New Rear Tire - KTM Duke 390 Forum
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post #1 of 42 Old 06-18-2016, 07:42 AM Thread Starter
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New Rear Tire

My OEM Rosso II was threadbare after 4300 miles (6900km), so I mounted a new Bridgestone S20 Evo on the rear wheel. I am using a 140/70, the same size as all the other (Kawa, Honda, Yam) sub-400cc bikes in the class, which use the same size rim as the 390. This is also the size favored by most of the RC 390 racers. The stock 150/60 does fit on the rim, but has to be pinched such that the profile is distorted and the full contact patch cannot be utilized. Thus, the prevalent "chicken strips". The 390 rim would have to be 1/2 inch wider to fully utilize a 150.

Immediately after fitting the new tire (getting the bead to seat was a bit of challenge), I took the bike for a test drive of about 120 miles on two-lane back roads. The S20 is far smoother in transition and turn-in on curves than the Rosso, but this is not a very fair comparison since the Rosso was badly squared off and down to the wear threads. I can say, however, that the S20EVO is an exceedingly secure-feeling rear tire and seems "natural" on the bike. I do believe that it puts down a bigger contact patch than the distorted OEM Rosso, and seems like a nice upgrade. I am very pleased. The 140/70 is slightly narrower and slightly taller than the Rosso. (The bike now leans at more of an angle on the sidestand and has a little more cornering clearance.)

One unexpected side benefit of the S20 is that it is noticeably more compliant over bumps than the Rosso. Between the new tire and the R6 shock, the bike now passes over the frost heaves that cross the local roads with much less shock and drama than with the Rosso/OEM shock.

Apparently Bridgestone has phased out the S20 EVO in favor of a successor, the S21. The S20 is thus on clearance at many tire dealers and I was able to pick up this tire for $103 on Amazon. It is a lovely, secure and comfortable tire, equal to or better than the stock Rosso II, and certainly sized more appropriately for the rim. How it will wear over distance remains to be seen.
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Cheers, Will

"If you don't know where you're going, you might wind up somewhere else."
--Yogi Berra

2015 390 Duke
1980 Moto Guzzi V50 II (becoming a cafe racer)
1984 Moto Guzzi SP 1000

Last edited by Diploman; 06-18-2016 at 07:47 AM.
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post #2 of 42 Old 06-18-2016, 09:42 AM
Luc
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Thanks for the info Will!
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post #3 of 42 Old 06-18-2016, 10:37 AM
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Let's see your chicken strips now. 🙂

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post #4 of 42 Old 06-18-2016, 01:12 PM
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Is it better than the Metzeler's even though those are the wrong size also.
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post #5 of 42 Old 06-18-2016, 03:38 PM
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I'm also dropping to a 140 when it comes time
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post #6 of 42 Old 06-18-2016, 03:43 PM Thread Starter
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Tim - I have no idea about Metzelers - never used them on any bike.

JW - Chicken strips are disappearing already - and that is just with 65MPH (105kph) cornering on twisty back roads. No hi-speed track use.
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Cheers, Will

"If you don't know where you're going, you might wind up somewhere else."
--Yogi Berra

2015 390 Duke
1980 Moto Guzzi V50 II (becoming a cafe racer)
1984 Moto Guzzi SP 1000
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post #7 of 42 Old 06-18-2016, 06:46 PM
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Might go 140 / 70 too.

Can get a Michelin Pilot street in that size for 58 - I'm sure I paid more than that for a 140/70/17 for my CBR600 in 1991 !

The Pirelli Angel City looked might tempting at 52 - untill I realised it was a cross ply

Less is more - You can only use 150hp .001% of the time, but you can use 150kg 100% of the time ...........


2015 390 Duke / 2001 KTM 640 Duke2 / 1994 DR350 (in bits)
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post #8 of 42 Old 06-18-2016, 11:49 PM
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3500 miles and I'm starting to think I'll be buying a rear tire soon also... Did you pick the Dunlop for value is there anything else you recommend?

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post #9 of 42 Old 06-19-2016, 09:10 AM Thread Starter
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JW, I chose the Bridgestone S20 EVO (not Dunlop) on the basis of comparative tests such as this one from Motorcylist Magazine, evaluating sport tires for small bore sportbikes (using an RC390).

https://www.youtube.com/watch?v=bHnmukUJ7aQ

The fact that the S20 evo was on sale at a very attractive price was another incentive.

For my style of riding, which does not involve high-speed, high intensity track use, I think a true sport tire might be a bit of overkill - probably I would be better served by a sport-touring tire. But the latter tend to be expensive and it is hard to find a sport-touring tire in a 140 size. Anyway, I love the grip of the S20 evo, even if my expectations for mileage cannot be higher than for the Rosso II.

Cheers, Will

"If you don't know where you're going, you might wind up somewhere else."
--Yogi Berra

2015 390 Duke
1980 Moto Guzzi V50 II (becoming a cafe racer)
1984 Moto Guzzi SP 1000
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post #10 of 42 Old 06-19-2016, 01:24 PM
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Quote:
Originally Posted by Diploman View Post
JW, I chose the Bridgestone S20 EVO (not Dunlop) on the basis of comparative tests such as this one from Motorcylist Magazine, evaluating sport tires for small bore sportbikes (using an RC390).

https://www.youtube.com/watch?v=bHnmukUJ7aQ
thanks for the video - that's put me off the Michelin then. I knew grip would be down on the Rosso 2, but worse than IRCs?

Think I might go Continental ContiMotion M (140/70 & 150/60 sizes available) - it's classed as a sport touring tyre
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Less is more - You can only use 150hp .001% of the time, but you can use 150kg 100% of the time ...........


2015 390 Duke / 2001 KTM 640 Duke2 / 1994 DR350 (in bits)
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