Wr450 19' Rear or stay with 18'

I have a question, I have a 2006 WR450, I was to use it for mostly riding trails with son, But he grew out of trails fast. Now we ride motocross, I need a new rear tire soon, and wondered if anyone know the pros and cons of using a 19' rear wheel. Also would like to know a good motocross tire that hooks up in mud to rocky ground. Also wanted to know what year of YZ exhaust cam do i need.

I have a question, I have a 2006 WR450, I was to use it for mostly riding trails with son, But he grew out of trails fast. Now we ride motocross, I need a new rear tire soon, and wondered if anyone know the pros and cons of using a 19' rear wheel. Also would like to know a good motocross tire that hooks up in mud to rocky ground. Also wanted to know what year of YZ exhaust cam do i need.

Since you ride motorcross, the 19 inch tire would be better. Its lighter and will spin up easier.

I ride desert so I have yet to see any mudd. I don't know of a good tire for that.

I have a question, I have a 2006 WR450, I was to use it for mostly riding trails with son, But he grew out of trails fast. Now we ride motocross, I need a new rear tire soon, and wondered if anyone know the pros and cons of using a 19' rear wheel. Also would like to know a good motocross tire that hooks up in mud to rocky ground. Also wanted to know what year of YZ exhaust cam do i need.

19" tire is the way to go for MX but it will make you ride harsher on rocky terrain.

Look at the Maxxis line of tires, the desert IT is great in rocky conditions and holds up well but it isn't the best with mud, not bad just not great. I personally haven't tried the other two Maxxis IT tires (but I'm going to) but I'd bet that one of them will serve you well.

Why the YZ cam? A lot of easier ways to gain power. I don't know which one since you didn't mention what year WR you have.

If I was trying to make a WR into a MX warrior I would spend my time and effort in supension mods and weight savings instead of in HP gains.

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