If your carbon parts are slipping, Motorex Carbon Grease will help keep them in place.

A carbon assembly compound is essential for securing carbon components together, such as ensuring a carbon fibre seatpost doesn't slip in a frame. I've been using Motorex's Carbon Grease on a new 3T carbon seatpost in a carbon frame for the past few weeks through all sorts of weather, and haven't had a single problem with slippage.

The grease essentially increases friction between two surfaces, and can lower the clamping forces needed to hold a component in place. If you've ever had to overtighten a seatclamp to stop the post slipping, that is the time for carbon grease. The grease, paste or compound as it's commonly referred to, has a gritty texture between the fingers. This gives the carbon component a rougher finish so there's less chance for the part to slip.

It can be used with any carbon component, be it a handlebar, stem or seatpost. It can be used on a carbon steerer, seat rails, where the stem or brake levers clamp the handlebar, though many carbon handlebars come with a roughened area to avoid the necessity for a carbon assembly compound. Anywhere you need to avoid parts slipping, it can be used.

It's available in three sizes, including a 5g tube which is ideal if you're just building one bicycle, and is certainly more cost effective than buying this 100g tub. This will probably be sitting in my shed for years to come, but at least I'll never be short for any future bike builds. Application is made easy with a brush incorporated into the lid, so you needn't get your fingers dirty.


Essential if you're fitting carbon fibre components.

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road.cc test report

Make and model: Motorex Carbon Grease

Size tested: 100g

Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Ideal for assembling parts made of carbon and aluminium (saddle rails, pedals, brackets etc).

It easily provides effective protection against corrosion of standard and exotic materials.

Motorex's Carbon Grease makes it easiy to dismantle and reassemble parts.

Includes applicator brush.

Tell us some more about the technical aspects of the product?

This grease is completely transparent, and contains no textured parts.

Rate the product for performance:

Does what it says on the tin.

Rate the product for durability:

No problems so far.

Rate the product for value:

Buying a 100g tub is only for the serious home mechanic.

Tell us what you particularly liked about the product

Prevented carbon seatpost slipping.

Did you enjoy using the product? Yes.

Would you consider buying the product? Yes.

Would you recommend the product to a friend? Yes.

Overall rating: 7/10

About the tester

Age: 31  Height: 180  Weight: 67

I usually ride:   My best bike is:

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, touring, mtb,


David has worked on the road.cc tech team since July 2012. Previously he was editor of Bikemagic.com and before that staff writer at RCUK. He's a seasoned cyclist of all disciplines, from road to mountain biking, touring to cyclo-cross, he only wishes he had time to ride them all. He's mildly competitive, though he'll never admit it, and is a frequent road racer but is too lazy to do really well. He currently resides in the Cotswolds.


ronin [279 posts] 5 years ago
1 like

This is a very bad review bordering on mis-information! Let me explain. The average carbon assembly compound uses gritty particles to create friction as the reviewer mentions. This product doesn't.

Product Description
Motorex Carbon Grease is unique for a number of reasons. Most notable is that it lacks the suspended particulates you'll find in typical carbon assembly paste. Where the others use these microspheres to increase the traction between the slick finishes of carbon parts, the Motorex formula relies on a special ability to increase friction under high pressure. The difference is chemical rather than physical, yet the result is the same.

Would have been nice to compare this with other gritty carbon assembly compounds.