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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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    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 620 (nee 600)____ 85 Gianni Motta
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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
    78 Raleigh Professional_____ 80 Ranson_____________ 80 unknown French (SS)
    82 Peugeot PXN10_________83 Trek 620 (nee 600)____ 85 Gianni Motta
    85 Trek 560______________88 Guerciotti GLX
    90 Miele Gara_____________02 Casati Dardo (g/blue)__02 Casati Dardo (y/blk)
    03 Casati Dardo___________08 BF IRO (fixed)________10 Vassago Fisticuff (IGH)

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