91 Team Marin...all road tourer?!

I've had good results using carbon assembly paste but it does get less grippy over time as they disintegrate. (The microbeads)

Sanding the shim might do the trick though, I tend to stay away from shims for this particular reason.
 
🤣...think that's all three of us at the same time!

Yes...i hate the shim idea too, but until i can find a 30.3 post im a bit stuck. I am considering getting a 30.4 and shoving it in the lathe. Tbh, it may even go in given the corrosion down the tube over time...
 
So, after fiddling about, including, but not limited to.....copperslip, abrading the shim inside, a different bolt and a few layers of alluminium foil tape round the shim for good measure....no dice.😕.

Still slips when i simulate a bumpy road in the garage....may regret that later..🤔

I've measured the internal of the post as far as i can go with big verniers and it looks like its 30.4 one way and 30.5 the other. Its supposed to be 30.3. However, with the foil and the shim being 30.4 to start with im doubting its that.

Also measured the post is 27.21 so pretty spot on.

All i can put it down to is the interaction of the shim and the post..... and the shi and the frame. There's just too many things trying to crush up to get a good tight clamp.

So im going to order a 30.4 seatpost. It won't be as nice, but i agree with @Imlach , its no use having a post that's barely hanging on in there....especially on long trips.

Im also going to buy a small set of bore gauges as they would ne ideal for this type of thing. Got bigger for engine builds, but nothing that small.

Watch this space.
 
So, i got a bore gauge. I was going to buy the same as I use for engineering stuff, but they are now £62 each! Plus its a size im never going to use for anything serious.

So, i bought a £10 set off Ebay...im pleasantly surprised. They are pretty good. The advantage over calipers is that you can go in 4 or 5" even with the short ones. It avoids the top bit which gets deformed with tightening.

The tube is slightly ovalised...about 30.48 one way and 30.6 the other. Its also a bit up and down due to rust removal inside.

Im going to 30.4 post. Thats 0.1 mm bigger than standard..but you cant get 30.3 and 30.2 will be worse i fear!

Its not going to be anything flash, ergotec, but I would rather a reliable set up than flash and failing.
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my goodness, this subforum has an amazing obsession with Team Marins. I have one as well, but it is not anywhere rebuilt up as lovely as any of yours
 
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