Originally Posted by
Dave Kirk
Hey Hansen,
Thanks for writing.
The orange bike uses normal OS tubes (1 1/8" top and 1 1/4" down tubes) but the Big Blue Bike (BBB) uses the XL stuff.
Yes it's perfectly acceptable to use a top tube as a seat tube assuming the butt lengths work out properly for both good solid clamping of the seat post and a long enough butt at the BB end. The seat tube in the BBB is 953 and is most often used as a downtube. It has long butts so both ends work out well and it's silly thin in the middle to keep the weight in check. It works very well.
One could use a heavier wall and end up with a more common post size but the tubes are more than strong enough even with the very thin walls so I'm opting to cut down the weight.
What do you think?
Dave
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