Like the CRF 230,  Yamaha TTR 230 comes with marginal tires. In this case, it came shod with Pirelli MT 320s - not our favorite tire.   The front is an 80 - 100 x 21 and the rear is a 110 - 100  x 18.  They were replaced with the excellent Maxxis 51M 100 – 100 x 21 up front and a 110 – 100 x 18 Maxxis 54M at the rear.  

The difference in performance was remarkable.  On our baked-dry practice track, there was no hint of front end washout and the traction under hard acceleration at the rear was superb.   We used Maxxis tires on our Honda and they're holding up quite well.

Changing a tire is no fun under the best of circumstances. However, as long as you have to do the job, you might as well do it right. It's easier, simpler and yes, you can actually do it as long as you follow the step-at-a-time instructions and photos.

So put your bike up on a stand, and do it.

1.  A trash can works great as a tire changing holder.	2.  Here's what you need for an easy tire change; long, slender, tough tire irons.
3.  Remove the valve from the tube.	4.  Remove the 12 mm rim lock nut.
5.  Break the tire loose from the rim by stepping on it.   Use your heel if it's tough.	6.  Using one of the tire irons, start to pry the tire off with a small bite.
7.  Slide the second tire iron in about four to six inches away from the first. Don't be tempted to take a big bite. If the tire is tough, use a bit of soapy water to lube things up.	8.  Here the tire is almost free.  The soapy water really  helped.
9.  Removing the tube is made easier by propping the tire carcass up with the edges of the tire irons.	10.  Remove the tube slowly, using the soapy water if it gets tough.
11.  Next, the tire must be removed thusly.	12.  Tire removed after the rim lock has been taken out and the rubber protective strap slipped off.
13. Start by inserting tire irons like this.  As before, take small bites, rather than big ones.	14.  Now, install the rim lock, then slip on the rubber strip.   If you don't have one, use duct tape.  Gently put the tube in.  To make life easier, install the valve side first.   Put a small amount of air in the shape the tube.  Leave the valve core out.  Put a nut on the valve stem to keep it from slipping out.   Install the rim lock and put a nut on it, too.
15.  Put some air in the tube, then inflate the tire to 20-25 psi and keep an eye on it for a while to make sure you haven't pinched a tube in the process.	16. I run anywhere from 12 to 14 psi in each tire, depending on the terrain.  Then you can tighten down the rim lock nut.

There's your finished product!  Slap the wheels on and go riding.