195/55 Tyre

[SP2UK]

Originally Posted by johnyisthedevil

well lets talk about the tire numerology for a second.

first # 190/195 etc etc. is the section width of the tire in mm.
2nd# (aspect ratio) 50/55 and so on is (in simple terms) how tall the tire is, and is a percentage of the width. ie. 55% of 195 mm.

so with all of that out of the way let's talk about why everybody likes to use the 180/55 and 190/55. it's because of the profile. if you look at the tire from behind it's the shape of the tread. they are much more round. so there is more tread surface on the side. these two tires have a larger contact patch when leaned over because of their shape. most go with the 180 because it is cheaper, but some would argue that it's profile is better than the 190.

the 190/50 has a pretty flat profile and is considered crap. I think for most street riders it is fine though, but most rc guys are not your typical street rider.

so now lets talk about the 195/55. so in essence you have gone to a tire that is 5mm wider right? since the width and aspect ratio are not a directly linear relationship you have effectively negated the benifits of using the 190 or 180/55. sure it's going to be taller by default, but not enough to offset the increase in width. think about holding a pipe cleaner and curving it. if you push the ends closer together it gets taller/ or has a higher aspect ratio. if you pull them apart you decrease the aspect ratio and have a flatter profile. so the question is do you want to put more rubber on the road while you are verticle or when you are leaned over?

My lesson for today Thanks for that.

[James_03_RC]

All morning I have been looking for info on what size has what pro/con. I know I wont need it or use all of it. Think Im going with a 190/55 (pre. owner has a 180/55 on her) Having the added traction and the extra lean angel will be nice to have for when I need it.

Thanks for the help

[RVTMAVERICK]

Originally Posted by James_03_RC

All morning I have been looking for info on what size has what pro/con. I know I wont need it or use all of it. Think Im going with a 190/55 (pre. owner has a 180/55 on her) Having the added traction and the extra lean angel will be nice to have for when I need it.

Thanks for the help

Yes sir the SEARCH function really is nice...

FYI... 190\55 is Great No doubt.... BUT the 180/55 Rocks too... There is nothing wrong with the 180/55...... which beats the hell out of a 190/50

[bmfgsxr]

Originally Posted by RVTMAVERICK

Yes sir the SEARCH function really is nice...

FYI... 190\55 is Great No doubt.... BUT the 180/55 Rocks too... There is nothing wrong with the 180/55...... which beats the hell out of a 190/50

problem with using the 180/55 on a 6" rim (its meant for a 5.5") is that it flattens out the profile of the tire hence giving you less contact patch while leaned over than the 190/55(think of the old pipe cleaner analogy). the tire manufacturer will tell you this information. 180's simply arent meant for a 6" rim. if im not mistaken dunlop even recommends a 190/55 on a 5.5 over the 6" rim. im gonna have to dig up some info.

[RAZR51]

Originally Posted by James_03_RC

All morning I have been looking for info on what size has what pro/con. I know I wont need it or use all of it. Think Im going with a 190/55 (pre. owner has a 180/55 on her) Having the added traction and the extra lean angel will be nice to have for when I need it.

Thanks for the help

I ran a 190/60 on the track.....great turn in.

[RVTMAVERICK]

Originally Posted by bmfgsxr

problem with using the 180/55 on a 6" rim (its meant for a 5.5") is that it flattens out the profile of the tire hence giving you less contact patch while leaned over than the 190/55(think of the old pipe cleaner analogy). the tire manufacturer will tell you this information. 180's simply arent meant for a 6" rim. if im not mistaken dunlop even recommends a 190/55 on a 5.5 over the 6" rim. im gonna have to dig up some info.

Naa.. You don't have to dig up anything for me... However, I will say this, IF you talk to any tyre manuf., They will also tell You, the "Rule of Thumb" with tyre sizes is... Whatever the OEM uses.... They normally will say, you can go Up OR down 1 tyre size...

Hey,.. I'm NOT saying a 190/55 isn't Awesome, Because it IS!.... All's I am saying is... 180/55 rocks too on OUR RC51's and it IS even Better then the 190/50! That's all

Peace Jeff

[bmfgsxr]

Originally Posted by RVTMAVERICK

Naa.. You don't have to dig up anything for me... However, I will say this, IF you talk to any tyre manuf., They will also tell You, the "Rule of Thumb" with tyre sizes is... Whatever the OEM uses.... They normally will say, you can go Up OR down 1 tyre size...

Hey,.. I'm NOT saying a 190/55 isn't Awesome, Because it IS!.... All's I am saying is... 180/55 rocks too on OUR RC51's and it IS even Better then the 190/50! That's all

Peace Jeff

i was going to dig it up for my own edification. and yes, you can go up or down, but there is an "ideal" size tire for a given rim size. i just went to dunlopracing.com and the 200/55 is designed for a 6" rim whereas the 190/55 is best suited to the 5.5"rim (but it will work on a 6"). but, in following with the pipe cleaner analogy it does flatten out the tire and gives less contact patch while leaned over. i ran the 190/55 209gpA's this year and they were decent, but i am going to be switching to the 200/55 211gpA's for next season.

btw, your spelling tire wrong (unless your from the UK) .

