I'm thinking about going to a 190/55 tire (5.75" rim) which obviously has a larger radius (5.5 mm).
How much larger does a tire radius become at top speed? (my bike at 155 mph)
Theoretical clearance issues are with swingarm and DP hugger......
[beer]
Don't do it. ;D
Quote from: humorless dp on January 08, 2011, 02:46:34 PM
Don't do it. ;D
Don't do what - top speed, larger tires, drink beer [cheeky]
Quote from: stopintime on January 08, 2011, 02:49:48 PM
Don't do what - top speed, larger tires, drink beer [cheeky]
Larger tire.
The bike doesn't need it.
ahhh but it may [evil]
Quote from: Raux on January 09, 2011, 04:11:13 AM
ahhh but it may [evil]
Be that as it may 8) , but I'm really just trying to choose the best tire for my riding.
The 5.75" rim is somewhere in the middle of typical 180 (5.5) and 190 (6.0) rims - I've been told it's down to personal preference.
I have no tire experience other than from stock to SportTec M3.
My riding requires a rounder tire than a 190/50, so I'm going to try a 190/55 if it isn't too large for swing arm clearance.
The position of the eccentric hub means a lot too - if my new 15/44 gearing puts the eccentric at 8 or 9 o' clock, I might be in trouble with a 190/55. There is also the hugger to consider.
From other sources I've been told that a 1098R race ream run any gearing/eccentric position that will maintain
a 5 mm tire/swingarm clearance.
Quote from: Raux on January 09, 2011, 04:11:13 AM
ahhh but it may [evil]
He can do what he wants...
but all a 190 tire on his 800 will do is slow down the handling
Quote from: humorless dp on January 09, 2011, 04:57:09 AM
He can do what he wants...
but all a 190 tire on his 800 will do is slow down the handling
and after all the suspension work he did to increase the handling and stability... good point.
With my mods and my size/weight I have few problems flicking my bike - if I'm active ;)
I think I'm in a totally different position than a "stock" size rider, riding passively on a stock bike.
With that in mind, I'm not afraid of a "slower" tire. If I don't like it I can change back at the next tire change.
I can't not do my best to find out the differences....
My reasons for a change:
possibly better suited for the rim dimension
possibly a little more traction
cool factor
To answer your question, the only tires I was aware of growing appreciably were some of the older Dunlop race tires.
The newer ones were changed. They found the tire growing affected the handling in a bad way on race bikes. ;)
Interesting. What wheels are you running that are 5.75"? My thoughts are that if you run a 180 on a wider than ideal rim, such as you are doing, you will get a flatter tire. Am I wrong on this? Because of this, if you wanted a rounded, more aggressive tire, I would think that you have to run a 190/55. Maybe I'm wrong but that's my interpretation.
Quote from: hackers2r on January 09, 2011, 07:11:40 AM
Interesting. What wheels are you running that are 5.75"? My thoughts are that if you run a 180 on a wider than ideal rim, such as you are doing, you will get a flatter tire. Am I wrong on this? Because of this, if you wanted a rounded, more aggressive tire, I would think that you have to run a 190/55. Maybe I'm wrong but that's my interpretation.
I think you're right, but either tire will work on that rim.
Quote from: stopintime on January 09, 2011, 04:40:38 AM
~~~SNIP~~~
From other sources I've been told that a 1098R race ream run any gearing/eccentric position that will maintain
a 5 mm tire/swingarm clearance.
I was thinking 1/4" of growth would be about all you *might* see.
Quote from: Speeddog on January 09, 2011, 10:49:59 AM
I was thinking 1/4" of growth would be about all you *might* see.
You're close enough to deserve a beer [beer] Nate - take care of that, will you?
Metzeler answered quickly, but not quite fully....
* Diameter at maximum speed 652 mm* (320 km/h)(190/55)
So, a little math follows...
17" x 2.54 ............432 mm
+ 190 x 55% x 2 .........209 mm
= 641 mm
If this is real world correct measurements for an inflated standstill tire,
then,
the "dynamic growth" is 5.5 mm (diameter 11 - radius 5.5)
Subtracting a couple of mm for my not-quite-320km/h top speed,
and,
adding the 5.5 mm from tire size change
= no problem (unless the eccentric hub is at ~8 o'clock - maybe not even then)
I'm still waiting for Metzeler to confirm that a 190/55 tire is actually 104.5 mm high when inflated and at a standstill.
Does this sound right to y'all y'all?
for dunlops and other tire fitment to rims you should consult a tire professional. the guy who works at a dealership or shop chances are is not a professional tire guy. for dunlop contact sportbike tire services and for michelin i would contact sport bike track time and link to their michelin page. heres a link to dunlop.
http://dunlopracing.com/ (http://dunlopracing.com/)
btw i would stick with a 180 [bacon]
Quote from: humorless dp on January 09, 2011, 05:44:17 AM
To answer your question, the only tires I was aware of growing appreciably were some of the older Dunlop race tires.
The newer ones were changed. They found the tire growing affected the handling in a bad way on race bikes. ;)
those grew alot, the fronts still grow enough to make a carbon fender explode if you don't space it well enough, speeking from experience here. lol [bacon]
Quote from: atomic410 on January 10, 2011, 10:57:50 AM
those grew alot, the fronts still grow enough to make a carbon fender explode if you don't space it well enough, speeking from experience here. lol [bacon]
My Power One V has pretty much destroyed my front fender.
No explosion, just a gradual chew.
A couple of people (me included) have noticed that Dunlop's Sportmax Q2 180/55 appears much wider than the same sized tyre by other manufacturers. Some discussion on the subject here >> http://www.ducatimonsterforum.org/index.php?topic=45162.msg822827#msg822827 (http://www.ducatimonsterforum.org/index.php?topic=45162.msg822827#msg822827) << A 180 that thinks its a 190? ;). Maybe that would provide the compromise you're looking for??
I have a new (unmounted) 180/55 Dunlop Q2 which I can measure for you if thats any help....