SAC-2 Lube Assembly Compound (4-Ounce)

This saved my knees. During long rides my seat post would slide down very very slowly. By the end of the ride my seat was too low and causing knee pain. The slipping seat post and knee pain wasn’t obvious at first. I finally used this product and my seat post does not slide down at all anymore and knee pain has been significantly reduced.

I recently purchased the Park Tool SAC-2 Assembly Compound to use on my bike's carbon seatpost and handlebars, and it worked exactly as advertised. Application was easy — just a small amount provided a noticeable increase in grip, and I didn’t have to overtighten anything to keep it secure. It gave me a lot more confidence, especially knowing how sensitive carbon components can be to over-torquing. The texture of the compound is a little gritty because of the silica, but that’s what helps create the extra friction. I was careful to wipe away any excess to avoid cosmetic blemishes, as the instructions recommended. Also, I made sure not to use it on any threaded parts or bearings, since it’s not designed for that. Overall, I’m really happy with the SAC-2. It’s a simple product that makes a big difference in keeping everything tight and protected. Definitely a great buy if you're working with carbon or aluminum parts!

This lube works great on my carbon parts as well as my dropper post.

So, I'm packing 350 pounds on a brand new Schwinn Electric Bike and the bike seat kept slowly sliding down after 10 minutes of riding the bike. This supergrip compound did the trick. After applying this product to my alloy aluminum e-Bike seat post, I was able to ride 3 miles at 20MPH and the bike seat never moved. Amazing recommendation. This product was not available at the local sports stores so Amazon Prime came through for me as usual. Thanks team! Creates a tighter grip between surfaces, reducing the amount of clamping force needed to safely secure a component Ideal for carbon or lightweight alloy bike handlebars, stems and seat posts.

Park Tool Bicycle Assembly Friction Grease This carbon/aluminum frame bicycle assembly grease is not intended for lubrication as it contains volcanic pumice, similar to mechanic's hand soaps. The grease is merely a convenient carrier for the pumice. This grease easily wipes up / wipes off bike parts and is colored blue so you can readily see where it has been applied. My bike seat post-to-frame and the seat-to-seatpost both needed to be tightened without breaking any carbon parts. The pumice promotes high friction between parts that are squeezed / clamped together with tightened bolts. Due to extra friction provided by the friction grease, the bolt tightening does not have to be overdone and risk cracking $$ carbon parts. NOTE: I have not tried other brands of bike assembly grease but the amount of pumice seems minimal in this product.

Well... I was skeptical about this product. I weigh in at around 210 lbs. The street pavements in my city are, shall we say, the result of defered maintaince: lots of pot holes, asphalt patches and surface breaks. In other words, my butt was like a jack hammer on my seat post. After every ride I had to readjust my seat post. But, lo and behold, this lube compound from Park Tool actually does the job. I've ridden several hundred miles since applying the compound to my seat post and I don't think its moved a millimeter. Good product that does what it's designed to do. BTW, my seatpost is alloy, not carbon.

I'm about 240lb and 6'4" so lots of pressure, leverage, etc where last 4 bikes regardless of clamp, double clamp, tightness, post, dry, etc seatpost would slip. I have aluminum to aluminum, not c-fibre.. the competitor product that is marketed to carbon for anti slip did not work at all, made it worse. The only thing that worked was cleaning it and adding climbers chalk, as weird as that sounds, but with the chalk I'd have to reapply, and it would creak a bit. So I tried this park product and it actually worked. No slip, no creak. Finally.. very happy with this. Don't hesitate to purchase this.

My One Up dropper post has always slipped in the seat post of my Hightower. I previously tried the Finish Line carbon grip paste, but that had absolutely no effect and the dropper would still slip. The grit in the Finish Line paste is fairly coarse/large and I suspect the grit was not actually getting between the interface when inserting post due to the clearance being tighter than the size of the grit. The Park Tools carbon grip compound has a much smaller, finer grit than the Finish Line product and initially I wasn't convinced there was anything in it when feeling the compound. I applied the Park Tools compound to the whole tube, convinced it wouldn't work, but then I couldn't get the post to go down fully due to all the friction! I had to remove the compound and apply to a much smaller area of the post to get it to insert and even then I could feel there was significant friction. The carbon compound product that you need will likely depend on how tight the interference is between your seat and post, but I found this to work where the Finish Line product did not.