Old Shimano 105 double on a 107-110 UN55 is a budget option, proper chain tension and non ramped chainring will usually keep the chain on as well.
That combo would make the cranks hit the chainstays. Even 113mm which is standard for vintage 105 leaves only a few mm between cranks and chainstays on MTBs.
@kifla started
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Old Shimano 105 double on a 107-110 UN55 is a budget option, proper chain tension and non ramped chainring will usually keep the chain on as well.