Technical Discussion Topics related to Technical Issues

55 vs 50 series rear tire?

Old 12-18-2016, 08:42 PM
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55 vs 50 series rear tire?

So shopping again for a rear tire. I found a great deal on a 190/55 instead of a 190/50 like I am running now.

5mm of sidewall cant cause that much mayhem can it? Anyone have any hands on experience?
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Old 12-18-2016, 08:55 PM
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Yeah, remember nath? If you search I'm sure it'll come up. He was a big proponent... Used to get in some good discussions.
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Old 12-18-2016, 08:58 PM
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I just read up on the interweb about it. Seems like all positive reviews and the one I found was a great deal. $112 to my door for a Dunlop roadsmart 2.

Reviews to follow. I expect quicker turn in at least.
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Old 12-18-2016, 08:58 PM
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55 vs 50 series rear tire?-tire-pro.jpg

I've been researching info on the 190/55 vs. 190/50 because the previous owner of the Duc has a 50 on it, but OE is 55.
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Old 12-18-2016, 09:02 PM
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Shoot, I guess all Nath's arguments were 180 vs 190. I jumped the gun on my reply. Most of what I've read on the Duc forum has noted slower turn in on the 50. It's all I've known to this point but next season I will go back to the 55.
EDIT: also comments that you get to the edge of the tire sooner(on the 50). Not my experience but a general consensus over on the other board.

Last edited by Wolverine; 12-18-2016 at 09:06 PM.
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Old 12-18-2016, 09:02 PM
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Seems the wave of the future.
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Old 12-18-2016, 09:15 PM
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55 Shouldn't be a problem, it may change the speeding read a tiny bit, that's all.
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Old 12-18-2016, 09:18 PM
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EDIT: also comments that you get to the edge of the tire sooner(on the 50). Not my experience but a general consensus over on the other board.[/QUOTE]

That really depends on the tire profile if it's more rounded of more aggressive oval and the manufacturer, they have some variations even if it's the same specs.
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Old 12-18-2016, 09:48 PM
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I know on the track that the bigger size tends to triangulate the tire slightly which means greater mid corner stability and grip at the loss of turn in stability.

Not going to be a factor in January commuting through NYC.
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Old 12-19-2016, 06:09 AM
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Originally Posted by smokinjoe73 View Post
Not going to be a factor in January commuting through NYC.
Knowing that Joe means on a bike, it's a sentence that may have never been spoken before.
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Old 12-19-2016, 06:44 AM
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Tire Aspect ratio is not a direct measurement.

Originally Posted by smokinjoe73 View Post
So shopping again for a rear tire. I found a great deal on a 190/55 instead of a 190/50 like I am running now.

5mm of sidewall cant cause that much mayhem can it? Anyone have any hands on experience?
Not 5mm difference, 7.5mm if it matters to you.
The "50 or 55" is the aspect ratio between width and sidewall not a direct measurement.
190/50 ...the sidewall is 50% of the tire width so 75mm tall.
190/55... the sidewall is 55% of the tire width so 82.5mm tall
all of that ONLY if the tire is mounted on a recommended rim width ... Change the rim width (like when a wider tire is mounted on a narrower rim then recommended..a common mistake) the effective sidewall height will increase, and the width will sometimes decrease.
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Old 12-19-2016, 06:57 AM
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I am willing to test it, since its already ordered. I have a backup rear rim with a Dunlop Q3 on it. The preferred tire for half wet half dry on the racetrack. I feel like its too hard to be good in winter.

I rode only race takeoffs for years in NYC winters but had a few close calls with slides front and rear so switched to the roadsmarts.

My only concern now is swingarm clearance.
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Old 12-19-2016, 11:59 AM
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Originally Posted by smokinjoe73 View Post
I just read up on the interweb about it. Seems like all positive reviews and the one I found was a great deal. $112 to my door for a Dunlop roadsmart 2.
where is said deal?
my 1098 came with the oe 190/55. when it wore out i replaced it with a 190/50. that was a long time ago and i do not recall the handling difference. either i have a bad memory, the difference was insignificant, or my riding skills are too obtuse to be able to notice. i lean to the latter as i do recall wider chicken strips on the 190/55. lol
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Old 12-19-2016, 12:13 PM
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Originally Posted by E.Marquez View Post
Not 5mm difference, 7.5mm if it matters to you.
The "50 or 55" is the aspect ratio between width and sidewall not a direct measurement.
190/50 ...the sidewall is 50% of the tire width so 75mm tall.
190/55... the sidewall is 55% of the tire width so 82.5mm tall

Or, it's 9.5mm difference if you're not using common core math.


