I am pretty pleased that I hit my target 58kg this morning. I am trying to decide if it's a good idea to get down to 56kg as a new target, or keep that extra 2kg if possible to 'use up' on PBP. If In start it at 56 then there really wouldn't me much non-muscle flesh on me to draw on with a calorie deficit. Hmmm.
IME, in doing the training for Mille Cymru last year, losing weight was not a problem. In fact I had to eat shitloads during the week to make up for the weekend's riding.
There are potential issues with very low body fat - have you checked what your body fat % is?
When I stick my measurements into a calculation site I get this:
Body Mass Index: 19.5 kg/m2
Waist-to-Height ratio: 0.43
Percent Body Fat: 17.0%
Lean Body Mass: 106.1 lb
Your weight is in the normal range.
You do not need to lose weight.
Minimum caloric requirements: 1922 Calories per day
Your diet should contain at least 103 grams of protein per day.