Dad needs to know difference between cr80 and cr85

4 replies to this topic
  • turbotexas

Posted December 31, 2007 - 09:32 PM


I am looking to get my Son a cr85/80 and am trying to avoid getting something he can't race in the super mini class. He has a 96 cr125, but is 13 years old. So He fit's on the 125 but (he's huge) his friends are still in the super mini class, and he wants to race them... I found a cr80 big wheel I am thinking of getting him. I have read the rules on the tire size. but am curious what is the difference is in the two bikes??? besides the 5cc displacement...
Thank you!!!

  • MattFisher

Posted December 31, 2007 - 10:16 PM


The 85cc bikes are just newer bikes that take advantage of a loophole in the rules, just like the 65cc bikes took advantage of the same loophole in the 60cc rules. Originally designed to allow overbore's on 80cc bikes back when every new piston meant you needed to bore it out slightly. Today's bikes have some type of chrome liner instead of a iron sleeve, and are not bored out during a standard rebuild.

The 85cc bikes will be better simply because they're newer, and most get some kind of upgrade every year or so.

Visit the ThumperTalk Store for the lowest prices on motorcycle / ATV parts and accessories - Guaranteed
  • turbotexas

Posted January 01, 2008 - 06:05 AM


Thank you Matt!!
What is a big wheel kit? The guy selling is claiming he has that on the bike...

  • jd3020

Posted January 01, 2008 - 08:20 AM


Big wheel kit consists of 19" front and 16" rear as opposed to 17" front and 14" rear.

  • MattFisher

Posted January 01, 2008 - 10:31 AM


In addition to the wheel sizes, some bikes will have longer swingarms, and/or longer forks. If he's a big kid, the larger stuff will probably be better.

Related Content


07 cr250 by sbos91

Dirt Bike   Make / Model Specific   Honda   Honda 2-Stroke
  • Hot  26 replies

2003 CR250 by asealy20

Dirt Bike   Make / Model Specific   Honda   Honda 2-Stroke
  • Hot  34 replies

Favorite vintage dirt bikes by ToadilyInsane

Dirt Bike   Special Interest Forums   Vintage
  • Hot  46 replies

Street Legal Two Strokes? by Yo_ITS_Yamaha

Dirt Bike   General Dirt Bike Forums   General Dirt Bike Discussion
  • Hot  44 replies

1988 CR250R restoration from basket case by bcavmechanic

Dirt Bike   Make / Model Specific   Honda   Honda 2-Stroke
  • Hot  25 replies

Join Our Community!

Even if you don't want to post, registered members get access to tools that make finding & following the good stuff easier.

If you enjoyed reading about "" here in the ThumperTalk archive, you'll LOVE our community. Come join ThumperTalk today!

The views and opinions expressed on this page are strictly those of the author, and have not been reviewed or approved by ThumperTalk.