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FSA Seatposts

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19 Questions : 24 Answers

Q&A for Seatposts category

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Seatposts

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2 answers

How critical is the diameter?

I need to buy a seat post for a very old Marin Nail Trail. As far as I can work out, it's the 1997 model.

According to specs online, the post I need is 30.00mm. I measured the seat post hole in the frame (using a drop-in seat post hole measuring device) and my measurement is 30.3mm.

Should I stick to 30.00mm according to the spec or get 30.3mm?
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2 months, 2 weeks ago
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Answer: 
30mm would be a standard size, and you should find the frame clamps up fine. If the bike is very used, it's possible than continual manipulation of the seatpost over the years could have widened the seat-tube slightly. If in any doubt, have your local mechanic inspect the frame for any signs of fatigue.
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Answer: 
I have an unused 31.6 mm seat post that (without serious sand papering and grinding down) will not fit into my frame that is a 31.4mm diameter seat post holding frame. So I was going to get a 31.4 mm seat post for that bike.
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3 weeks ago
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I have a Giant XTC Advance 2 with carbon frame and 27.2 carbon seat post. At present it feels a bit like a wet noodle. To heck with comfort, I need more track feel. I would like to stiffen this up with an aluminium post (Thompson).Would an aluminium post compromise the carbon frame, one being rigid and the other with a bit of give. I don't want to crack the frame. I am tall so a 400mm post is out to its limit.
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Answer: 
An aluminium post is fine in a carbon frame (generally) if it is treated correctly with assembly paste to stop and corrosion or galvanization taking place.

Ultimately this question will be best answered (for peace of mind) by the manufacturer who constructed your frame.
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Answer: 
Despite the fact that carbon frames are sold with aluminum seat tubes, I wouldn't recommend this, as I've seen a Stumpjumper HT cracked by a seat tube when weight was suddenly applied to the saddle, creating a lot of stress by a rather heavy rider.

This was a bad maneuver, however, I think that had a carbon seat tube been used, this would have been prevented due to the similar flex of carbon against carbon, compared to the "more rigid" aluminum tube. Worst case, I think the carbo tube would have snapped instead of the frame.

Fortunately, it was under warranty so he got a replacement.
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what size seatpost and clamp size do I need for a giant boulder aluxx 600 please? thank you!
4 months, 3 weeks ago
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Answer: 
The 2013 version of this frame requires a 30.9mm Diameter seatpost:

(see here - http://lnk.nu/chainreactioncycles.c...)

and a clamp size of approx 34.9mm.

As we are not a Giant dealer we cannot be certain on the clamp diameter but logically this is the size the frame would require.
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Age: 55 to 64
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5 months, 2 weeks ago
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Answer: 
Seatposts vary in size depending on specific model and size of bike; the best option is simply to measure the diameter of the existing post.
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Answer: 
Not being a Marin dealer I can't be certain, but the spec listed on BikePedia suggests it takes a 30mm seatpost (http://www.bikepedia.com/quickbike/...). You can double check by measuring the frame/ post as shown below, and or contact your nearest Marin dealer who should be able to double check for you.
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Trek Top Fuel 8 seatpost diameter?

Hi

I've checked on my current seatpost and can't see a stamp, and I've googled but not found the answer. What is the seatpost diameter for a Trek Top Fuel 8? I want to get a dropper post, but need to make sure it's the right one!
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7 months ago
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Answer: 
We aren't a Trek dealer so I can't be 100% sure and I don't know what year model your bike is. However I have checked the Trek archive for the Top Fuel 8 and all of them were 31.6mm 2009-2011
7 months ago
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seat post for a cube ltd team 2012

Hi someones pinched my seat and post anyone know the size of replacement i should get?
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9 months ago
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Answer: 
Fairly certain the 2012 Cube LTD Pro ran a 31.6mm seatpost. You can double check by measuring the internal diameter of your seat tube.
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11 months ago
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Answer: 
Unfortunately this is not a seat post diameter that we stock at present.
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Answer: 
We have many seatposts available in this diameter (27.2mm); which can all be found here -

http://lnk.nu/chainreactioncycles.c...
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What is the material most resistant to scratches and gouges from being moved in and out of the bike frame? (I'm also into super lightweight everything)

thanks.
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Answer: 
As the seat post is clamped into the seat tube, it's almost impossible to avoid clamping marks. Being careful when raising/ lowering the post is the most effective way to avoid scratch marks, but some riders use a smaller seatpost than they require and fit a plastic shim to the seattube to try and help avoid damage. Carbon posts are always an option, and some carbon assembly gel/ paste will help to protect the surface from excessive clamping forces.
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Answer: 
Natural titanium, or any post with a hard anodised or ball burnished finish will likely be harder wearing than a lacquered carbon or painted coating.

Despite this they will still mark over time with repeated height adjustment especially with a dirty or gritty seat tube.

Thomson Elite seatposts have a very good hardwearing finish, but even still you should consider a silver one to minimise the damage to the finish on the outside of the seatpost.

In addition make sure that inside of your seat tube on your frame is kept squeaky clean, even rinsing it with a liberal spraying of your favourite light oil/dispersant from time to time (for example WD40, GT85, STP80 or equivalent). Not too much though, you don’t want it collecting on your BB bearings!

Thomson seatposts are also very light for their strength.

An alternative would be to runner a smaller diameter seatpost and use a plastic shim, but again make sure that the shim is kept clean.

Finaly, consider a dropper seatpost, there are some lighter models out there (for example the KS Lev and FoX DOSS, and even the Thomson Elite dropper).

Depending on length/drop they are lighter than (for example) the RockShox Reverb. Any of these posts, albeit heavier than the Thomson Elite non droping varient can be clamped in the frame and will negate the possibility of the post being marked by your frame when constantly adjusting the saddle height.

I’d recommend getting one with a silver or light coloured stanchion as for example even the black anodising on the Reverb fades over time with repeated saddle height adjustment.

Make sure you use antiseize compund if you intend to clamp a dropper post in your frame for an extended period.
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