the hardened steel, it can be difficult to see that a bearing is actually coated. However, if you take a closer look at a coated bearing, you will notice that the surface has a different shine than a standard CeramicSpeed bearing.

Lifetime -The coating has several properties that improve the lifetime of CeramicSpeed's bearings. The increased hardness of the races combined with the super smooth and round CeramicSpeed balls, means virtually no wear on the bearing.

The coating layer is applied completely closed and homogenous. The formula used for the coating is extremely resistant to corrosion. This means that even if the bearing is contaminated with degreaser, water or mud, the risk of bearing failure due to corrosion is negligible.

How to achieve the optimal performance -The coated bearings are more resistant to lack of lubrication when it comes to wear and damage on the bearing nonetheless, this does not mean that the need for maintenance is completely eliminated. Just as CeramicSpeed do with their standard bearings, they recommend to always lubricate them with their special grease to achieve optimal performance in terms of low friction and long lifetime. For all training and racing applications they recommend the use of CeramicSpeed Blue all-round grease. If you want to achieve the lowest possible friction, CeramicSpeed recommend you to use their TT grease. Please be aware that compared to the standard Blue all-round grease, the TT grease has a shortened lifetime and therefore, it requires more frequent application.

Handmade in Denmark-Like all other CeramicSpeed bearings, their coated products are handmade in Denmark. This means all bearings are built by hand and inspected manually at each step in the production process. Building a coated bearing adds a number of extra steps to the process. The CeramicSpeed balls and steel races are matched within microns after which, each set of races is coated. The races are kept together in pairs through the entire process and after coating, each set needs to pass the quality control before they go into production.

CeramicSpeed coated bearings are available for pulley wheels, bottom brackets, wheel bearings and the Oversized Pulley Wheel System.

What's in the Box?

2 cups with bearings installed.

2 1mm spacers.

2 0.5mm spacers.

2 dust covers.

Wave washer.

Spacer tube.

10ml syringe All Round Grease.

Sticker sheet.

Installation tool.

Bottom Bracket Compatibility Matrix

* 30 mm cranks with a short spindle may have limited compatability.

** Does not fit a FSA crank from 2016 or newer.

*** Only BB30 fits shell width of 83 mm.