>>2006997sure
>>2006958There should not be a any risk of your chain slipping.
Deraileur systems have a tensioner and the tensioner takes up all the slack in the chain. If said tensioner is in working order, deraileurs adjusted correctly and your cogs and chainwheel have life left in them there should be no slipping.
I dont know what it's worth to make hypothetical arguments since the chance is virtually zero. But You could argue that:
The chain can break on both bikes equally likely (inb4 stupidly thick link plates ).
The chain will slip on worn cogs or chainwheels on both bikes equally likely.
If the wheel moves forward it's bad news for the single speed (inb4 tensioners for ss exist).
Being fixed but loose lockring, slightly undo the cog during a skid, faceplant next sprint because it suddenly threads back on.
Most hypothetical issues affect only the deraileur bike:
Indexed gear not engaged right / friction shifter adjusted bad.
Tensioner failing, perhaps when going over a bump.
Something interfering with the deraileur cable.
Chainline being excessively offset, like smallest chainwheel on a road tripple and smallest cog.
Deraileurs set up wrong.
Chain suck.
etc. etc.
I wont let any of them count as they are maintainance or user error and as noted: Hypothetically its more likely for the derailleur if you add up the chances for individual possibilities but such thing should not happen, the chance is and remains as good as zero for both bikes.
