Tubemore

Hello!

I own a Koga Miyata Traveler from the year 2000. It's on page 36 of the 2000-brochure, I tried to add an image but this forum won't let me do that.

Can anyone tell me the exact diameter that a fitting seatpost needs to have for this frame? Or can someone point out how I can find out? Maybe it's somewhere on the frame?

Thanks!

P!N20

You could buy one of these:

PhilFo 

Most Miyata take a 26.8mm post, with the exception of very early-80s 610s, which used a 26.7mm. I have one of these.
https://www.sheldonbrown.com/seatpost-sizes.html

non-fixie 

This is the bike, I believe. Oversized aluminum. I wouldn't bet on it taking a 26.8 diameter seat post. 27.2 or even 31.6 seems more likely. I'd take it to the nearest LBS and ask them to check.

Tubemore

Thank you for the replies. I didn't know such tools actually exist. Are they very reliable?

My guess was indeed that it is 26.8, which kind of sucks because I would like to install a Thudbuster seatpost and the newest (G4) version starts at 27.2. The G3 does exist at 26.8 but I can't find it anywhere anymore. There is a 25.4 G3 version available that I could install with a shim, but that's not ideal and that costs 50 Euro's more than the newest generation, which isn't cheap to begin with.

@non-fixie, how would a bikeshop check what size it is? That is indeed the correct bicycle.

If any of you have good experience with a similar seatpost to the Thudbuster (elastomer variant) that does come in 26.8 I would love to hear.

PhilFo 

Every bike shop should be able to accurately measure your seatpost to within .2mm. Literally every one. If you want to do it yourself, get a set of vernier calipers, learn how to read them and go forth.

non-fixie 

I would expect them to either use an appropriate tool, like mentioned above, and/or have a box of seatposts in different sizes available to test fit.

Tubemore

As a follow up question; I do believe there is currently a 350mm length seatpost in the bicyle. The Thudbuster is however 400mm. Would this fit or should I measure this first to make sure? And if so can I do this at home?

PhilFo 

Do not buy a 26.8mm post without having your seatpost measured. When I replied, I made the mistake of assuming the bike was steel. As it is aluminum, it is almost guaranteed to have a different size post. Measure the post diameter first, then worry about other questions after.

Tubemore

I would prefer to tackle all at the same time. That saves me time.

PhilFo 

Getting the wrong size seatpost will not save time. You can purchase a set of digital, dial, or vernier calipers and get an accurate measurement yourself.