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Discussion Starter #1 (Edited)
Pirelli vendor at Chuckwalla suggested using a 200/60 Pirelli Diablo TD:

Diablo Supercorsa TD

I am currently using a 190/50 Dunlop Q4.

My Sc77 turns in slower than my vfr800 (with a touring 180/55 in the back:)

Only concern with the 200/60 is the height. May start hitting the mudguard.
Anyone try the 200/60 on their SC77 ?
 

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Running 200/55 ContiTrack Mediums, no issue with turning in or clearance.

I did notice a change in the torque control intervention, I had it set to TC1 or 2 previously with 190/50 or 55, now to get a similar level of intervention I have it on TC3. This is very anecdotal and would recommend an abundance of caution.

My plan is to get it flashed by RC45 to unlock the ability to set the tire size calibration so the TC works as intended.
 

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@jehanzeb great question you ask - I can help.

According to Dunlop the Q4 190/50 has a diameter of 633 mm seen here --> Track Day - Sportsmax Q3+ & Sportsmax Q4 | Dunlop Racing Motorcycle Tires

I know most if not all the track-side tire vendors....did they tell you to simply install a 200/60 Pirelli and go ride?!

Is your gearing/chain length different than stock?

What is your intended use of this SC77 bike?

The PIrelli Diablo Supercorsa 200/60 DOT tire has a diameter of 670 mm - this is the original sized tire on the Ducati Panigale 2018 and newer and it is HUGE!

Cut that in half for radius and that means the rear of the bike will now sit 18.5 mm higher and will make your bike feel VERY different on turn in and exit.

Do you plan to replace the front tire with the 120/70-17" SPV3?

What changes have you made to your bike and are you happy with the way it currently turns BEFORE you considered switching tires?
 

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Discussion Starter #4
Running 200/55 ContiTrack Mediums, no issue with turning in or clearance.

I did notice a change in the torque control intervention, I had it set to TC1 or 2 previously with 190/50 or 55, now to get a similar level of intervention I have it on TC3. This is very anecdotal and would recommend an abundance of caution.

My plan is to get it flashed by RC45 to unlock the ability to set the tire size calibration so the TC works as intended.
200/55 would be another option to consider. I think the new Michelin Power Gp comes in that size.
Heard good things about Conti's but have not tried them yet.
Interesting you had to change TC levels for this. Is your ECU stock ?
If stock, and you are getting intervention means the stock ECU can still detect wheelspin ?
 

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Discussion Starter #5
@jehanzeb great question you ask - I can help.

According to Dunlop the Q4 190/50 has a diameter of 633 mm seen here --> Track Day - Sportsmax Q3+ & Sportsmax Q4 | Dunlop Racing Motorcycle Tires

I know most if not all the track-side tire vendors....did they tell you to simply install a 200/60 Pirelli and go ride?!

Is your gearing/chain length different than stock?

What is your intended use of this SC77 bike?

The PIrelli Diablo Supercorsa 200/60 DOT tire has a diameter of 670 mm - this is the original sized tire on the Ducati Panigale 2018 and newer and it is HUGE!

Cut that in half for radius and that means the rear of the bike will now sit 18.5 mm higher and will make your bike feel VERY different on turn in and exit.

Do you plan to replace the front tire with the 120/70-17" SPV3?

What changes have you made to your bike and are you happy with the way it currently turns BEFORE you considered switching tires?
Thanks this is great info ! I was looking for the diameter of the Q4. If it's 633mm, going to a Diablo with 670mm might give me clearance issue. Not to mention my toes will barely touch the ground (I am 5'4').

Goal is faster turn in without losing Traction control. I lowered the triple clamp 8mm for faster turn in. It helped a bit.

I set the sag on the front and rear and played around with compression and rebound a bit.

Suspension feels plush but this is still a slow turning bike.

What do you suggest ?
 

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Discussion Starter #6
I forget the name of the person I spoke to but the vendor was CT racing, parked right in front of the Aprilia demo truck.

He had some TD takeoff's for sale, mostly 200/60's. Said he uses it on his personal S1000rr.
 

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@jehanzeb

Goal is faster turn in without losing Traction control.
This is a reasonable goal as TC is good to have. It is widely documented here that gearing and tire changes can effect TC so I assume the bike NOT been flashed and you have stock gearing - please confirm.

I lowered the triple clamp 8mm for faster turn in. It helped a bit.
This is likely the wrong choice UNLESS the tire you replaced was significantly smaller diameter than the stock tire.

