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Do you have any information on the "sticking out axles" such as the diameter and if it has a flat sot for a set screw. that would be the more important information for picking a gearbox other than the RPM output and the desired RPM and torque...

Dimensions of axes (length x diameter) 9x3,2 mm and 14x3,2mm

operates from 1,5V to 12VWith 12V rpm is approximately 18.000 rpm[...]If someone can recommend me a gearing system I can use, I would be very grateful

I am horrible at mechanics and constructing things with gears and stuff, so I am willing to buy new motors for about €15 per motor.I am indeed planning to participate at the Dutch Championships Robocup playing 1vs1 soccer I am using the following omniwheels with a diameter of 50mm:

For the rpm needed:I measured the diameter of the wheel which is 5 cm, so the perimeter is about 16cm (hard to tell exactly as the wheel is not perfectly round). So when needing it to run at 100cm per second, it needs to run 100/16 a bit more than 6 rps, which makes a desired rpm of approximately 375 rpm. Which gear motors correspond with these needs?

I almost made my decision, I made a list of 3 motors which I think will do the job. I adjusted my needs a little bit, I think 0,5 m/s will be sufficient.So my list contains these three:http://shop.conrad-uk.com/hobbies/modelling/modelling-engines/modelling-gears/model-built-driving-engines/227552.htmlhttp://shop.conrad-uk.com/hobbies/modelling/modelling-engines/modelling-gears/model-built-driving-engines/227544.htmlSo these two are the same except for the gear ratio, and for the last one:http://bit.ly/hJeBSnThis one is a tad more expensive and also has a gear ratio of 1:30.Which one do you recommend?Thanks a lot for your help!!!