Author Topic: Bias and radial tires  (Read 8079 times)

Offline buzzcut

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Bias and radial tires
« on: May 14, 2011, 03:07:43 pm »
Hi all  When I bought m yconnie 3 years go, it apparently had a radial front and bias rear.  did not notice until I had to change the front.  No issues that I noticed.  I've been riding for over 30 years  so its not like I'm ignorant with handling.  Now, this seems to be a sacred cow that nobody has been able to explain suitably to me.  anybody with the know, please pipe up.  Why can't we mix Bias and Radial?  Lots of conjecture, no hard knowledge.  My real world experience says 'No big deal"

thanks

Offline T Cro ®

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Re: Bias and radial tires
« Reply #1 on: May 14, 2011, 04:34:39 pm »
Why can't we mix Bias and Radial?

Because tire manf must cover their ass due to safety aspects that's why....... It has been done both ways time and time again; heck even BMW did it straight from the factory. But that does not make it right 100 percent of the time as there have been and could be some serious issues when certain tires are mixed together.

You real world experience is correct that most of the time it is no big deal. My brother used to love the Met ME33 Bias Lazer in the front of his BMW's with almost any brand of Radial in the rear; and he could ride the dog stink out of his bikes.
Tony P. Crochet
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Ask me about a set of Stick Coils & Harness or Precision Shift Linkage for your C10 Concours

Offline DeansZG

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Re: Bias and radial tires
« Reply #2 on: May 14, 2011, 07:52:53 pm »
+1...yep, no big deal!
Ran a couple of radial front / bias-ply rear sets for well over 20k miles combined.....
'99 C10 "MissTriss" *sold*
'04 ZZR1200 "Sweet heart" *sold*
'81 GL1100 Interstate "Puttz"*sold*
'00 K12LT..."Battleship Galactica".....

Offline Viking

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Re: Bias and radial tires
« Reply #3 on: May 14, 2011, 09:53:19 pm »
Had never heard about the taboo until quite a few years ago when I changed the front tires on a small car.
The rear tires were bias ply, the new fronts were radial.
That damn thing was squirrely as hell.
Felt like I was in a high cross wind and wouldn't track worth a damn.

Took it in to a local shop, and the mechanic wanted to know who mismatched the tires.
He said it's illegal to mismatch radials and bias ply.
That was the first time I'd ever heard such a thing.
Never gave it anymore thought after that.

This was my only experience with a mismatch, and don't forget it was a car.
No idea what the difference would be on a bike.

Offline Cybercraig

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Re: Bias and radial tires
« Reply #4 on: May 14, 2011, 10:47:39 pm »
I hear the same thing about profiles too. If you run a 60 on the back run a 60 on the front. If you run a 70 series on the front run a 70 series on the back. It makes sense that you would be optimal in canyon carving but is it critical? Nope.
'98 becoming more farkled up by the minute.


R.I.P. Steve Earl  "Mr. FJR"

Offline T Cro ®

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Re: Bias and radial tires
« Reply #5 on: May 15, 2011, 04:06:25 am »
I hear the same thing about profiles too. If you run a 60 on the back run a 60 on the front. If you run a 70 series on the front run a 70 series on the back. It makes sense that you would be optimal in canyon carving but is it critical? Nope.

That one does not fly as bike comes factory with an 80 in the rear and a 70 in the front; most bikes run two entirely different profiles. My bike with its 17" conversion has a 60 in the rear and a 70 in the front and it handles wickedly sweet.
Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010
Ask me about a set of Stick Coils & Harness or Precision Shift Linkage for your C10 Concours

Offline gpzrocker

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Re: Bias and radial tires
« Reply #6 on: May 15, 2011, 04:13:24 am »
I believe that Harley also has ran a bias/radial combo for many years also.

Just make sure the radial is on the front, at least in my experience. Bias front and radial rear: yikes. Was not awe inspiring.

My next set of tires may be the Shinko 011 front and their bias rear, but that will be next year.

Offline T Cro ®

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Re: Bias and radial tires
« Reply #7 on: May 15, 2011, 04:20:26 am »
I believe that Harley also has ran a bias/radial combo for many years also.

