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Old 02-27-12, 11:17 PM   #1
msmith0957
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25.8 mm Seatpost

I'm doing a rebuild of a beat up 1994 Diamondback Sorrento. I plan on keeping most of the original parts (levers, shifters, derailluer, etc) but when I purchased the bike it was missing a seatpost

I've done some searching online for 25.8 mm posts, but all I find are cheap Kalloy posts, which I've heard some very negative things about. I find the occasional vintage post for sale on ebay selling for $40+, but would prefer to buy it for ~20 if possible. I want to build a solid commuter bike, but I don't care about having fancy/light components. I want something dependable.

Anyone have recommendations? Should I consider post shims, or even buying a slightly larger post, and having it reduced/tapered?

Update: I did find another post on Amazon that seems OK. It's a Promax (who?) 25.8mm post. I'm going to call the LBS tomorrow to see if they have anything I can use, otherwise, I may go with this one.

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Old 02-28-12, 12:23 AM   #2
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Either of the posts you referenced will work just fine. Not sure where you're reading the negative Kalloy posts; all three reviews on your amazon link were 5/5 stars. Go with whatever the LBS has in 25.8. Don't bother shimming and definitely don't go removing material.
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Old 02-28-12, 06:40 AM   #3
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msmith: Either of the posts you referenced will do fine unless having exotic material or an upscale name is more important to you than functionality. This is not rocket science. Enjoy your ride.
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Old 02-28-12, 08:45 AM   #4
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25.8? are sure about the size that seem small more like what an older french bike would have.

Other than an occasional broken bole I have never seen alot of trouble with Kalloy post.
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Old 02-28-12, 09:08 AM   #5
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So what's wrong with Kalloy posts? 245lb clyde here, using 'em on most of my bikes with no issues.
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Old 02-28-12, 10:07 AM   #6
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Try a 1" at 25.4.. it should be a loose fit , the extra ID is .2 mm radius, less, since its .4mm diameter.

then you will know the 25.8 is right.

Want a top premium quality post ? USE .. they make a 25.0mm, and machined in .2mm steps, shims,
for all sizes up to 27.2..
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Old 02-28-12, 10:31 AM   #7
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I don't understand your problem. You need a 25.8 post, and can have a Kalloy within your budget, though it may be a bit heavier than you like. (Otherwise Kalloy posts are fine). Or you can have nicer vintage posts for more money, but don't want to spend that much.

Are you here looking for a contribution to your "I want a nicer post for less" fund?

Seriously, shimming won't do you any good because you'll still be looking at a nice vs cheap dilemma except for 2nd class shimmed fit.

Make a decision between the Kalloy, or shelling out for the post you want, or don't ride the bike while you wait for a miracle buy of a nicer post at a bargain basement price.
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Old 02-28-12, 11:38 AM   #8
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That picture does no justice for the Kalloy seatpost. I've got one and it's really nice quality.
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Old 02-28-12, 03:35 PM   #9
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a 28.6mm 9/8"OD seat tube with a 25.8 mm ID seat post is already a rather thick wall
tube set, so I would not sweat the thicker wall of the lower cost seat post.
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Old 02-28-12, 07:05 PM   #10
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If you are good with stencils, you might want to print out big letters "Cris Keeng" or something like that on some nice inkjet paper, then take an Xacto blade and cut out the letters, wrap that around your post, and use white spray paint on the Kalloy. Then you've turned a regular black seat post into "bling." :-)
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Old 02-29-12, 09:08 AM   #11
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The Kalloys perfectly adequate posts, but I think they are rather clunky looking and they don't micro-adjust.

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Old 02-29-12, 09:20 AM   #12
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Quote:
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The Kalloys perfectly adequate posts, but I think they are rather clunky looking and they don't micro-adjust.
Kalloy do lots of different designs, just google image search for them.
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Old 02-29-12, 09:33 AM   #13
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The 25.8 kalloy post I have is perfectly fine. I'd say it's better than the old supercheap 2 piece post I have laying around somewhere that I replaced with the kalloy.
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Old 02-29-12, 10:48 AM   #14
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Kalloy posts are actually nice, IMO, plus they come in every size! Probably equivalent or better than the original post that came on a Diamondback Sorrento.
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Old 02-29-12, 07:55 PM   #15
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enter "seat post 25.8" in ebay and you find seat posts from uno, campagnolo, kalin, sunlite, zeus, raleigh, sakae and no names
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Old 02-29-12, 11:22 PM   #16
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Wow, I see my post got a lot more attention than I expected.

I'm new to the bike scene, so there's a still a lot for me to learn. Purpose of my question was to gain a little bit of information, to avoid ending up with something I would later regret. From the comments above, I ended up going with a Kalloy Uno from ebay.

The only negative feedback I heard (on another forum) was that the bolts on some of these posts are cheap, and unsafe. I read that one rider had his bolt break in half on two separate occasions from a Kalloy post, the second time seriously injuring himself. I'll be riding this bike in the city; crazy and congested traffic is not uncommon. I don't even want to think about a crash!

I don't care about flash, if anything, I'd prefer my bike go unnoticed. Bike thefts are common here in Philly. I'm just looking for something that 'works' and I think the Uno will do me justice.

Oh and.. regarding dimensions, I'm confident in it being a 25.8mm. All I knew originally was that it is a mid-90s DB Sorrento. After a little research, I found a seatpost database showing a few 1990s Sorrentos (who woulda thought). I still wasn't sure of the year, but after taking a caliper (accurate to .001 of an inch) to the bike frame, was able to measure just about 25.8mm. Therefore.. I think it's safe to say its a 1994 Sorrento

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Old 02-29-12, 11:35 PM   #17
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Quote:
Originally Posted by msmith0957 View Post
Wow, I see my post got a lot more attention than I expected.


The only negative feedback I heard (on another forum) was that the bolts on some of these posts are cheap, and unsafe.

This is a drawback of this post's single bolt design. It's entirely dependent on the one bolt with no secondary system to keep the saddle on if the bolt fails. However the bolts usually don't fail when riding, but when initially tightening as you clamp the post.

As far as I know, Kalloy doesn't use a high grade Chrome-moly bolt, so that's the one upgrade you might want to consider. Replace the bolt with a Chrome-Moly cap screw of the same thread (obviously) and you'll have a decent, safe seatpost.
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Old 03-01-12, 11:03 AM   #18
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Check your local hardware store (not a big chain store), which should have millions of individual bolts in all sizes, specs, and grades.
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Old 04-18-12, 12:12 AM   #19
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The post and seat :)

So.. it's been over a month since I came online asking about seat posts. I thought I'd post a few pics of the bike thus far.
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File Type: jpg 2012-04-18_01-33-40_177.jpg (97.1 KB, 37 views)
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