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MarkT Exhaust
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Author Topic: Dark side tire opinions  (Read 3471 times)
MarkT
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Posts: 5196


VRCC #437 "Form follows Function"

Colorado Front Range - elevation 2.005 km


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« Reply #40 on: April 23, 2011, 08:48:51 AM »

BTW, Ricky,

If you haven't tried it already - check out a bias-ply rear bike tire on the front.  Several advantages, chief among them these tires typically have more tread as well as rubber twice as thick.  More traction if you sometimes ride where that's needed - like on a wet dirt road.  Lasts twice as long.  Ride a little softer as bias ply tires are typically inflated a little less.  I presently have a Dunlop K491 (also called E-II) but it's discontinued, replaced with D-404 (not sure on the "D")  Just retired a Battlax on the front of the wing - had about 15k on it, and still 5/32 left.  Retired because the sidewall cracked with age still < 5 yrs (from manufacture)  Looks like Jake Wilson is going to warranty it.  Replaced with an Avon A26.  All of these - the steering feels lighter than with the radial tire they replaced.  Not sure on the physics why.

I always wear my back tires down at least past the wear indicators - as long as I'm not about to go on a trip.  Just check them before each ride.
« Last Edit: September 25, 2014, 07:50:15 AM by MarkT » Logged


Vietnam-474 TFW Takhli 9-12/72 Linebckr II;307 SBW U-Tapao 05/73-4
MarkT
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Posts: 5196


VRCC #437 "Form follows Function"

Colorado Front Range - elevation 2.005 km


WWW
« Reply #41 on: April 23, 2011, 09:25:28 AM »


Dfragn - good evenhanded post.  only 4 posts on the count?  Is that a mistake? 

As to MarkT's report well OK that's his take, as well as others. His report structure & verbage for his opinion is his and did seem to have an agenda. It's hard for either side to hide an agenda.

Yeah, I just cut & pasted most of that from several board responses I wrote.  Didn't rewrite it or clean it up or otherwise edit to improve the continuity or eliminate redundancy.  Probably should have.  Those responses were all written in response to some posts raving about the DS. (What peeves me, is posts that rave and aren't balanced, unless somebody pipes up and adds balance.)  If I'm in a hurry, or have other things to do, stuff gets missed.  I did say, several times, a statement of position that the DS might fit your needs, but it's not for me.

Air pressure is the key. Car tires are designed to carry weight loads of 1.5 - 2 tons or more between 4 of them.
If you or anyone decides to experiment with a CT you've got to find your own operable pressure.

I couldn't find an air pressure, with which I could tolerate the handling, from 18 - 40 lbs.

And disagree with MarkT's 20lbs. of force to keep her healed over. I've dragged pegs at 90 mph and can say it doesn't feel much more than 8-10 lbs., a tad less at lower speeds. But we are all of different physiques.


As I said - I didn't measure it, that was a guess - though I still think that is pretty close.  Keep in mind, such pressures probably vary with tire size, inflation pressure, and surely rider weight.  No doubt it would be a lot less if I weighed 140#. I don't - I'm twice that.  It would be a trick to measure - best done with some kind of recording scale in your hand - don't know if that exists. The countersteer pressure was unacceptable to me, whatever it was.

Although when riding in a group of MC tires I appear to be leaning a degree or two towards the high side.

I have noticed, when riding with DS riders, their bike's lean is always the lean of my bike, plus some additional lean to overcome the shoulder of the wide tire.  So in the twisties, their lean movements are mine plus some exagerration.  IOW they are throwing it back and forth more than I am, and dragging iron sooner and harder if we are going that fast.

I got hit by at least a 40 mph wind gust and that combined with the surface took me towards the curb lip and beyond that a 2' drop. Yeah, I 'bout stained my shorts, but I controlled it and didn't move me much more then a foot. MC tires would have been affect too. I estimate around 20% less under those circumstances.

My Valk, with a 200 Cobra, isn't affected much at all by high crosswinds.  Less so than my Explorer.  But that may be relative, as the Wing is positively pummeled by crosswinds - so I get on the Valk, it feels like nothing.
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Vietnam-474 TFW Takhli 9-12/72 Linebckr II;307 SBW U-Tapao 05/73-4
FryeVRCCDS0067
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Posts: 4338


Brazil, IN


« Reply #42 on: April 23, 2011, 07:54:51 PM »

I have been going back and forth between the CT and the bike tires on my valk with most of my mileage on GY TTs. I prefer the increased traction of the CT and the better ride. I for some reason enjoy the increased bar pressure required with the CT and prefer a CT on twisty roads. Both for the increased traction and that the bike naturally stands up at the corner exit just by decreasing the bar pressure. I also greatly prefer a CT for running gravel roads. They seem way more stable to me on gravel and somehow less likely to make the front end push.

That being said, I prefer the way the bike tire doesn't care what the road camber is. I still ride straight up on a badly cambered road with a bike tire but not so with a CT. I prefer not being pushed around by road irregularities with a bike tire like I am when running a CT. Making a U turn on a boat ramp could quickly turn to $hit when running a car tire if you're not used to it. The CT combined with a paved road badly rutted by heavy semis can make it hard to hold your line, in particular when approaching stop signs and red lights. Since I like to keep my feet up till the last possible second and stop as gracefully as possible the occasional awkward stop caused by ruts and car tires pisses me off.

In a parking lot, stopping lengthwise on a pavement ridge between two different levels of slab can cause a tip-over with a bike tire or car tire but I think it's more likely with a CT. However, i think low speed handling in general is better with a CT.

All in all, I prefer a CT. And all in all, motorcycling is inherently unsafe. Some of us reading this thread will probably be killed on our scoots before 2012 no matter what tire we are running.

I'll ride anyway, because I have to, I'm not complete without it and we'll just see where the chips fall I guess. But, make no mistake, none of us ride because we think it's the safest way to get where we are going. We ride because the freedom, thrill and beauty of the ride make the risk worth it.
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"Extremism in the defense of liberty is no vice.
And... moderation in the pursuit of justice is no virtue.''
-- Barry Goldwater, Acceptance Speech at the Republican Convention; 1964
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