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Old 12-25-11, 09:05 PM   #1
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What is the seatpost length that comes with a Trek 4300 hardtail in a size large?

Hi Folks

I have picked up a Trek 4300 (2004) hardtail in a men's Large and need to replace the suspension seatpost that's on there right now.

Does anyone know what the original seatpost length for this model and size?

Thanks!
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Old 12-25-11, 10:02 PM   #2
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Should be 31.6
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Old 12-25-11, 10:08 PM   #3
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Should be 31.6
For the diameter I'm okay, i measured and its 30.9.
What I'm looking for is the length of the seatpost.
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Old 12-25-11, 10:14 PM   #4
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Hard to say length wise. What size is the frame?
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Old 12-25-11, 10:17 PM   #5
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Hard to say length wise. What size is the frame?
Size Large.
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Old 12-25-11, 10:22 PM   #6
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Either a 367mm or 410mm length will work.
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Old 12-25-11, 10:28 PM   #7
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Either a 367mm or 410mm length will work.
Yeah, I thought 350mm would be short, its what is most commonly found on shelves.
Thanks
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Old 12-25-11, 10:29 PM   #8
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Originally Posted by xfimpg View Post
For the diameter I'm okay, i measured and its 30.9.
What I'm looking for is the length of the seatpost.
The correct diameter for a 2004 Trek 4300 is 31.6mm, as per Trek's official spec sheet and their tradition of using 31.6mm. Sounds like someone crammed the seatpost off a Specialized in there, since 30.9 is Specialized's signature size.
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Old 12-25-11, 10:42 PM   #9
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The correct diameter for a 2004 Trek 4300 is 31.6mm, as per Trek's official spec sheet and their tradition of using 31.6mm. Sounds like someone crammed the seatpost off a Specialized in there, since 30.9 is Specialized's signature size.
well now you've got me doubing my measurements! lol
can you post the link to the official spec sheet? Thanks
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Old 12-25-11, 10:46 PM   #10
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Go by the length of what is in there now. Otherwise, make sure you've got enough length for the post to go down a little past the junction of the seat-tube and down-tube.

Unless specified by manufacterer, that has always been my little rule.

Most frame makers usuually suggest something along the lines of about 4" of post in the frame, minimum, but that varies by company, and sme don't specify at all.
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Old 12-25-11, 10:48 PM   #11
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well now you've got me doubing my measurements! lol
can you post the link to the official spec sheet? Thanks

Since you bought it used, it's very possibly someone stuck a 30.9mm post in there with a shim for the 31.6mm tube. No biggie.

If that's the case, you could use either size post - 31.6mm without a shim, 30.9mm with.

Best bet: make sure you have the seat tube empty, use some good calipers to measure the I.D. of that.
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Old 12-25-11, 10:49 PM   #12
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Originally Posted by mechBgon View Post
The correct diameter for a 2004 Trek 4300 is 31.6mm, as per Trek's official spec sheet and their tradition of using 31.6mm. Sounds like someone crammed the seatpost off a Specialized in there, since 30.9 is Specialized's signature size.
Not really. Those are about the two most commonly used larger post sizes going, and have been for a while. I'd not call either one a "signature" thing.
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Old 12-25-11, 11:01 PM   #13
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well now you've got me doubing my measurements! lol
can you post the link to the official spec sheet? Thanks
I could, but unless you're a Trek dealer the link wouldn't work Lemme try attaching a copy to this post, I think PDF is allowed... darn, it's too large. Well here's the part you want (and BTW it does state the stock post length: 350mm).

Attached Images
File Type: jpg 2004_Trek_4300.jpg (94.3 KB, 9 views)

Last edited by mechBgon; 12-25-11 at 11:08 PM.
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Old 12-25-11, 11:03 PM   #14
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Not really. Those are about the two most commonly used larger post sizes going, and have been for a while. I'd not call either one a "signature" thing.
Well I've worked at a Specialized dealership, and at a Trek dealership, and I've never seen a Spesh with a 31.6 or a Trek with 30.9. I hope you're right and they did shim it, instead of just crushing the frame down to meet the 30.9mm post.
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Old 12-25-11, 11:46 PM   #15
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Well I've worked at a Specialized dealership, and at a Trek dealership, and I've never seen a Spesh with a 31.6 or a Trek with 30.9. I hope you're right and they did shim it, instead of just crushing the frame down to meet the 30.9mm post.
Uh, yeah.

I'm not saying anything contrary to that. Only that the seatpost size isn't exactly a "signature" of either one, considering many, many other companies use both those sizes as well.
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Old 12-28-11, 08:20 AM   #16
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Thanks folks, it was a 31.6, and is now purchased and installed.
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