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Discussion Starter #1
Hi Guys, I want to tap into a bit of knowledge from the racers/trackers here.
I've purchased a Triumph Daytona 675r and plan to track it alot next year. I may also enter a few race rounds, well i will actually.

My question is regarding tyres.
The bike comes standard with a 180 on the rear. And ive always used and liked 180's. I have ridden bikes with 190's on, but Ive never really had a chance to test a 190 properly, not on track at least.

Im doing a track weekend in Cartegena in Spain in a month and im going to purchase some tyres before i go. My question is, what are the real pros/cons between 180 vs 190.

My understanding is:
190's give a larger contact patch and allow more extreme lean angles(BTW its a 5.5inch rim and i believe most 190s are for 6 inch rims so does this increase ride height?)

190's, especially those on a 5.5inch rim, make the bike less agile, ie harder to flick from one side of the tyre to the other.

A 190 can often mean that suspension needs resetting up?

what do you guys suggest? Ive been riding for 17 years, but im fairly new to track riding. I'd like to think im a quick rider, but wouldnt we all....

From the 180's that ive used in the past, ive gone right to the edge on all of them so would i benefit from that extra 5mm on the 190?

Sorry if this has been discussed in the past. I guess it probably has.

cheers
Rich
:f4:
 

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Hi Guys, I want to tap into a bit of knowledge from the racers/trackers here.
I've purchased a Triumph Daytona 675r and plan to track it alot next year. I may also enter a few race rounds, well i will actually.

My question is regarding tyres.
The bike comes standard with a 180 on the rear. And ive always used and liked 180's. I have ridden bikes with 190's on, but Ive never really had a chance to test a 190 properly, not on track at least.

Im doing a track weekend in Cartegena in Spain in a month and im going to purchase some tyres before i go. My question is, what are the real pros/cons between 180 vs 190.

My understanding is:
190's give a larger contact patch and allow more extreme lean angles(BTW its a 5.5inch rim and i believe most 190s are for 6 inch rims so does this increase ride height?)

190's, especially those on a 5.5inch rim, make the bike less agile, ie harder to flick from one side of the tyre to the other.

A 190 can often mean that suspension needs resetting up?

what do you guys suggest? Ive been riding for 17 years, but im fairly new to track riding. I'd like to think im a quick rider, but wouldnt we all....

From the 180's that ive used in the past, ive gone right to the edge on all of them so would i benefit from that extra 5mm on the 190?

Sorry if this has been discussed in the past. I guess it probably has.

cheers
Rich
:f4:
On a 675, I'd stick with a 180 Rich.
Yes the steering will be affected because of ride height, but also because of that increased contact patch.
But the worst is the unspring weight, put a 180 on a scale and then a 190, not a nice result for a 675 motor or your suspension.
Just my AU$2.00

Oh yeah, then there's the price difference.
 

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Tyres

From experience I would go with a 180 tyre to start

If you need more grip then you are are a better man than me.
I swapesd a 190 for a 180' on my 750 and felt it changed direcetion much quicker.
BUT!! With my current 312 I have no problem with the sticky Michelin Moto 2 200 section, tyres at all in Cheste.
No help, but whatever you are happy with
 

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Discussion Starter #4
thanks guys, i have gone for the 180's, thanks for the advice, i hadnt even given weight a thought.
 

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Depends on the tire brands. Dunlop doesn't make a race tire in 180. They market their 190's to the 5.5" rim and 200 to the 6" rim.

Also I believe the Pirelli 180/60 is the same size as the their 190/55.
 

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How can a 180/60 be the same size as a 190/55?

tiresection.jpg
 

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Easy Chuck, believe me, that drawing means nothing in todays tyre construction.
Remember, 180/60 means that the sidewall is the equivalent of 60% of the usable 180mm tread pattern, and therefore, 190/55 is 55% of 190mm useable tread pattern is sidewall construction. Work that out.
And then, when you're done, look at the bow in the carcass construction, I mean tyre on rim, it will make you a believer.....
 

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It is still a different "size"...that is the standard for measurement, not the fitment on a particular wheel.

Terms are important. 190 gives 10 mm more rubber surface, edge to edge, than a 180.
 

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Where's the fun in that?:smoking:
 

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In a perfect world

It is still a different "size"...that is the standard for measurement, not the fitment on a particular wheel.

Terms are important. 190 gives 10 mm more rubber surface, edge to edge, than a 180.
But if the tyre is "bowed" out that much, that the extra rubber can't touch the road before pegs, knee's and fairings, then you've gained nought.
 

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Absolutely agreed, Dons.
 

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But if the tyre is "bowed" out that much, that the extra rubber can't touch the road before pegs, knee's and fairings, then you've gained nought.
Agreed. My dunlop 190/55, which are designed for a 5.5" rim. I have chicken strips on the sides because it is impossible to use all the tire without being on your butt sliding across the track.

Donsy is correct on tire dimensions not meaning exactly what they use to.

In this thread is the Pirelli size chart for tire dimension. Sorry didn't have time to copy and save the image.
http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.apriliaforum.com/forums/showthread.php?271492-School-me-on-Pirelli-Diablo-Superbike-Slicks/page2&ei=TO1PVPevFc-pyASs7YH4Dg&bvm=bv.78597519,d.aWw&psig=AFQjCNE_UntwAf-e_ATLEBR_iPGR4U5rxA&ust=1414610554227771
 

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Agreed. My dunlop 190/55, which are designed for a 5.5" rim. I have chicken strips on the sides because it is impossible to use all the tire without being on your butt sliding across the track.

Donsy is correct on tire dimensions not meaning exactly what they use to.

In this thread is the Pirelli size chart for tire dimension. Sorry didn't have time to copy and save the image.
http://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0CAcQjRw&url=http://www.apriliaforum.com/forums/showthread.php?271492-School-me-on-Pirelli-Diablo-Superbike-Slicks/page2&ei=TO1PVPevFc-pyASs7YH4Dg&bvm=bv.78597519,d.aWw&psig=AFQjCNE_UntwAf-e_ATLEBR_iPGR4U5rxA&ust=1414610554227771
The tire sizes mean exactly what they used to. People just like to exploit dimensions in order to change dynamics.
 

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Do you mean "Peope" as in tire manufactors? The Pirelli 180/60 has a 193mm width. Using the pic you posted, which I agree with on how to size a tire, means the tire is actually a 190 that is marketed as a 180. I believe they only market them as 180s so people know they were designed for 5.5" rims.

The big question I have on the new race tire sizes for 5.5" rims, are the width measurements taken mounted or unmounted on the rims? I assume unmounted because of the unused part of the tire on my ZX6r.
 

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nk140, are you saying the mounted and inflated width of a Pirelli 180/60 on a 5.5 inch rim is 193mm?
 

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The big question I have on the new race tire sizes for 5.5" rims, are the width measurements taken mounted or unmounted on the rims? I assume unmounted because of the unused part of the tire on my ZX6r.
Make no assumptions. Tire storage practices and tire dynamics would dictate that dimensions are for properly mounted and inflated tires.
 

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Some things require common sense. Any tire will not have a uniform dimension if it is not constrained by mounting and inflating. Tires are designed for a particular rim dimension by convention. If you put a 180 section tire on a 3.5 inch rim or on a 7 (dimensions exaggerated for dramatic effect) inch rim the final dimensions will vary and some will be dangerous.
 
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