2010 Razor chassis, best size wheels?

First off welcome! Seeing as it's a Razor, and without more information to go on, I would suggest you call the man behind the kart, Stevie Roberts.

http://www.robertskartshop.com/

Chances are, depending on where you intend to run, the track may have rules regarding what tire size and compound to run. Assuming you're not just out to practice of course.
 
I agree with SteveK51, call the shop and the owners Stacy or Steve will put you in the right direction. Great people to deal with !
 
Under new WKA rules you should run 5¨ diameter but if track doesn´t follow that specific rule you might be faster on 6¨.
 
Thanks for the response. i have been in contact with stacy and steve, and i believe they have directed me in a good direction. Thanks again.
 
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