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  1. #1
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    30.9 seat post in 31.6 seat tube

    Title says it all I think. I have a 30.9 seat post and a frame that takes a 31.6. Does that 0.7mm matter? I dont see as anyone making a shim that small... does it hurt anything to just crank down the collar a little more? Should I cut a strip of aluminum flashing and stick it in there? couple wraps of tin foil? Im thinking as I type so I may be spurting stupid ideas. But any and all opinions are welcome.

  2. #2
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    It does matter, a lot. Don't do it. Don't shim it either. Buy a new post.

  3. #3
    slow as I ever was Ex Pres's Avatar
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    0.7mm is huge. Heck, 0.2mm kept my seatpost slipping down and made me crazy. I have used a shim before on a really odd sized Mongoose (30.2mm IIRC-something I could only find in a Colnago post). It worked, but I won't say it was an ideal fix. If you can find a 31.6, buy or swap for the correct post.
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  4. #4
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    I was afraid you guys were going to say that. I might have to give up my nice Thompson post for a cheaper one... Cant afford to replace that thing at the moment.

  5. #5
    slow as I ever was Ex Pres's Avatar
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    Quote Originally Posted by qr409tz8 View Post
    I was afraid you guys were going to say that. I might have to give up my nice Thompson post for a cheaper one... Cant afford to replace that thing at the moment.
    Put it on the for trade threads in the other subforums. you never know. you might get to swap for only the cost of shipping
    72 special CNC ______ 72 Frejus (ala Legnano) _73 Holdsworth Record
    80 Ranson__________ 80 unknown French____ 83 Trek 600 (620 styled)
    85 Gianni Motta_____ 90 Miele Gara ________ 02 Casati Dardo #1
    02 Casati Dardo #2 __ 03 Casati Dardo ______ 08 BF IRO (fixed/SS)
    09 Dogma FPX magn_ 10 Vassago Fisticuff (IGH)

    For Sale: _________ 78 Raleigh Professional __ 82 Peugeot PXN10
    85 Trek 560_______ 88 Guerciotti GLX

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