I’m trying to find out what size the bearings are on my old 24" track monster. I got this thing when it went on clearance sale early in 2011. Doesn’t even have brake mounts. Uses a seat tube spacer, 160mm cranks, had a street seat with it. Reinforced hub, other than that I don’t know anything else about it. Having trouble finding anywhere with information on this older model.
Here’s some old photos of what it looked like before I had my way with it (second set of pictures) The red trimmed seat on the 20" was originally on the track monster.
if the cranks are cotterless the bearing will be 40mm. If it is isis or splined the bearings will be 42mm - this is due to the fact that the isis axle is actually wider than the cotterless axle requiring thicker bearings.
The cranks look like they are isis but i cannot be sure