Originally Posted by
gauvins

My situation.
I am 5'11" + and ride a 54cm LHT frame. With a Thudbuster.
As several people mentioned, a smallish frame can be extended somewhat with the seat post and headset spacers. More difficult to adjust a largish frame...
Not really, a shorter stem if necessary, but I use the stock length stem on a 56 LHT, and I am 5'10.5". The nice thing about the larger frame is I don't have to use a huge stack of spacers to get the bars level with the saddle. A 56, or 54 will work fine, the only real difference will be what has already been mentioned, the 54 will give more room for a Thudbuster type seat post.