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Added a comment about feature Shimano XT 12-Speed Long-Term Review 8/8/2020 7:24 AM
Unruly Baker

Been working on bicycle disc brakes since 1994, I’m pretty good at it. Not to say it’s impossible that I’m doing something wrong, but unlikely. I’ve even taken the brakes off the bike, hung them vertically, lever on top, bled them multiple times, ensuring everything correct, only to have issues return within a few weeks. As many others have stated, it’s not a bleed issue, it’s a design/hardware flaw/wear issue.

If nothing else, I may have finally found the one person in the world that can properly bleed every Shimano brake with inconsistent bite point issues.

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Liked a comment on the item Shimano XT 12-Speed Long-Term Review 8/1/2020 10:11 PM

I'm just disappointed because their previous 10 and 11s derailleurs would go years without needing clutch maintenance. The sealing is remarkably less effective than previous versions. I agree though...as long as people keep up on service, probably needed every 30-50 hours of ride time, then it's fine....more

Added a comment about feature Shimano XT 12-Speed Long-Term Review 8/1/2020 8:59 AM
Unruly Baker

I guess for me I see it less as a “failure” and more of a maintenance routine that the user needs to be aware of. It’s pretty easy to remove the cover and inject slick honey (I have a grease gun for slick honey left over from my old Turner frames) around the clutch pivot, cycle it a few times with clutch disengaged and tension backed off, then put the cover back on and retension and turn clutch back on. I’m in dry SLC, UT and am a bike washer, so makes sense why mine seized according to your experiences. I still like the drivetrain, $ for $ vs SRAM I’d buy the XT again. Just need to maintain the clutch.

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Added a comment about feature Shimano XT 12-Speed Long-Term Review 8/1/2020 7:35 AM
Unruly Baker

Anyone else had issues with their 8100 XT rear der. clutch seizing and locking up? I was getting tons of slack in my chain as I went to smaller gears since the der arm was locked up. Only issue I have had in ~400 miles. Had to disassemble the clutch and grease everything, reassemble and adjust tension. It’s been ok since then.

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Added a comment about feature Revolutionizing Carbon Bikes with Guerrilla Gravity - The Inside Line Podcast 2/1/2019 4:52 AM
Unruly Baker

Not HexMC. HexMC comes in epoxy and BMI resin but both are traditional thermosets with 350F cures. You can postcure the BMI up to 450F. See link to patent below. GG stuff is clearly thermoplastic. The higher impact strength and increased recycleabilty claims are the key give away that they are using thermoplastics.

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Liked a comment on the item Revolutionizing Carbon Bikes with Guerrilla Gravity - The Inside Line Podcast 1/31/2019 6:27 PM

Based on the material properties and Guerrilla Gravity's patent, thermoplastic composite is definitely in use. Those wanting to learn more about the family of materials and manufacturing process should check out our Patent Thread.

Added a comment about feature Revolutionizing Carbon Bikes with Guerrilla Gravity - The Inside Line Podcast 1/31/2019 5:57 AM
Unruly Baker

As an engineer working in automotive and aerospace composite automated fiber placement R&D for the last 15 years, this is RAD! My guess on their process is automated tack welding of thermoplastic prepreg (PEEK, PEKK, maybe PPS?) to make preforms, then load preforms into mold and heat to melt temp, consolidate and quench. Kapton tape in the images means they are going to 600 F or so to cook it. No reason to use that fancy expensive tape if your not going HOT.

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