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Posible standard for the R3 would be:

Front 110/70-17

Rear 140/70-17

Good choice:

Metzeler Sportec M5 Interact
Dunlop Q3
Pirelli Rosso Corsa
Michelin Pilot Road 3
 

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Metzeler is a German company been around 1863. Pirelli and Metzeler joined forces a few years ago. While Pirelli marketed more toward the sporting side of motorcycle tires Metzeler will edge closer to the cruiser and touring riders who love high-mileage tires. Of course, the Sportec M5 Interact and Rosso is about the same compound.
 
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Metzeler is a German company been around 1863. Pirelli and Metzeler joined forces a few years ago. While Pirelli marketed more toward the sporting side of motorcycle tires Metzeler will edge closer to the cruiser and touring riders who love high-mileage tires. Of course, the Sportec M5 Interact and Rosso is about the same compound.
I guess thats why i never heard of them, never ventured out into the cruiser market, always had my eyes on sport bikes.
 

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Let try to figure this out logically
Gw250 tire size front 110/80/17 rear 140/70/r17
Gsr400 front 120/70/r17 rear 180/55/17
Gsr600 front 120/70/r17 rear 180/55/17
Ninja250 front 110/70/17 rear 130/70/r17
Ninja300 front 110/70/17 rear 140/70/r17
Ninja600 front 120/70/17 rear 180/55/17
So now let see the possibilities for the yamaha
Yzfr3 ??????
Fzr( I know its old) front 110/70/17 rear 140/70/r17 Yzfr6 120/70/r17 rear 180/55/17

So looking at that... On the cheap side worst case trying to save money. Yamaha would do front 110 and rear at 130.. But with at much power it wont happen .there is a strong possibility it will get a 120 front and 180 rear. Just like the r6 less inventory less Hassel easyer for the company. If they wanted to make the tires look more proportional to the bike they should go with 110 front and 140 rear... ... I hope the go for more grip at 180
 

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Let try to figure this out logically
Gw250 tire size front 110/80/17 rear 140/70/r17
Gsr400 front 120/70/r17 rear 180/55/17
Gsr600 front 120/70/r17 rear 180/55/17
Ninja250 front 110/70/17 rear 130/70/r17
Ninja300 front 110/70/17 rear 140/70/r17
Ninja600 front 120/70/17 rear 180/55/17
So now let see the possibilities for the yamaha
Yzfr3 ??????
Fzr( I know its old) front 110/70/17 rear 140/70/r17 Yzfr6 120/70/r17 rear 180/55/17

So looking at that... On the cheap side worst case trying to save money. Yamaha would do front 110 and rear at 130.. But with at much power it wont happen .there is a strong possibility it will get a 120 front and 180 rear. Just like the r6 less inventory less Hassel easyer for the company. If they wanted to make the tires look more proportional to the bike they should go with 110 front and 140 rear... ... I hope the go for more grip at 180
Michelin Pilot Streets

FRONT: 110/70-17
REAR: 140/70-17
 

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This is in keeping with their one-upsmanship over the Ninja 300. Almost everything is a little better...bigger engine, more hp, more torque, lighter weight, larger rear tire. I'm surprised they didn't put the redline at 13,000 vs. 12,500 for the Ninja 300 too. No doubt in my mind Yamaha is going after the Ninja 300 market mainly. They will catch some CBR300R and KTM RC390 sales as well...provided they get the bikes out instead of doling them out slowly one or two per dealer in 2015. If I wasn't planning to trade in a bike, I would already have worked out a price and put down a deposit.
 

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Depending on which Yamaha site you go to, the specs list the rear tire as either 180 or a 140, so I'm not sure now. I'm thinking 140 though. The photos I've seen all look like a 140. I was on the Alamo Cycle Plex, San Antonio site and clicked on Yamaha motorcycles, then found the R3 and specs. That's where it lists the rear as 180. Might just be a typo.
 

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okay so now we know the tire sizes and make.. 110 F 140 R michelin pilot road(not radial)

My question is can you size up the rear? if so how big? is it worth it? And what do you think of perelli corso, they are radial right?
 

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Probably could go up to a 150 rear, but any bigger would deform the tire on the narrow rim. I put a 170 on a rim that was factory shod with a 150, and it will have permanent "chicken strips" because the narrower rim pulls the carcass inward. I would have to lean like Mark Marquez to scrub the tread at the edges. Next tire change I'll go down to a 160.

180s are meant for 6" wide rear rims; the R3 has 140 section tires on rims probably 4 1/2" wide. 180mm minus 140mm = 40mm or 1 5/8" difference in tire/rim width.
 
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