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I got a 26.4 seatpost, but the seat tube is a 26.2. make any difference
Depends if your frame likes bigger posts or not, is it dirty? 😉
Not at all. It's a con that the right size is needed and you should just go for it.
Let us know how it turns out.
A bit of grease should do it
Well, it'll be fine so long as it actually goes in... the theoretical sizes mean it won't happen, though I usually find seat posts are tye right size, but seat tubes are usually oversize.
I have used a seatpost one size too big - but given the choice I wouldn't recommend it.
A certain well known and much maligned national bike shop chain measured my frame wrongly when I went in for a new seat post.
