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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 10-06-07, 11:34 PM   #1
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Seatpost sizing for Panasonic Sport 1000

I bought my friend and I each a Forte Precision seatpost at Performance today because they were really cheap, and we both wanted new ones anyways. We both have Panasonic Sport 1000's, and I used a caliper to measure the post which came to 26.85mm, so I bought 26.8mm posts. I can't get the new post in! Sheldon Brown wrote that the DX-2000 uses a 26.6mm post but that uses a totally different tubeset. Anyone know what size I need?
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Old 10-06-07, 11:36 PM   #2
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26.6
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Old 10-07-07, 01:02 AM   #3
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26.6
Hmm. Thanks!
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Old 02-01-08, 09:17 AM   #4
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My friend finally got around to installing the 26.6 Kalloy seatpost...except it wouldn't fit. I'm going to try installing it on my bike sometime tonight, but the thing is my friend really needs a new post. Anyone have a clue? They're both Tange 900 tubesets.
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Old 02-01-08, 09:26 AM   #5
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I bought my friend and I each a Forte Precision seatpost at Performance today because they were really cheap, and we both wanted new ones anyways. We both have Panasonic Sport 1000's, and I used a caliper to measure the post which came to 26.85mm, so I bought 26.8mm posts. I can't get the new post in! Sheldon Brown wrote that the DX-2000 uses a 26.6mm post but that uses a totally different tubeset. Anyone know what size I need?
measure the INSIDE OF THE FRAME TUBE with the caliper: make sure you rotate the caliper while holding tension, so you get an accurate measurement (use the inside measurement ears) then release tension, and read the dial/screen.

you can also use these for accurate inside measurements of tubes:
http://www1.mscdirect.com/CGI/NNSRIT...51690&PMT4NO=0

you stick the "T" head down the tube, and tighten the dial, then remove and measure with a caliper, for EXTREMELY accurate inside measurements.
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Old 02-01-08, 09:27 AM   #6
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For what it's worth, my Track 4000 uses 26.6 as well.
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Old 02-01-08, 09:47 AM   #7
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For what it's worth, my Track 4000 uses 26.6 as well.
That uses Tange 1000 right?
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Old 02-01-08, 09:57 AM   #8
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If you measured at the top you wasted your time.
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Old 02-01-08, 11:41 AM   #9
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If you measured at the top you wasted your time.
Top of the post or top of the seat tube? I took out the post and measured an average, all around, 26.85mm.

I'll return back after I try installing the post.
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Old 02-01-08, 01:53 PM   #10
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i can confirm that the DX2000 (tange 900) is 26.6 at some point. mine is similar vintage to igneous' track 4000.
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Old 02-01-08, 02:28 PM   #11
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I'll go check what size my sport 500 and 1000 have...
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Old 02-01-08, 02:36 PM   #12
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I got some weird readings but it appears to be around 26.1

edit: sport 1000 with 1020 tubing
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Old 02-01-08, 03:26 PM   #13
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Top of the post or top of the seat tube? I took out the post and measured an average, all around, 26.85mm.

I'll return back after I try installing the post.
Im sorry.
I thought you measure the top of the seat tube.
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Old 02-01-08, 04:13 PM   #14
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Track 4000 uses Tange 2.
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Old 02-02-08, 02:17 AM   #15
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hammer.
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Old 02-02-08, 08:03 AM   #16
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I just used my dial caliper...seems like the original seatpost is closer to 26 than 26.6. Oh well. I wonder why I originally measured 26.85...I used a digital caliper then!
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Old 02-02-08, 10:11 AM   #17
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hammer.
Worst advice i've ever seeen.

http://www.sheldonbrown.com/stuck-seatposts.html

Last edited by operator; 02-02-08 at 10:32 AM.
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Old 02-02-08, 11:01 AM   #18
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Tubeset model isn't necessarily going to determine SP size.

Step 1: Take bike to shop.
Step 2: Ask them to measure it using a SP gauge (Devo hat looking thing, pic somewhere on Sheldon) or by just trying cheap posts.
Step 3: Buy the size you actually need.

To do it with calipers you really have to measure all the way down as far as they will reach, even then it's better to just do it right.
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