Metal Gearmotor, Pololu Wheel 90x10mm, universal mount help

Need help with mounting a pair of Pololu Wheels( 90x10mm ) on a 9.7:1 Metal Gearmotor 25Dx48L mm, with universal mount.

I have ordered the parts below, but I didn’t realize that the motor had a 4mm shaft and the universal mount was for a 6mm shaft.
Is there any easy way to get these wheels onto this motor?


thanks in advance!

Perhaps you could exchange the 6mm-shaft mount for the 4mm-shaft mount.

I also have a 4mm universal mount, but the wheels don’t fit this mount. The holes don’t seem to match up between the mount and the wheels.
Am i doing something wrong?


Note that only two of the holes will line up between that adapter and that wheel.

- Ben