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Enter changeable wheels

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I'm clueless but some research might provide the answer.  Look up the part description for the bearings in both wheels.

The x has a 25mm rear axle and a 20mm front.

The bearings are

front  6904

rear  6905


Those numbers are in the part description; in these bearings the the last digit times 5 is the bearing ID so 4 indicates a 20mm ID, and 5 indicates 25mm.


Do the same for the 250M.


The 6904 bearings have a 37mm OD and the 6905 have a 42mm OD,  worth knowing because sometimes wheel swaps with incompatible axle sizes can be done by swapping in different bearings. More info by web searching Metric Bearing Sizes.

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