What rear tire width??
 

What rear tire width are you using on your bike and why If posting. Also please include your engine size.

Always run a 140 Mich S12 but that's mis-leading since their standard of measuring is way off from other manufacturers. Ive always considered it about a 120.
2014 300
Wider tires feel generally more stable, and allow for lower pressure for me. Only downfall is in deep ruts, a 110 will claw through the rut better.

We use a 110 on the 200 and a 120 on the Husaberg 300.

Uggh.
Not really the info you were looking for?

Tire widths and why.
Lots of variables.Also side wall height is relative to the width and how that equates into traction.Throw air pressure in the mix and traction qualities of a particular tire or tread design add traction availabilty and conditions.
Horsepower and horsepower characteristics-torque or revver or somewhere in the middle?
Ripped fit 165 pounder on a 2502t or fattass on a 300 2t or maybe fattass on a 200 2t
Sandy loam or techncal steep single line slick and rooty trails?

Point is nobody can use a tire size recommendation unless you get the rest of the story.
So what a guy runs means squadoosh to another rider.

Here's some simple parameters.Very basic and vague.
Wheel spin is very important on a 2 stroke.A 4t not as critical but still a factor.
A skinnier tire will hold edges better.A wider tire will sluff off into ruts and blow corners easier.
A skinnier tire will give you less traction and allow the engine to work easier while a wider tire gives more traction and makes the engine work harder.This is a generalization and in this instance do not confuse traction with performance

So assuming you have the right tire to match terrain and conditions with the right amount of traction for the rider weight and horse power characteristics

You should
A. Feel like you can find traction anywhere with ease
A

B.Feel like you can spin the tire at will with a little throttle or throttle and clutch action depending on the gear you are in and the available traction at the time.

In summary you want a tire that gives you maximum traction while being able to easily control tire spin and maintain optimum engine performance.

Hope this helps

Bridgestone x30 110 . On both of my bikes ktm 450 and an 18 xc 250