We know you are trying Manuel.
very trying!
you are almost there. the point is that the torque or power is at a specific rpm.
Engines - big diesels, big V8 pushrod motors - that make LOADS of torque at low rpm aren't nessecarily overly powerful
Take a ADE Air-cooled motor - I like those using those for big slow moving stuff. 350N.m at 1500rpm. thats serious. but it's only 54kW. Max power is 75kW at something like 2500rpm - which means it's only making 280Nm and by 3000rpm it's just moving air, no torque (hence no power at all)
because I'm only interested in Torque at low rpm it's the perfect motor for the application.
I COULD find a 750cc bike engine that ALSO makes 75kW. but it makes it at 12000rpm. - 60N.m
now, in theory, if I put in another 8:1 reduction gearbox I'd have 480Nm at 1500rpm - better than the ADE motor but we all know it's going to be undrivable because it's all throttle and revvy, the flywheel is too small to even let the clutch up without stalling, it's going to overheat, etc . but yes , it will do (theoretically) the same job.
Same goes for a bike. the 75kW diesel motor will theoretically give it tha same performance if you gear it all up properly , but it's kinda heavy and not very responsive.
think of it as gym bunny unpacking a box to put on a shelf 1 item at a time (bending frequently at the hips in yoga pants obviously) vs Muscle head picking up the whole box and shoving it on the shelf. the same job is done - the items are one the shelf - it's just depends on how you want the job done.
that is why power and torque are both quoted and quoted at an rpm. it gives you a good idea of the characteristics of the motor.