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Picked up a set of geomax's for cheap, an mx51 up front and an mx31 for the rear. The tires on my CR 125 are a 80/100-21 front and 100/90-19 rear, these new ones are 90/100-21 front and 110/80-19 rear. How would a wider front tire perform? How would a lower-profile rear tire perform?

It will depend on what your riding on. And different brands of tires will be different sizes so you would need to compare brand for brand as far as the sizes go.

The rear that you got will only be about 2mm shorter, but 10mm wider, than the one you had. Your new front one will be 10mm wider and 10mm taller than your old one.

Tire sizes break down to (width in mm/ aspect ratio, side wall height figured as a percentage of width/ rim diameter) so it could also read 100mm/90%-19"

david wrote:The rear that you got will only be about 2mm shorter, but 10mm wider, than the one you had. Your new front one will be 10mm wider and 10mm taller than your old one.

Tire sizes break down to (width in mm/ aspect ratio, side wall height figured as a percentage of width/ rim diameter) so it could also read 100mm/90%-19"

How would a taller, wider front tire affect handling, if it even will?

May flex more on hard pack. Should be able to take a straight on hit without damage to the tube better.

looks like I will have to mount it and see for myself haha, thanks man