180/60 Tire Fit and Chain - Page 2 - Yamaha R6 Forum: YZF-R6 Forums
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post #11 of 23 (permalink) Old 05-17-2017, 06:48 AM
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Re: 180/60 Tire Fit and Chain

I made the same switch from 180/55 to 180/60 Pirellis a couple years ago and I can tell you that if your geometry is set right you do NOT want to lower the rear to compensate for the ride height. The center of the tire is taller, but the sides are not. You will notice a bigger change in the revs as you go from upright to leaned over. I pulled that shim out and raised the front a bit based on the tire size difference. When I did this it was the absolute worst my bike has ever handled. It suffered severe understeer, and the front tire started showing geometry induced tearing. Gave me some real big front end slides, too. I talked to the Pirelli vendor and he said I should have just ridden it as-is and see how it feels. I put the geometry back and all that went away. Just made some minor tweaks from there.

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Originally Posted by primacarne View Post
why not just get the right size tire?
It IS the right tire size. 180/55 Pirelli race tires are basically obsolete. They stopped making them in all, but one compound.
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post #12 of 23 (permalink) Old 05-18-2017, 07:24 AM
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Originally Posted by TurboBlew View Post
on my gsxr... the swingarm marks are about 1/4" off on either side. My zx12...5/8". My R6 was an <1/8"
I'd have gotten the frame checked. Never in my life have I been more than 3mm difference. You are talking 15 mm on the ZX12!
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Originally Posted by HIS OWN 6 View Post
if your geometry is set right you do NOT want to lower the rear to compensate for the ride height. The center of the tire is taller, but the sides are not. You will notice a bigger change in the revs as you go from upright to leaned over. I pulled that shim out and raised the front a bit based on the tire size difference.
It is not the same for all riders. I used to have the shim in. As I got faster, I needed to make more changes. I needed more weight on the rear as well. Pulled the shim, changed the forks by 5mm and dropped nearly 2 seconds in a day.
Front end pushing can also be from a number of front end suspension variables.
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post #13 of 23 (permalink) Old 05-18-2017, 07:39 AM
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Re: 180/60 Tire Fit and Chain

True, but in my case it was obviously due to poor geometry. Tire wear was classic geometry tearing, and handling went from good to terrible and back to good over 3 consecutive riding events. Perhaps I was already nearing the limit of not enough weight on the front. But my point is that adjusting geometry to compensate for the upright height difference between these specific tires is going to be an even bigger change for when you're leaned over.
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post #14 of 23 (permalink) Old 05-18-2017, 10:51 AM
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Re: 180/60 Tire Fit and Chain

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I'd have gotten the frame checked. Never in my life have I been more than 3mm difference. You are talking 15 mm on the ZX12!
.

yes thats "production" tolerance for ya. None of my bikes have ever been crashed and were mine since new.
also my zx12 is 17 yrs old now. I cant believe its nearly 2 decades since new.
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post #15 of 23 (permalink) Old 05-18-2017, 01:52 PM
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Re: 180/60 Tire Fit, Chain, and Alignment

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Originally Posted by ih574 View Post
Thanks for the verification. I ride Summit Point Main and Shenandoah as well as NCBike. Plan to get to VIR sometime. Stock gearing was OK with the 180/55, though first is a bit low. Not getting anywhere close to top speed (150+), but then my objective is not outright speed. My main concern with the 180/60 is having clearance for tire growth (and warmers) and managing ride height.

Right now, I have the stock 114 link 525 chain with about 40mm of slack and just enough room for the warmers to go on with a little rubbing. Ordered a new 520 chain (116 link) and sprockets and kept the gearing the same (16/45). Figure that will move the wheel back slightly less than 5/8" (one link, top and bottom). That should be enough.

Now just need to figure out a good way to align the rear wheel - thinking of a pair of 1/4" rods, one in the rear axle and one in the swing arm pivot, using various sizes of rubber stoppers to center the rods.

Thanks again for the feedback.
Multiple ways to skin that cat. Longer chain, like you did, or another popular thing to do is go with smaller sprockets, but the smaller sprockets left handedly extend the wheel base because of the smaller diameters.

