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Trek seat post question

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Trek seat post question

Old 08-30-19, 09:11 PM
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Trek seat post question

So I got my new 2020 Domane SL5 and there was some grease at the top where the seat post inserts into the frame. Guess it piled up when they lowered the seat so it could fit in my car.

Anyway, I was raising the seat back up and the post is coated in grease, but the grease is gritty, like it's mixed with fine sand. Is this stuff supposed to be gritty? Never seen anything like that before.

On another note, I was given a packet: owner's manual, DVD, a bag of parts, the only thing of which I recognized was the orange plastic piece to insert between the brake pads after removing a wheel.
I expected to find info on these parts in the book after I got home...but there was nothing at all. So I played the DVD and it was just the same owner's manual I read and a prompt to register the bike. Where do I get info about all these pieces in the bag? The saleman didn't say anything about it.

I saw a basic assembly .pdf file on the Trek website, but it doesn't really tell me much.
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Old 08-30-19, 09:13 PM
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Yes itís carbon paste.
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Old 08-30-19, 09:16 PM
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The grit is to help hold the seatpost in carbon fiber. The spacers are so you don't accidently close the brakes...
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Old 08-30-19, 09:29 PM
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That the full length of the post is coated is another positive. Post/tube corrosion usually starts at the post's bottom and if the assembly paste is lacking that portion of the post can often be unprotected. Andy
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Old 08-30-19, 11:45 PM
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The little orange tab is for inserting between the disc brake pads in your brake calipers. In case you remove your wheel, they essentially take the place of the disc rotor whilst the wheel is out of place. This is to prevent the pistons of the brake from coming out too far if the brake lever is accidentally bumped whilst during transport/maintenance.

As others have said already, that "gritty grease" is carbon assembly compound. It is not actually a grease, what it is designed to do is to provide traction to carbon components and a barrier between said components (to prevent corrosion). Park Tools carbon assembly compound is SAC-2, other manufacturers might call their versions different names.
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Old 08-31-19, 04:58 AM
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If you post a photo of the parts you arenít sure about, folks here can probably ID them. Or just ask next time youíre at the LBS.
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Old 08-31-19, 05:45 AM
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Maybe ask the shop you bought the bike from what the other parts are for?
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