26.7 seatpost for Miyata
02-11-08, 05:56 PM
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26.7 seatpost for Miyata
Hello
I'm overhauling a 1981 Miyata 610, which takes a 26.7 seatpost. I have a 26.8 in there now, which looks like it has been chewed by badgers.
Anybody know where you can get a long 26.7?
Thanks
Mike
I'm overhauling a 1981 Miyata 610, which takes a 26.7 seatpost. I have a 26.8 in there now, which looks like it has been chewed by badgers.
Anybody know where you can get a long 26.7?
Thanks
Mike
02-11-08, 06:00 PM
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Sanding down your 26.8 post might be your best bet as it'll take out those scratches and give you a shiny product that fits in the end.
Neal
Neal
02-11-08, 06:01 PM
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I would just start sanding that 26.8 and polish it out. You get a good fit and a pretty part. .1mm is going to take very long just stop every once in a while to check for fit.
edit
uh what he said (beat to the punch)
edit
uh what he said (beat to the punch)
02-11-08, 06:31 PM
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I suspect the 26.8 is the correct seat post, and that the binder bolt has been overtightened at some point. If you can gently manipulate the ears to re-open the top a little bit, the 26.8 post may fit perfectly.
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02-11-08, 07:51 PM
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Some 26.8 posts aren't 26.8 either, i've had at least 2 cheap '26.8' posts that didn't fit. Kalloy posts in 26.8 fit perfectly.
02-11-08, 08:01 PM
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26.8 should be right, my '81 912 has one.
02-11-08, 08:02 PM
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Concur.
I'm working on an '81 710 just now, have a '87 512, '87 Team TT bike, and a '90 Triplecross. All are 26.8.
Top
I'm working on an '81 710 just now, have a '87 512, '87 Team TT bike, and a '90 Triplecross. All are 26.8.
Top
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)
Last edited by top506; 02-12-08 at 01:22 PM.
02-11-08, 08:14 PM
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I too suspect that 26.7 is NOT the correct size. I know it says so on Sheldon Brown's site for the 610, but I'm fairly sure that is a mistake. All other decent Miyatas from that period take a 26.8.
02-11-08, 09:30 PM
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Thanks to you all. I was going on what Sheldon Brown said. I'll give it a try. I couldn't understand how a tenth of a mm could make that much difference.
Mike
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02-12-08, 06:14 AM
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Yes, 26.8mm is correct. Typically, manufacturers only make posts in even, 0.2mm increments.
04-23-10, 11:17 PM
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This is a bit late (2 years) but my recently gotten miyata 610 which is probably 1981'ish, post is 26.7 as Sheldon Brown posted online.
04-23-10, 11:32 PM
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04-24-10, 09:50 AM
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The 81 catalog says it came with a 26.7 nitto.
Here's the link
https://2.bp.blogspot.com/_whtVpXkKwl...0-h/img014.jpg
Here's the link
https://2.bp.blogspot.com/_whtVpXkKwl...0-h/img014.jpg
04-24-10, 11:38 AM
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04-24-10, 09:54 PM
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I just put in a 26.6 Kalloy seat post on my Miyata Ridge Runner and it fit a lot better than the 26.2 I had originally placed. I guess if I too chance upon a 26.7 I'll replace the existing seat post.
04-24-10, 10:10 PM
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Does anyone know much about the sizes of other components? Seatpost is 26.7, headset is bigger than my 32mm wrench, just ordered a 22mm crank puller but not sure if it will fit...
04-24-10, 10:18 PM
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04-24-10, 11:56 PM
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05-08-10, 09:32 PM
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I have a 84 710 and am going through the same situation. I just picked up a longer post from the LBS. They said it took a 27.2. Wrong. I pulled the original post and it was stamped 26.8 on the post clear as day.
08-20-10, 12:14 AM
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First Post-
Just to chime in, I have came across this issue with my 82 Miyata 310. Sheldon Brown's Seatpost reference is indeed accurate. My seatpost actually says it on the side.
Thanks for the advice of upping to a 26.8. It feels good to have options.
Just to chime in, I have came across this issue with my 82 Miyata 310. Sheldon Brown's Seatpost reference is indeed accurate. My seatpost actually says it on the side.
Thanks for the advice of upping to a 26.8. It feels good to have options.
08-20-10, 12:24 AM
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This thread is so esoteric. I love it.
BTW, from my limited experience with a 1986 Team Miyata, I agree that the correct size should be 26.8. That is a very common Japanese size from this period.
BTW, from my limited experience with a 1986 Team Miyata, I agree that the correct size should be 26.8. That is a very common Japanese size from this period.
Last edited by RFC; 08-20-10 at 12:27 AM.
08-20-10, 06:27 AM
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Here's a photo for skeptics who don't believe in 26.7 posts. I replaced the original with a 26.8 Kalloy post after enlarging the seat tube (of the 1981 Miyata 610) a bit with a brake-cylinder hone. Achieving a perfect fit was a ten-minute job with some cuttting oil. I had already stripped the frame, but I imagine that you could readily do it with the bottom bracket in place if you turned the bike upside down in a work stand to keep the gritty cutting oil from running down into the bottom bracket bearings and contaminating them.
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