16/45 is stock. Going to 15/42 is mathematically the same (ever so slightly shorter, but it's negated with a taller rear tire)

For an intermediate rider, I'd recommend 15/43, or 16/46. You aren't quite up to pace to benefit from taller gearing as you don't have the corner speed required to keep the RPM's up.

For Summit/NCBike, you can most definitely run 17's at Summit and 29's at NCBike with a 15/43 setup as that's what I use. I go back and forth between a 43 and 42, minor differences require slightly different riding style between the two, but honestly I'm splitting hairs for what you're trying to accomplish.

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I was going to continue to trash you rookie clowns but it's not even worth it. You're going to spend the rest of your days wasting away and possibility of aquiring talent because you're too ignorant and stubborn to realize you suck... but could be good. You all just keep proving my points.
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post #16 of 23 (permalink) Old 05-19-2017, 10:10 PM Thread Starter
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Re: 180/60 Tire Fit, Chain, and Alignment

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Originally Posted by High Side View Post
For an intermediate rider, I'd recommend 15/43, or 16/46.
I see why now.

With the stock 114 link chain, I was real spooked by how close the 180/60 was to the swing arm. Wanting plenty of clearance, I got new 520 sprockets (16/45 stock gearing) with a 116 link chain. Wasn't too worried about a bit taller gearing with the taller tire - figured I could use a little higher first gear. But, with no additional sprocket teeth, the 116 chain moved the axle further back than I was expecting. Still ok adjustment range, but I'd like to get the 46 rear and pull the axle back into the middle of the range.

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post #17 of 23 (permalink) Old 05-21-2017, 08:46 PM
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Re: 180/60 Tire Fit and Chain

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Originally Posted by HIS OWN 6 View Post

It IS the right tire size. 180/55 Pirelli race tires are basically obsolete. They stopped making them in all, but one compound.
gotcha.. didnt know
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post #18 of 23 (permalink) Old 05-22-2017, 10:29 PM
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Re: 180/60 Tire Fit, Chain, and Alignment

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Originally Posted by ih574 View Post
I see why now.

With the stock 114 link chain, I was real spooked by how close the 180/60 was to the swing arm. Wanting plenty of clearance, I got new 520 sprockets (16/45 stock gearing) with a 116 link chain. Wasn't too worried about a bit taller gearing with the taller tire - figured I could use a little higher first gear. But, with no additional sprocket teeth, the 116 chain moved the axle further back than I was expecting. Still ok adjustment range, but I'd like to get the 46 rear and pull the axle back into the middle of the range.
Don't change your gearing for the sake of moving the axle adjusters forward a little bit.

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Originally Posted by bburgess05 View Post
I was going to continue to trash you rookie clowns but it's not even worth it. You're going to spend the rest of your days wasting away and possibility of aquiring talent because you're too ignorant and stubborn to realize you suck... but could be good. You all just keep proving my points.
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post #19 of 23 (permalink) Old 05-26-2017, 08:03 PM
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Re: 180/60 Tire Fit, Chain, and Alignment

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Originally Posted by ih574 View Post
Yes. Something exactly like that. In fact that seemed to be an excellent solution, with one possible exception: Where do I find one? So I figured I could fab one using a couple of 1/4 rods and various one-hole rubber stoppers popped into the four different hole sizes in the swing arm pivot and axle. Let me know if the pictured one is available somewhere. Would much prefer to have accuracy of metal cones.



I have a pair of simple inside calipers that I measure the gap between the front of the adjuster and the swing arm cutout. Then I adjust till the gap is the same. Seems pretty good, based on the chain run. But I have a hard enough time steering when its aligned properly and don't need any extra challenge!


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motion pro makes a chain alignment tool. it's cheap as fu ck.

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if you feel like spending money buy some lightech chain adjusters.
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post #20 of 23 (permalink) Old 05-27-2017, 02:40 PM Thread Starter
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Re: 180/60 Tire Fit and Chain

So I went to the track with the bike as above (116 link chain, stock gearing, 180/60, and spacer removed from the top of the shock). Remember, I am just a regular mid pack intermediate. So probably couldn't tell anyway. But the bike felt fine. I didn't notice any change in handling. If anything, it felt better. Of course it always feels good with brand new tires. I did notice I was going through Turn 11 hairpin at NCBike-CW in first and not getting to sixth on the main straight. Maybe I could go one tooth up in the back. I think I am a long, long way from running out of top speed.

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