What is your usage of this bike....track-only, street or both?

What were the stock tires?

What model/year do you have of the SC77?

I set the sag on the front and rear and played around with compression and rebound a bit.

Suspension feels plush but this is still a slow turning bike.
What changes have you made to the bike?

What tires, front AND rear are on the bike and what is the condition of those tires?

Has the suspension been replaced and/or serviced?

What is your weight and riding level?

What kind of laps times were you doing at Chuckwalla?

Does the bike run wide on exit?

Is it difficult to get into the turn?

Where is your bike and rider sag front and rear?
 

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200/55 would be another option to consider. I think the new Michelin Power Gp comes in that size.
Many people do not realize this BUT the number on the side of a tire doesn't always mean what you think.

For example...

Pirelli Diablo Supercorsa SPV3 (DOT track day tire) 200/60 is 670 mm in diameter - can be used on the street AND track
Pirelli Diablo Superbike slick 200/60 is 662 mm in diameter
Pirelli Diablo Superbike slick 200/65 is 672 mm in diameter
Michelin Power Cup 2 (DOT track day tire) 200/55 is 665 mm in diameter - can be used on the street AND track
Michelin Power Performance slick 200/55 is 660 mm in diameter
Michelin Power Performance slick 200/60 is 675 mm in diameter

There is a 6.5 mm difference in rear ride height between the Pirelli and Michelin 200/60 slick results in VERY different handling characteristics not to mention the tire profile.

This is why it is VERY important to pick a tire that fits your needs and stick to it.
 

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@jehanzeb if you have a 2017 CBR1000RR it looks like the bike came with Bridgestone S21 OR RS10 tires....

I find the statement below troubling....

Conveniently for us, we don’t have to wait until we get a unit home to put it on the scales because Honda had a set of scales available for us to measure the pair of new CBRs. Ready-to-ride and with a full tank of gas the base model, fitted with the standard Bridgestone S21 tires, came in at 425 lbs; while the SP model, fitted with Bridgestone V02 racing slick tires specially for this test, weighed 427 lbs.

Found here --> 2017 Honda CBR1000RR and CBR1000RR SP Review

To me this says Honda knew there were problems changing the tire size from stock but I could be wrong.
 

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Discussion Starter #10
@jehanzeb



This is a reasonable goal as TC is good to have. It is widely documented here that gearing and tire changes can effect TC so I assume the bike NOT been flashed and you have stock gearing - please confirm.
Correct yes, completely stock.

This is likely the wrong choice UNLESS the tire you replaced was significantly smaller diameter than the stock tire.

What is your usage of this bike....track-only, street or both?
Both mostly street and some track.

What were the stock tires?
Bridgestone S21's.

What model/year do you have of the SC77?
2017

What changes have you made to the bike?
Tires

What tires, front AND rear are on the bike and what is the condition of those tires?
Dunlop Q4's stock size in front, 190/50 rear. Total about 1000 miles.

Has the suspension been replaced and/or serviced?
No changes or service.

What is your weight and riding level?
170lbs, former roadracer now old and slow:)

What kind of laps times were you doing at Chuckwalla?
Sorry no lap timer at Chuck.

Does the bike run wide on exit?
No, it holds it's line well.

Is it difficult to get into the turn?
Yes! Initial turn in is lethargic. Major body language needed to get it to turn in.

Where is your bike and rider sag front and rear?
32mm front and 28mm rear.
 

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Discussion Starter #11
Many people do not realize this BUT the number on the side of a tire doesn't always mean what you think.

For example...

Pirelli Diablo Supercorsa SPV3 (DOT track day tire) 200/60 is 670 mm in diameter - can be used on the street AND track
Pirelli Diablo Superbike slick 200/60 is 662 mm in diameter
Pirelli Diablo Superbike slick 200/65 is 672 mm in diameter
Michelin Power Cup 2 (DOT track day tire) 200/55 is 665 mm in diameter - can be used on the street AND track
Michelin Power Performance slick 200/55 is 660 mm in diameter
Michelin Power Performance slick 200/60 is 675 mm in diameter

There is a 6.5 mm difference in rear ride height between the Pirelli and Michelin 200/60 slick results in VERY different handling characteristics not to mention the tire profile.

This is why it is VERY important to pick a tire that fits your needs and stick to it.
This information should be made a sticky! Thanks for this.
Yes, I totally agree the sidewall numbers are not always what we are assuming them to be.

