Tire sizes effects

mtbkris2
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San Diego, CA US

So Yamaha specs the 22 yz450 with a 120 rear, I’m curious what kind of effects I could expect if I swapped for a 110? Will it turn better/worse, or have any effect on stability, etc?

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CarlinoJoeVideo
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Portland/Los Angeles, CA US
4/4/2025 9:43pm

In the context of motorcycle tires, a 120 rear tire is generally wider than a 110, offering more traction, especially on dry, hard tracks, but potentially impacting cornering and rut control. 

 
Here's a more detailed breakdown:
Tire Width:

The numbers in motorcycle tire sizes (like 110/90-19 or 120/80-19) indicate the tire's width in millimeters (110 or 120) and the aspect ratio (the height as a percentage of the width). 

 
120 vs. 110:

A 120 tire will have a wider contact patch, leading to more traction in a straight line, but it can also make the bike feel less agile in corners and potentially make the bike stand up more in ruts. 

 
Cornering and Handling:

Some riders prefer 110 rear tires for improved cornering, roll-over smoothness, and better control in ruts, even though a 120 offers more straight-line traction. 

 
Tire Shape:

The larger carcass of a 120 tire can make its cross-section less round and more squarish, potentially affecting handling. 

 
Factors to Consider:

The best choice depends on riding style, terrain, and personal preference. If you focus on starts and straight-line speed, a 120 might be preferred. If you prioritize cornering and rut control, a 110 might be better. 

 
Manufacturer Variations:

Keep in mind that tire sizes can vary between manufacturers, so a 120 from one brand might be different from a 120 from another. 

 
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yamathumb
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Redding, CA US
4/6/2025 7:14pm

It'll definitely spin easier on top end instead of wheelieing. That being said I go back and forth on a 450. 110 more flickable, more forgiving of over throttle( in a way) when it spins instead of lifting a wheelie in all gears. If u want hit and maximum lurch a 110 ain't it.

BikePilot
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Golden, CO US
4/6/2025 8:09pm

I think a 110 turns better, but sometimes has a bit less traction.  I just took a 120 off my Husky and spooned on a 110 fwiw. 

7eleven
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Aliso Viejo, CA US
4/7/2025 3:54am

I tested the feel from each, back to back on the same day, when I worked for Pirelli. I choose 110 for the lighter feel in the air and overall quicker motions from the bike. The rotating mass in the air from each was extremely noticeable. On a 450, I think you need all of the above and as much as you can get. 

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