I am looking at Dahon Spped 7 and Mariners now. My question is Dahon syas the D7 folds to 13X25x32 and Mariner to 12.5x26x29.5. Thw crucial number is the 29.5 as it allow fitting in an airline sized suitcase. Does asnyone know if these are true measurements? I've looked at the folded pics and I can't see how the Mariner is 2.5" less.