ZTTO 11T MTB Bicycle Rear Derailleur Jockey Wheel Ceramic Bearing Pulley AL7075 CNC Road Bike Guide Roller Idler 4mm 5mm 6mm

ZTTO Bicycle Rear Derailleur Ceramic bearing

Pulley Jockey Wheel

All the results of the simulations and the experimentations indicated that the ceramic ball bearings' performances are very good, especially in the low load and high-speed environment.

Size:11T

Structure: Ceramic bearing

Material: aluminum alloy 7075

Color: Black Red Blue Silver Gold

Weight: about 7.8g

Fit for 4/5/6 MM roller screw axis

Apply for most of rear derailleur on the market

ZTTO CERAMIC PULLEY

Suitable for all cycling applications, whether it is road, MTB, or triathlon, these pulley wheels will optimize your speed rear derailleur with reduced friction and extended lifetime. Being the fastest spinning bearings on your bike, an upgrade with our high-performance pulley wheels are an effective way to save energy or ride faster.

Aluminum Pulley Wheels

Weighing only astonishing 7.8g grams, these lightweight pulley wheels are fitted with hybrid ceramic bearings, which reduce friction and feature increased lifetime. The aluminum alloy is very durable, and together with the pulley design, the set optimizes the overall performance of your derailleur. The removable design also makes the maintenance much easier.

POM Bearing Rings

For guide pulley, we use POM bearing rings instead of steel bearing rings, POM is an engineering thermoplastic used in precision parts requiring high stiffness, low friction, and excellent dimensional stability. They are also extremely light weight, that is why we can make a 7.8 grams pulley wheel. They are also resistant to water and salty environment and they will never need lubrication or getting rusty.

ZTTO Premium Hybrid Ceramic Bearings

About ZTTO Premium Hybrid Ceramic Bearings

ZTTO bearings feature rolling balls made of a ceramic material. The rolling balls are constructed of silicon nitride or zirconia ceramics.

Using ceramic bearings in hubs, bottom brackets, and pulleys will reduce friction. By reducing the coefficient of friction, you can accelerate faster and maintain speed with less power input.

Benefits of ceramic bearings:

Ceramic bearings have 10% less friction than steel bearings.

Bearings are extremely wear resistant because ceramic material is much harder than the hardest steel bearings.

Silicon nitride balls are 60% lighter than steel balls.

Safe operation even when using low amounts lubricant, which reduces the viscous drag friction from lubricant.

When used with special seals and lubrication, the friction in ceramic bearings can be 20-30 times lower than steel bearings with standard friction seals and standard lubrication.

There are different types of ceramic bearings on the market, such as full ceramic bearings, steel ceramic bearings and nylon ceramic bearings. Full ceramic bearings make use of both ceramic balls and race. These bearings are impervious to corrosion and rarely require lubrication if at all. Due to the stiffness and hardness of the balls and race these bearings are noisy at high speeds. The stiffness of the ceramic makes these bearings brittle and liable to crack under load or impact. Because both ball and race are of similar hardness wear can lead to chipping at high speeds of both the balls and the race this can cause sparking. So, instead of the full ceramic bearings, the best solution for bicycle is hybrid bearings.

ZTTO use hybrid ceramic bearings for high-end applications. Compared to all steel bearings, they have lower friction, lighter weight and longer service life. They are also less susceptible to failures caused by dirt, dust and poor lubrication.

Ceramic bearings have 10% less friction than steel bearings.

Bearings are extremely wear resistant because ceramic material is much harder than the hardest steel bearings.