@Djinn,
1.Nakuru-Nyahururu - 56 Km.Expect a few tricky potholes between Kenyatta High and Subukia and a couple of unmarked bumps at Igwamiti (Shopping centre right after Laikipia campus).
2..Nyahururu-Nyeri - 103 Kms.Road has been patched except for a few bad areas before and after Ndaragwa town.Beware of construction trucks between Mukinyai and Mweiga.If you are going to Nanyuki,you may take the far much shorter Solio ranch road.It's an all weather road which is not in bad condition.Avoid if it's raining.
3.Nyeri-Nanyuiki - 48 Kms.Nothing takes the wind out of me more than those bends between KWS staff quarters (King'ong'o) and Kiganjo.The rest is tandika ulale.
4.Nanyuki-Timau - Sections of this road are....what did i say?.Some disappeared long time ago.Drive carefully.After Timau,it is fairly good upto Saibuga (Isiolo junction).Turn and enjoy the short tarmack upto Lewa downs gate.From there it's diversions all the way past Rasugu centre.(Beware of Intex construction trucks and machineries).The rest is fair and lonely road..........Nanyuki -Isiolo - 82 Kms
Old man about town....
Nothing great was ever achieved without enthusiasm.