(I'm not a bicycle mechanic. Please excuse the incorrect terminology.)
I would like to have an internal hub gear (Shimano Alfine 11) installed on my bicycle. My bicycle has a horizontal rearward-facing track fork end.
Situation 1: no chain tensioner
I was told that to keep the chain tense the rear wheel needs to be pull backwards and then the lock nuts tightened.
I am concerned that on a steep uphill the rear wheel will shift forward, e.g. if I have a bad puncture and I need to replace the tube, then I need to make sure to tighten the lock nuts to prevent the wheel shifting forwards. Question: Is my concern valid or will the wheel never shift?
Assuming the chain is worn out and starts slipping and there is no new chain available. I could re-tense the chain by loosing the lock nuts and shifting the wheel back to tense the chain. Question: Is this correct?
Situation 2: with a chain tensioner
In this case, I could install the rear wheel right against the front of the fork end. The chain tensioner takes care of the tension. Question: Is this correct ?
Assume the chain is worn out and is slipping and there is no new chain. Question Can I adjust the chain tensioner to increase the tension on the chain, i.e. does the chain tensioner only "have one tension" or is it possible to adjust the tension of the chain tensioner?