Pity it's for a DS, I have a pink one that my DD has out grown. It is alot lighter than the bikes you would get from halfords, argos etc. It has a front brake on handles but also a back pedal brake which is really easy for them to get the hang of, they just pedal backwards and the brake is applied.
My DD was 3 when we got it for her and she has just moved onto her brothers hotrock 16". She is 4.10 and i would say she has been too big for it for a few months but she is quite tall for her age, 110cm.
We didn't get a 12" for DS, he went straight onto the 16" when he was 4, although he is tall too.
One advantage with the lightness of it is that we were able to remove the pedals and DD could use it as a run bike then she went straight onto no stabilisers (she had a proper run bike before the hotrock though)
poachedeggs - just seen your ds on the list! ds2 is a bit unsure about doing it because he knows he won't win... I won't be taking ds3's pedal bike tomorrow because it is too much for me having to be there to start him off and catch him! I will put a vid on fb soon
That is good to hear it is light. He is riding an ancient thing at the moment and it is so heavy I have to push him up slight inclines hills. Shame yours is pink, with 2 big brothers I don't think he could get away with it!
Ds1 had one, fantastic, light bike. We got it for his 4th birthday (he is pretty small for his age) and he rode it immediately without stabilisers (balance bike previously). The back pedal brake makes it very easy for them to get the hang of pedalling, lots of kids pedal halfway round and stop IYSWIM. That can't happen with the Specialized.
That is good about the pedalling because his current bike is like that too and I really think it helps him pedal.
Ds is 83cm tall. His current bike is 43 cm from ground to top of saddle and 34ish from pedal at lowest point to saddle and he manages on that except starting and stopping because he obviously can't touch the ground! It sounds like the Hotrock is a wee bit smaller so that is good