Just make sure the radial is on the front, at least in my experience. Bias front and radial rear: yikes. Was not awe inspiring.

Actually I believe that BMW did it the other way around but I could be mistaken; to which my brother loved a bias ply in the front and a radial in the rear on his RT 11XX series bikes.
Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010
Ask me about a set of Stick Coils & Harness or Precision Shift Linkage for your C10 Concours

Offline Outback_Jon

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Re: Bias and radial tires
« Reply #8 on: May 15, 2011, 08:01:05 am »
I'm currently running a radial front (Shinko 757) and bias rear (Shinko Tourmaster) with no ill effects.  Scraped a good amount of rubber off the toes of my boots on a ride on Friday.  I had wanted to go with the 757's on both ends, but they didn't have the rear available last year. 

So far, the biggest thing I avoid in tires is any model that has a groove right at the center of the tread.  Too many steel deck bridges and grooved pavement areas around here.  THAT gets squirrelly.
"Outback Jon" Gould *** South Cairo, NY *** COG #9506 *** 2006 C10 "Blueline" *** CDA #0157

Offline gtr1000

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Re: Bias and radial tires
« Reply #9 on: May 15, 2011, 09:12:28 am »
Hopefully I'll find a bit of time next week to re-write the post I wrote before the crash on the Azaro dual compound rear I've been testing for Avon GB  ;)
Paul OTP (near Windsor, GB).

06 C-10, 2009 to .....
A5 C-10, 2000 to 2009.

Offline DaveO430

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Re: Bias and radial tires
« Reply #10 on: May 15, 2011, 07:27:31 pm »
I wouldn't be a bit afraid of it. I run a bias rear tire on the front of my goldwing with a radial car tire on the rear and haven't found anyone yet (short of a sport bike) that can hang with me in the twisties.

Offline Viking

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Re: Bias and radial tires
« Reply #11 on: May 15, 2011, 09:27:49 pm »
I wouldn't be a bit afraid of it. I run a bias rear tire on the front of my goldwing with a radial car tire on the rear and haven't found anyone yet (short of a sport bike) that can hang with me in the twisties.

Did anyone else duck for cover when they read this?
Gonna grab some popcorn and see who bites.

Offline T Cro ®

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Re: Bias and radial tires
« Reply #12 on: May 15, 2011, 09:32:14 pm »
Did anyone else duck for cover when they read this?
Gonna grab some popcorn and see who bites.

Not me... If he says he can I'll not call him a liar or a fool....

Lots of big bikes work good with a rear tire on the front as they last so much longer and Dark Siders have been around too long to be completely wrong; it ain't for me but it works.
Tony P. Crochet
(SOLD) 01 Concours Winner of COG Most Modified in 2010
Ask me about a set of Stick Coils & Harness or Precision Shift Linkage for your C10 Concours

Offline Two Skies

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Re: Bias and radial tires
« Reply #13 on: May 15, 2011, 09:49:14 pm »
And, there are at least two C10 Connies out there who have darksided on us.  I've considered it too, except that the suggested tire was a bit expensive.  Plus the Pilot GT's were awesome!

Of course, with what I paid for that Venom rear...

We haven't heard from the one CT guy lately.  Last I heard, he'd found a 17" car tire he was using for the 17" rim he had mounted on his connie, but that's been well over a year now...
2006 w/50,000+ miles and a few bruises.

MCL Fork Brace & Handlebar Risers.  Bergmen Quick Release Tank Kit, Pilot GT Front/Avon Venom Rear tire.  Trunk w/spoiler.  NGK DR8EIX plugs.  Piece of foam in airbox.  Beads on seat.  Bafflectomized.  Murphs Kneesavers & Fuse Block.  Cee Bailey Winscreen w/vent.  Heated grips.  'Custom' mirrors.

Offline Uglydog56

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Re: Bias and radial tires
« Reply #14 on: May 16, 2011, 01:14:09 pm »
I'm currently halfway through a 17" conversion and currently have a 170/60 roadsmart (radial) on the back and a 110/80 avon roadrider on the front (bias).  I can touch the pegs on an onramp, no issues in the rain either.  I am not recommending this, but I did it and I didn't die.
Rick A. Cone
COG #9186
98 Connie, 76 CB400F