[Dirt Runner]

witch is better 18"s or 20" on rear tires. 300ex i need speed and best for trails/race track plus putting razor no it.

 

[mud99]

I would say 20's for the trails for the clearance.

 

[Billy250X]

I agree^^^^!!!20's are better.

 

[aja72]

20" is best suitable for 300ex because it is helpful for lowering your gearing. low end power will be greater.

 

[TRX2fiveO]

the smaller the tire the less topend your going to have I run 20 X 11-9 Razrs and I love them.

 

[tomgodd]

On the MX track I would use a set of 18 on the rear and 20 on the front
Trail riding I would run 21 on the front and 20 on the back