Skinny tires - Yamaha R3 Forum
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post #1 of 21 Old 03-31-2017, 04:52 PM Thread Starter
crv
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Skinny tires

So why are r3 tires so skinny? Like even ktc 125 and aprilia 125cc bikes have 150 rear tires yet the 321cc r3 has 140 rear. Why do smaller bikes than the r3 get bigger tires? Does that mean that I can easily upgrade to 160 tires in the rear and 120 in the front as it is a bigger bike than the aprilia 125 and ktm
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post #2 of 21 Old 03-31-2017, 05:52 PM
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It has nothing to do with the size of the bike, but what wheels it uses. The rear wheel on these is a 4.0". Most 140/150 tires are meant for 4" wheels. 160/165 are meant for 4.5" wheels, and so on. Always look at what the tire manufacturers recommend.

Why do people always want bigger tires??

2007 ZZR600 (street bike)
2010 1198 (race bike, parted out across the country)
2006 CBR600 (street/track, sold)
2013 CBR500R (race bike)
2009 ZX6R (race bike)
2015 R3 (project bike, future race bike hopefully)

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post #3 of 21 Old 03-31-2017, 06:53 PM
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Originally Posted by sbk1198 View Post
It has nothing to do with the size of the bike, but what wheels it uses. The rear wheel on these is a 4.0". Most 140/150 tires are meant for 4" wheels. 160/165 are meant for 4.5" wheels, and so on. Always look at what the tire manufacturers recommend.

Why do people always want bigger tires??
Because it looks so cool! Never mind possibly(not always though) ending up with crap handling when the bike has a big rear and front tire!

That said, the R3 has successfully been fitted with 150-160 tires.
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post #4 of 21 Old 03-31-2017, 08:03 PM
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Has anyone fitted a 120/70-17 on the front along with the 150/70-17 on the rear. I would like to know about the front fender clearance with the 120/70.
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post #5 of 21 Old 03-31-2017, 08:23 PM
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Has anyone fitted a 120/70-17 on the front along with the 150/70-17 on the rear. I would like to know about the front fender clearance with the 120/70.
I was wondering the same thing and this video confirms 120/70 front and 160/60 rear will fit, so I'm assuming the 150/70 will fit no problem.

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post #6 of 21 Old 03-31-2017, 10:26 PM
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Originally Posted by Kojiiro View Post
Because it looks so cool! Never mind possibly(not always though) ending up with crap handling when the bike has a big rear and front tire!

That said, the R3 has successfully been fitted with 150-160 tires.
I know I'll be running 120/150 Pirelli SC's on mine, but it's not for coolness factor and because I'm wondering why Yamaha put "such skinny" tires on it; it's for racing and because there aren't many options available for race tires in other sizes that fit. Plus, even though I haven't been able to confirm this yet, I'm pretty sure the R3 still uses a 3.5" rim, like pretty much every other sport bike out there, so there's no reason to not have a 120 tire on the front. Pirelli recommends the 110 for 3.0" rims and the 120 for 3.5".

2007 ZZR600 (street bike)
2010 1198 (race bike, parted out across the country)
2006 CBR600 (street/track, sold)
2013 CBR500R (race bike)
2009 ZX6R (race bike)
2015 R3 (project bike, future race bike hopefully)

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post #7 of 21 Old 03-31-2017, 10:44 PM
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I think Valentino Rossi said it best when it comes to tire recommendations, the best are "black and round". More round more better.
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post #8 of 21 Old 04-02-2017, 07:20 PM
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Let me give you a hint: Moto 3 riders don't use a bigger tire for "racing" purposes.
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post #9 of 21 Old 04-03-2017, 03:57 PM
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Let me give you a hint: Moto 3 riders don't use a bigger tire for "racing" purposes.
Moto3 riders are also on slicks with a very different suspension setup. I know a guy that races his R3 with a 90/110 setup and slicks.
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post #10 of 21 Old 04-03-2017, 07:52 PM
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Well I was wrong about the front wheel...it is a 3" not a 3.5". Oh well, already ordered the tires. Guess I'll see how I like the 120 SC1 and then decide if I want a 110 for next time.

2007 ZZR600 (street bike)
2010 1198 (race bike, parted out across the country)
2006 CBR600 (street/track, sold)
2013 CBR500R (race bike)
2009 ZX6R (race bike)
2015 R3 (project bike, future race bike hopefully)

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