Tandem Cycling - Size of RT1000 Stoker Stem Seat Post Clamp?

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mwandaw
10-07-12, 11:03 AM
I have an OEM 1999 Cannondale RT1000 stoker stem. The seat post clamp uses a shim to fit the 27.2 mm captain's seat post. The surface of that shim is scratched, so I cannot read the OD size of the shim. (See the photo.)

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Can anyone tell me the OD size of the shim? I have tried to measure it, but it could be a few common sizes, depending on how hard I squeeze the shim together.

Thanks!

PMK
10-07-12, 01:59 PM
Very accurately measure the wall thickness. Multiply times 2 and add that to 27.2.

Odd thing though, I was unaware that any Cannondales of that era used a shim to achieve 27.2.

FWIW, the best seatube shims I have found for 27.2 are the Thudbuster manufactured parts. Far better quality than Problem Solvers brand on account of being longer and anodized.

PK
mwandaw
10-07-12, 03:26 PM
Very accurately measure the wall thickness. Multiply times 2 and add that to 27.2.

Great tip... thanks!

Here's a picture of the stoker stem.

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It's so nicely made that it's actually a pleasure to look at or to hold!