ok I want to convert my 24" 2005 specialized Hotrock to a rigid ss
I still have a few questions though...
like would this fit
https://www.ediscountbike.com/Shop/Co...49232245242241
on this
https://www.specialized.com/us/en/bc/...1&menuItemId=0
And this i just remove my freewheel and put this one on?
FMF Powermoto Dicta BMX Racing Freewheel 14t Chrome New
And would this work for my bike?
https://cgi.ebay.com/KORE-CHAIN-REACT...mQQptZCycling_

These are what wheels look like

I made that in paint...

So what that means is if you put a single speed free wheel on there, your chain line will be off. Which will result in

1. your chain bucking off
2. friction that will make your bike very unificent

That being said, options you have include

1. setting the index point of your derailer to a larger cog of your freewheel, forgetting about cables etc.
2. buy a 24 inch single speed wheel
3. go to a thrift store, pick up a junk little kids mountain bike, and learn how to
a. remove freewheels
b. reset spacers
c. dish wheels (and truing them)

That would cost you about 10-15 dollars, which is basically what people throw away on fast food.

Looked at the specifications on both sites for the fork.

your bike a 1 1/8'' fork/headset, the fork is 1''.

Another factor is rake, thats a bmx specific fork, geometries will probally be different on bmx/mountain bikes.