I recently purchased a large GT Ruckus frameset, which is still in transit (10 to 15 business day shipping, yikes). The guy I purchased it from did not know the exact size of the seat post, he just new it was 30 something. I have a thudbuster 27.2 which I want to shim to fit the new frame. So the question is, what size seat post does a large GT Ruckus frame use? Normally I would just wait till the frame arrived and then measure it, but I want to minimize my down time buy purchasing the shim ahead of the frames arrival.