Or, 5.5mm more than stock. Still not using common core.

Last edited by E.Marquez; 12-20-2016 at 05:26 AM. Reason: No edit made
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Old 12-19-2016, 06:55 PM
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Originally Posted by VTR1000F View Post
Or, it's 9.5mm difference if you're not using common core math.


Or, 5.5mm more than stock. Still not using common core.
I hate typos ...
180/55-17 STOCK = 99mm high sidewall
.
190/50-17 Tire he is running NOW 95mm sidewall or 4mm LOWER than stock
.
190/55-17 Tire he is wanting to run 104.5mm or 5.5mm Taller than stock or 9.5mm Taller than what he is running now.

Last edited by E.Marquez; 12-20-2016 at 05:27 AM.
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Old 12-19-2016, 06:57 PM
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My speedo is off a good 8mph. Hate that even though I know it.
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Old 12-19-2016, 06:58 PM
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Originally Posted by Wolverine View Post
My speedo is off a good 8mph. Hate that even though I know it.
V4 speedo healer
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Old 12-19-2016, 09:37 PM
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So a 190/55 has to be larger circumference than stock right? No matter what?

Here is where I bought it.

190/55ZR-17 Dunlop RoadSmart II Sport Touring Radial Rear Tire | eBay
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Old 12-19-2016, 09:55 PM
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Originally Posted by E.Marquez View Post
I hate typos ...
180/55-17 STOCK = 99mm high sidewall
.
190/50-17 Tire he is running NOW 95mm sidewall or 4mm LOWER than stock
.
190/55-17 Tire he is wanting to run 104.5mm or 5.5mm Taller than stock or 9.5mm Taller than what he is running now.
Try again.

Just being a dick. That last one should be "TALLER" & "taller".

Last edited by E.Marquez; 12-20-2016 at 05:26 AM. Reason: edit, what edit
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Old 12-19-2016, 10:05 PM
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Originally Posted by smokinjoe73 View Post
So a 190/55 has to be larger circumference than stock right? No matter what?

Here is where I bought it.

190/55ZR-17 Dunlop RoadSmart II Sport Touring Radial Rear Tire | eBay
Yes, an approximately 34.6mm larger circumference than stock.
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Old 12-19-2016, 10:15 PM
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I was reading here
https://www.tacomaworld.com/tirecalc...5r17-190-55r17

I own a speedo healer but never put it on. It is offset by gearing as well so there is a break even point. Plus 1.7% is way off little to care. I don't ride where speed matters much.
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Old 12-20-2016, 05:41 AM
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The 1.7% difference (with stock gearing) would make the speedo more accurate.
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Old 12-20-2016, 09:08 AM
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Yeah, but if you are going 100 and it says 101.7, do you care?
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Old 12-20-2016, 02:40 PM
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Originally Posted by smokinjoe73 View Post
Yeah, but if you are going 100 and it says 101.7, do you care?
Inquiring minds want to know!
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Old 12-20-2016, 04:05 PM
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Originally Posted by smokinjoe73 View Post
I don't ride where speed matters much.
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Old 12-20-2016, 08:11 PM
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Where Joe's riding, he don't need roads.
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Old 12-20-2016, 08:34 PM
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I really wouldn't advise that tire for winter snow/ice conditions... It's unsafe. You have a kid to think about now, changes everything.
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Old 12-20-2016, 08:45 PM
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Roadsmarts are actually highly rated for bad weather. High silica compound. I used to ride only race take offs (aforementioned). This is a big step up.
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Old 12-21-2016, 06:22 AM
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For those really Bad Days

Smoking's bad weather tire.
Attached Thumbnails 55 vs 50 series rear tire?-img_0768.jpg  
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Old 12-21-2016, 06:27 AM
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I actually thought of making some of those for icy days but figured they would self destruct if I wound up on pavement for any length of time.
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