120/90/ vs.120/80 Tires

captmoto
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Location
Rancho Cucamonga, CA, USA

Can you feel a difference? Am I as an old and slow guy going to know the difference. Chaparral has an in store closeout of 120/80-19 MX33. It's about $45 more for a 120/90 MX34. What's the Dunlop alternative for SoCal tracks?

Inquiring minds and all that.

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3strokemx
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9/2/2010
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9/20/2024 10:33am

You won't notice any difference.

crc245
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10/29/2007
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Yorba Linda, CA, USA
9/20/2024 1:36pm Edited Date/Time 9/20/2024 1:36pm

Save the money, get the MX33. Faster guys than me, and most in-house manufacturer test riders, prefer MX33 rears to the MX34. Still lots of discussion/debate on best front tire, but it's mostly unanimous regarding the rears.

Additional notes: The 120/90-19 MX34 is a really good tire. Just not $45 mo' betta' in this case. Dunlop downsized the 110/90-19 MX34 rears (compared to the MX33 sizing), to be a better 250F tire. They also want the 120/90-19 to be the most commonly used rear, making it lighter than even the 120/80-19 MX34. Tire sizing varies GREATLY by brand, don't be afraid to give it a test and report back...

1
captmoto
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5921
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4/22/2009
Location
Rancho Cucamonga, CA, USA
9/20/2024 3:45pm
crc245 wrote:
Save the money, get the MX33. Faster guys than me, and most in-house manufacturer test riders, prefer MX33 rears to the MX34. Still lots of discussion/debate...

Save the money, get the MX33. Faster guys than me, and most in-house manufacturer test riders, prefer MX33 rears to the MX34. Still lots of discussion/debate on best front tire, but it's mostly unanimous regarding the rears.

Additional notes: The 120/90-19 MX34 is a really good tire. Just not $45 mo' betta' in this case. Dunlop downsized the 110/90-19 MX34 rears (compared to the MX33 sizing), to be a better 250F tire. They also want the 120/90-19 to be the most commonly used rear, making it lighter than even the 120/80-19 MX34. Tire sizing varies GREATLY by brand, don't be afraid to give it a test and report back...

I'll give it some thought, maybe head over the Chaparral in the morning and grab a tire.

MxAddic
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11/24/2022
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USA
9/23/2024 4:08am

The /90 feels heavy and like a balloon tire to me. No dice.

It will also change your gearing.

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