Can I put larger tires for mountain biking on my bike?

The max tire size you can add is a 16/20/24 x 1.9 in, if it's any bigger it will rub against the brake cables. We're using shorter brake arms on our bikes so that we can use a lever that's easier for your child to reach, so there isn't a lot of space to change tire size. 

Here are the tire sizes for all of our bikes: 

AIROS Series 

16 inch = 16 x 1.75 in 

20 inch small = 20 x 1.75 in 

20 inch large = 20 x 1.75 in 

24 inch = 24 x 1.75 in 

ETHOS Series 

16 inch = 16 x 1.50 in 

20 inch small = 20 x 1.50 in 

20 inch large = 20 x 1.50 in 

24 inch = 24 x 1.50 in 

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