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I dont beleive he has his sizing right. from the bottom bracket to the top of the seatube, klein did a 18.2 which is classed as a Large not a Medium. The Medium is 17.5 centre to top.
Don't know for sure about modern trek kleins but vintage kleins are measured by drawing a vertical line through the bb (when built obviously) to where this line intersects with the top tube. Could this explain the sizing?
OK I will measure up the rest of the frame tonight which should hopefully put this one to bed. I could be wrong its not the first time at which point I will doth my cap to those with superior knowledge in these matters
GT- Steve is going to take it with the Marzo Marathons as well. So at least its staying in the family.
On a side note re the size I am due to show my backside in Burton’s window this weekend as it’s a large as advised by my learned colleagues further up the post