[SubSailor]

This may help visualizing the aspect ratio differences.

[bmfgsxr]

good image sub.... now picture stretching the radius of the 180 tire out to the bottom points of the 190 tire and you will see what happens when you put it on a 6" rim (or roughly thereabouts) as mentioned, even the 190 is recommended to be on a 5.5 over a 6"er..

[James_03_RC]

Originally Posted by RVTMAVERICK

BUT the 180/55 Rocks too... There is nothing wrong with the 180/55....

I also think that the bigger meat will look cool And for the 2ct's, only $25 more then the 180/55...why not

[RVTMAVERICK]

Originally Posted by James_03_RC

I also think that the bigger meat will look cool And for the 2ct's, only $25 more then the 180/55...why not

Hey James,

IF You've got a place that charges ONLY 25 bucks more, for a 190\55 - over the 180\55 JUMP On it! I would too ofcourse.

Just make sure they are NOT quoting You a price for the 190\50...


Peace Jeff

[wingnutt]

One thing NOT to overlook is tire diameter, the power one 190/55 is taller than the 180/55 which is even taller than the pilot power 180/55

So when I went to practice on my new 180/55 power one my bike felt wrong it was like there was nothing in my gloves

The track gurus loaned me some rearset jackstands and had me lower the rear ride height 4 turns and the forks remained at 10 mm above the triples.

I did saturday practice and I had MY bike back I still don't know how to set-up for a 190/55 power one because the clevis is all the way in (ohlins shock with a d/k link) and the swingarm looked too close to the tire with the new chain.

I maybe need to drop the forks to get it

[James_03_RC]

Originally Posted by RVTMAVERICK

Hey James,

IF You've got a place that charges ONLY 25 bucks more, for a 190\55 - over the 180\55 JUMP On it! I would too ofcourse.

Just make sure they are NOT quoting You a price for the 190\50...


Peace Jeff

Yeah, Im getting the prices from STG, Michelin Pilot Power 2CT front & rear combo
120/70 with the 180/55 $226.95
and with the 190/55 $247.95

Now, dont everybody go out and them on back oreder on me, there going to be my birthday present to me in Jan.

[johnyisthedevil]

Originally Posted by wingnutt

One thing NOT to overlook is tire diameter, the power one 190/55 is taller than the 180/55 which is even taller than the pilot power 180/55

So when I went to practice on my new 180/55 power one my bike felt wrong it was like there was nothing in my gloves

The track gurus loaned me some rearset jackstands and had me lower the rear ride height 4 turns and the forks remained at 10 mm above the triples.

I did saturday practice and I had MY bike back I still don't know how to set-up for a 190/55 power one because the clevis is all the way in (ohlins shock with a d/k link) and the swingarm looked too close to the tire with the new chain.

I maybe need to drop the forks to get it

if by drop the forks you mean add a little ride height, I think you may be onto something. if the bike is on the same horizontal plane angularly there shouldn't be be any change in turn in. you may have to carry a slight bit more lean angle for a given corner, but the trade off is you should be able to go in harder on the brakes since the added ride height will transfer more weight to the front under decell. of course that also means that there will be an added propensity to stoppie, but if you are smooth on your inputs that shouldn't be a huge issue.

and fwiw the 180/55 is a great choice, but I still stand by the 190/55 as the best of the three.

[rick1127]

i dont think you can get a road version of the 195/55 only track
and as for the 180/55 once fitted to a 6" it will make the tyre flatter.
and in the good old uk if you have a 180 fitted where a 190 should be and crash you wont get paid out by the insurance.

[James_03_RC]

Originally Posted by SubSailor

This may help visualizing the aspect ratio differences.

Sub, thanks for putting up the pic, with this i can see why the 180/55 and the 190/55 is so much better then the 190/50.

[RG]

Originally Posted by Tcoleman51

190/55 didnt fit on my SP1 it hit the swing arm in the front so i had to put on a 190/50 that fit fine but i think i might go with the 180/55 next time. the turn in on the 190/50 is decent but i do only sprited riding

A Pirelli Rosso Corsa 190/55 fitted just fine on my SP1 - It just fitted!.. Getting rid of my 190/50 is probably on of the best thing I've done on my SP. The bike now turns a lot better and grips a lot better too!!

[mighty max]

I"ll get the 190/55...nice turn in...meaning that the angle of lean is much better.....

180/55...can lean much...

This what i used on the track....

[bigbach03]

I have used both the 190/50 and 190/55 and won't ever ride with anything other than the 190/55. The lean angle and confidence you get from that tire is a world of difference.

[kebo]

will a stock chain and front sprocket with a 42 tooth rear fit a 190/55 tire?