fork tube size help

[bad news]

i want to try a diffent fork i was wondering how to tell what size of fork i can i have a stretched macargi frame and the tube is pretty skinny and long so if theres a help i can get thanks

 

[user 135]

I assume the head tubes only accept 1" steer tubes as they use a springer fork on some of their bikes.

 

[fast eddie]

measuer the outside diameter of the steer tube, it will probably be 1 inch or 1 1/8 inch, there isnt any ryme or reason to which size goes where. but it determines what size stem and headset you'll need. i have a lowrider i bough online, its a schwinn krate style imitation with a 1 1/8 inch steer tube and the front bent springer fork is for a full size 26" bike, if i'd have know that i woulda put that front end on a bigger bike along time ago!!
fast eddie outty