having a hard time finding 18/7-8 & 18/9-8 tires for my sons Viper 90. Is Maxxis really the only option for those sizes out there?

 

Would 19" outside dia tyres fit under the wheelarches, there should be a lot more suppliers of them.

 

There's plenty of clearance on the fenders but I thought that if you changed tire sizes on ATVs it can cause problems. Honestly I'm not a tire guy or really an ATV guy. We just got wheelers this year so I have no idea. I talked with a local tire salesman that had said changing tire sizes on a small wheeler like the Viper might be a bad idea. Any info that anyone can share on that would be great because like I said...the tire sizes that came with the ETON 90 are def not widely available.

 

19" is 1" bigger, so half an inch more ground clearance and the bike would move 3" per rev of the wheel further, raising the gearing so little I bet you wouldn't notice it.