hello,
I am converting an old road bicycle i have to a single speed. FYI i know this is probally a dumb question but i am a novice mechanic and a noob to SS. so heres the dilema:
i am confused what the need for a chain tensioner is. can i not just shorten the chain to the correct length with my chain tool?
I know i am probally wrong but this question has been bugging me for a while.
I can provide any info on the bicycle as needed.

any help would be appreciated and thank you all in advance.