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I'm sure you could, but I don't really think that is what the Z125 is for. If that is how you envision using the bike, there may be another brand that is better suited to you.
Definitely not built for off-road use but doable to some extent of course. I much rather spend that cash on a dirt bike, but that's just because I have a truck to haul it around.
Those that are limited may want to go the route the guy did in that video.
 

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Aren't there dirt bike options that aren't much more expensive? That seems like the smarter option here if you plan to go dirt biking all the time. If it is just every once in a while then you can make it work.
 

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You can always buy used and I can't imagine the majority of Z125 owners or anyone in this segment has much experience off road nor wants to spend much to take a bike through that, buying used saved you a TON.
 

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Nice! Will anything need to be changed to compensate for the larger tires?
To use the Maxxis tires you'd use their 120/70-12 tire on both front and rear (they're not position-specific, so no issues there). Maxxis doesn't currently make a 100/90-12 tire in the M6024's.

Going up in size to the 120 on the front would have minimal effect, the differences in dimensions are small except for width. The 120 is about 3/4" inch (20mm) wider. Once you have your Z, just make sure that there is at least 20mm extra room between the forks on each side of the stock tire for clearance. You'd only need 10mm (1/2 the total 20mm extra width) extra clearance on each side to fit the new tire (it would touch the forks if that was all the room there was) so 20mm on each side is better and would give you a buffer since the tire gets wider when it flexes, particularly over bumps. That way it wouldn't rub on the forks when flexing.

Here are charts showing differences between the two front tires:

https://www.tacomaworld.com/tirecalc?tires=100-90r12-120-70r12

You can ignore the speedometer reading difference chart since you wouldn't be changing the rear tire size. Speedo would read same as with stock tires, which is usually about 7-10% high compared to actual speed. You can use your smartphone and a speed app to find actual speed on the road.
 
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