Justock, Hobbywing
 

Anyone used these??

http://www.giantcod.co.uk/justock-club-p-405302.html

Write ups seem ok on the website..............

Its going to go in a 4wd on 13.5 boosted up a bit.

Or am I better going for a Xtreme stock or 60a hobbywing?

You need the 60a ... the justock can't use boost software.
The 60a is a great speedo for the money but not the smallest .. should fit in most 4wd though.
Extreme stock would also work and is a little smaller.

Thanks mate, yes after having a good read up on it noticed this about zero timing.

Gone and ordered a Xtreme stock 60a, got one already and its been really good.

the xtreme stock is a good speedo,but a word to the wise I found out to my expense they do come a part in two half's in a crash,and sometimes stop working/short out. You can fix this by taping the two half's together or four drops of supper glue to the four tab's that hold the speedo together.