I used to race long time ago on a tire called the Dunlop D364.
It was and still is my reference tire profile. Almost shaped like a V.

Give that, would you suggest the Michelin Power Cup 2 tires ?
 

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Discussion Starter #12
@jehanzeb if you have a 2017 CBR1000RR it looks like the bike came with Bridgestone S21 OR RS10 tires....

I find the statement below troubling....

Conveniently for us, we don’t have to wait until we get a unit home to put it on the scales because Honda had a set of scales available for us to measure the pair of new CBRs. Ready-to-ride and with a full tank of gas the base model, fitted with the standard Bridgestone S21 tires, came in at 425 lbs; while the SP model, fitted with Bridgestone V02 racing slick tires specially for this test, weighed 427 lbs.

Found here --> 2017 Honda CBR1000RR and CBR1000RR SP Review

To me this says Honda knew there were problems changing the tire size from stock but I could be wrong.
I read somewhere Honda picked the 190/50 because it was the lightest tire available instead of the normal 190/55. When it comes to wet weight the SC77 is still the lightest standard liter bike made.
 

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32mm front and 28mm rear.
This is the first issue that needs resolved. Set your bike sag to 25-30 mm front and 10-15 mm rear, rider sag 40 mm front and 30 mm rear.

Lmk if you need an explanation of the difference between bike and rider sag.

Also put the fork ride height back to stock.

How do your Q4's look right now with respect to wear? Is there a flat spot in the middle of the rear? Any cupping on the front?
 

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Discussion Starter #14
This is the first issue that needs resolved. Set your bike sag to 25-30 mm front and 10-15 mm rear, rider sag 40 mm front and 30 mm rear.

Lmk if you need an explanation of the difference between bike and rider sag.

Also put the fork ride height back to stock.

How do your Q4's look right now with respect to wear? Is there a flat spot in the middle of the rear? Any cupping on the front?
Sounds good, I will change both sag settings.

The Q4's are wearing evenly front and rear for now.

No flat sports or cupping. I am running 28 front and 30 rear psi.
 

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Just now wore out my stock S21's. I'm going to be trying the Pirelli Diablo Rosso Corsa 2's for street and track duty. I really did not like the 190/50 profile of the stock tire. Hoping the bike feels better at lean with the new hoops (going 190/55). Tires should be coming in on Wednesday and will report back as far as street riding.

Going to Chuckwalla on the 9th where I will really be able to put these tires to the test.

I would try the 190/55 before going to a 200/60. Looking at a 190/55 next to a 190/50, it's a pretty big difference!
 

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@HP17 yea I agree about the 190/55 vs 200/60....many have reported issues switching tires and it seems that Honda had Bridgestone make special V02 slick tires for the press launch of the SC77 in 2017 which telegraphs to me those tires were likely very close to stock diameters....even the 190/55 concerns me....might be better to go with a 180/60.....has anyone tried that? I have not done the research yet to see if this works but maybe the crowd can let us know what has worked and then I can sort the geometry for @jehanzeb and anyone else who cares for the direction....
 

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Discussion Starter #18
Just now wore out my stock S21's. I'm going to be trying the Pirelli Diablo Rosso Corsa 2's for street and track duty. I really did not like the 190/50 profile of the stock tire. Hoping the bike feels better at lean with the new hoops (going 190/55). Tires should be coming in on Wednesday and will report back as far as street riding.

Going to Chuckwalla on the 9th where I will really be able to put these tires to the test.

I would try the 190/55 before going to a 200/60. Looking at a 190/55 next to a 190/50, it's a pretty big difference!
Thanks for the feedback! Please do report back how it feels after Chuckwalla.
Yes, the 55 is 649mm tall vs 633mm for the 190.
 

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Discussion Starter #19
...might be better to go with a 180/60.....has anyone tried that? I have not done the research yet to see if this works but maybe the crowd can let us know what has worked and then I can sort the geometry for
A 180/60 makes the most sense but not too many tire makers offer that, do they ?
In theory it should be the quickest steering size.
Though I read somewhere a six inch rim will distort the profile of a 180 but unsure on the 180/60 combo.
 

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@jehanzeb the 180 will work on a 6" rim but the profile will be slightly different but will work just fine. I am just exploring ideas to give you a bike that handles well with a tire diameter close to oem but have not made a determination yet.
 
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