Motocross tires 120/80-19 vs 110/90-19 rear size comparison using the Dunlop mx33 dirt bike mx sx

I decided to do a review of the two common tire sizes that fit onto the 2.15-19 rear rim on todays MX bikes. What is the difference and can you tell? I'm no expert but I'm probably better then you and MXA combined.

[@Ozfreerider_adventures]

These 2 tires are NOT 15 mm in heigh difference they are 5 mm different . Which means bike will be 2.5 mm higher in rear .

[@zackiaryruddick701]

Aren't they 10 mm different ? The 90 is 10mm higher than 80 right ? I'm trying to understand the difference 😅

[@Ozfreerider_adventures]

@@zackiaryruddick701 the 80 and 90 rating is a “ratio” of the width or the tyre then used for height . not a direct measurement of the height .

[@zackiaryruddick701]

@@Ozfreerider_adventures the 80 and the 90 are the Hight of the Tyer they are indeed 10 mm different I measured them and they are 10mm difference , where are you getting your info from?? The 110 and 120 are also 10 mm different , how can it be a ratio when they actually measure up ?? You can literally see the difference in size on the video please explain how you know

[@Ozfreerider_adventures]

@@zackiaryruddick701 google aspect ratios . Here’s an example -The aspect ratio, or profile, refers to the height of the sidewall as a % of the section width. In our example, 55 means the height is equal to 55% of the 195mm width. The bigger the aspect ratio, the bigger the sidewall will be.

[@zackiaryruddick701]

@@Ozfreerider_adventures I was told by tyer fitter that a 90/110 tyre is 90 mm High and 110 width you are saying that's not correct ? but I measured the tyer and it is indeed 90 high and 110 width why would you bring aspects ratios in to the matter ? That just makes it sound confusing you may be right but I don't understand how the tyer measures up

[@stringbender247]

Best tire explaination I've seen. My son and I have done basically the same test with our KX450f and KX250f besides ours being both 4 stroke's. But your exactly right on all counts. Awesome video

[@EA383RM]

Will the 120 being shorter take away a bit of top end compared to the 110?

[@stunna_954]

Do they fit on the same size rim?

[@kananisA75]

Dude thank you !!!!! i have been searching all over for those answers!!!!! What would you prefer for trail riding in the rear the mx33 or the mx53 ?? keep in mind there all kinds of dirt where i ride.

[@malikedwards2180]

Are you related to the mechanic with the channel up all night? You guys sound identical

[@keithalexander36]

@malikedwards2180 lol you know it. That's my twin brother

[@malikedwards2180]

@@keithalexander36 wow.. il take your advice on board.. im a subcriber to his channel his content is gold

[@paullussier9349]

Do they make 120/90.To keep height & gain width?

[@harrisonself6000]

Yea I got some 120/90x19 mx53 for my crf450r

[@jamie55555]

hi what dirt tire would you recommend for a 19 inch (Front rim) thanks

[@manko330]

Good video.Turning the yz250 into a hare scramble bike.thinking about rear 18 inch or trying the 120/80/19 so i do not have to buy a new rim.What gearing for each tire?

[@ZPDSurvival]

Great Video. Been searching all this data for the XT250. Stock 120/80-18. Was wondering what 120/90 would do? Raise the rear and set suspension off. Might just stick with stock sizes.

[@peteh8077]

It's only 3mm taller. The sidewall height is a percentage of the width. 80%of 120 vs 90% of 110. 3mm.

[@keithalexander36]

In theory yes. However as you see in the MX33 tires it's over 10mm. It's not always an absolute with tires and brands its more of a range or group. Even my mustang with staggered wheels I have to pick the right 315 rear tire to keep from rubbing because it Even varys in width by as much as an inch from Nitto 555r to Nitto 05r and they are both 315/35/17. Thats why I made it clear both tires were mx33 as other brand may have a much different outcome.

[@ZPDSurvival]

@@keithalexander36 Very True Indeed.

[@todcolvin1264]

Not coreect. It is 3mm on each side of the rim

[@eyalcr500]

thank you so much for that video !!! i've been searching everywhere to find such an important info , wanting to swap my rear wheel to 19" (cr500r , because can't get 18" motocross tires anymore here in Israel...) , and didn't know which mx33 to choose - the 120/80-19 or the 110/100-19 ! and i just hate tall tires because they give the "stink bug" feeling rear end. now, if i get the forks lower, it does compensates in a way but not so good because you still get a longer wheelbase, for you must take the rear wheel more back in the swingarm or the taller tires bite off the mud flap and get too close to the swingarm ... so, great comparison, take care , greetings from Israel !

[@Workerbee-zy5nx]

They look identical. 😂

[@mattolsen1261]

Perfect! Awesome video

[@ktmracer100]

Thank you for the detailed information! Did you notice any rubbing anywhere with the 120/80? I’m looking at getting a Dunlop MX14 and am concerned it may rub on my yz250

[@keithalexander36]

No rubbing. everything was good.

[@b8ascrub]

So my son has a SSR 189, it comes with 100/90-16.. I’m wondering what a 110/90-16 will do if anything, he thinks it’s a bit squirrelly with the narrow rear tire.

[@rollypollyraviolli4474]

I would suggest against it. I'd look at picking a better tire in stock size. Premium tires for small bikes are honestly pretty cheap and totally worth the extra (better tires means more traction means more safety... tires are cheaper than medical bills). A 100/90 means 100mm width, with 90% of the width as tire height, so in this case, 90mm height. A 110/90 would be 10mm wider, but still 90% width to height ratio, so 99mm height. Pretty much an extra centimeter from rim to tread over the stock size on BOTH sides of the tire, meaning that it would be an overall increase of about 2cm or roughly 3/4" wheel diameter. Not only would that have an impact on the overall gearing ratio between the final drive and the wheel (bigger wheel means less torque, more speed), but it would also impact the geometry and handling of the bike, effectively shifting weight bias toward the front wheel. That might not be a complete negative since it will help with front-end turning, but it will also reduce the traction of the rear tire and likely make the "squirrely" feeling even worse.

[@ZPDSurvival]

@@rollypollyraviolli4474 I took a screen shot of your comment because it is very important information. Thank You. Best video out here on the YTubes talking about this subject I found so far. Tire size and Suspension.

[@unknownmember99]

What do you think about going from a 100/90/19 to a 110/90/19 on crf250r?

[@Gabriel19-87]

250/350 100/90-19 450 110/90-19

[@sergeantgrannyshifter8617]

@@Gabriel19-87 pretty much all new 250 four strokes come with 110/90x19 so why not

[@jarongray5230]

Can you put both tires on the same rim? I really need to know

[@keithalexander36]

Only one at a time but yes. Both tires are made to fit on the 19/215 rim

[@busby905]

​@keithalexander36 can u put both on a 250F rim ? ( 19 X 1.85 )

[@r90jonneyabbosh36]

@@busby905yes you can