Thanks everyone for being on this journey with me. It has become very evident that it makes no sense to spend hundreds of dollars doing a fork swap to get a longer 1” (already becoming obsolete) threadless steertube for a bike that probably has never fit me correctly to begin with.

LarDasse74 makes a good point; I really do not have starting point by which to judge the size needed in my next frameset. Though I’ve thought about shelling out the money to be professionally sized up, but I know that I’ll pay a premium to get measured by a shop and then buy somewhere else (because no LBS can/will touch on-line prices). With the Surley LHT being the only affordable touring frameset sold to the public (please correct me if you feel that I am wrong in this conclusion), I am not sure cost to benefit analysis of fitting makes sense at this stage in the game. Considering how much standover height clearance I have on my 21" 520, the 56cm is the largest Surley LHT that I dare try. The standover height difference between the 21” 520 and 56cm LHT is 1.8” which is really pushing it for me to be able to stand flatfooted over the top tube.

In building up a new 56cm LHT with all of my current components (many of which are within a year or two old), here are my findings:

LHT 520
Seat Tube Length 55.9 53.3
Top Tube Length 56.4 56.5
Head Tube Angle 72.0 71.0
Seat Tube Angle 73.0 73.5
Chainstay Length 46.0 45.0
Wheelbase 105.7 105.4
Standover Height 81.3 76.8
Fork Rake 4.6 5.2
Seatpost Diameter 2.7 2.5
Seatube Diameter 2.9 3.2
Stem Diameter 2.9 2.8
Rear Dropout 1.35 1.35
Bottom Bracket Shell Width 6.8 ?

I’m getting weird measurement differences on the front derailleur clamp/seatube diameter and seatpost diameter with my calipers. I’m not sure if my existing seatube and front derailleur will work on the LHT. Does anything here jump out at anyone with frame geometry experience as far as anything that might make me an unhappy with the 56cm LHT frameset? Thanks!