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Tire size??

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I have an '07 SXF 250 and I need a new rear tire. I am going to opt for the Dunlop MX51 but I'm not sure what size to get. When MXA tested shorts 350 they said they ran a proto Dunlop 120 size on harder tracks and a 110 on tacky dirt. http://motocrossactionmag.com/Main/News/WE-RIDE-ANDREW-SHORTS-FACTORY-KTM-350SXF-8106.aspx

Dunlop makes the MX51 in 100/90-19, 110/80-19, 110/90-19 120/80-19

What do you guys suggest?

Thanks

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I have the same bike I use as a practice bike and I currently have a Dunlop 756 100/90/19. I heard they discontinued that tire so I will also be looking into new rubber here shortly and have decided to run a wider setup, I'm leaning toward a 110/90/19 and hope to hook up a little better, the only downside is it takes more power to turn a wider/heavier tire so I'll also be looking into some performance mods, not sure if that helped but thats all I got

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is it really that noticeable of a power loss to turn the heavier & wider tire?

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I'll let you know in a few months when I change it, I didnt notice any loss when I put a 140/80/18 on my CR500 but I don't think anyone would

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