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Old 07-04-2013, 09:19 AM   #1
lbyvik OP
Ummmmm?? REALLY?!
 
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tire..rear to front question

Hey guys..

I'm on a four corners trip on my '93 K1100 LT....Virginia to Quebec City to Key west to Sandyeggo to Vancouver and home...Im in Pensacola right now and need a new front tire...The folx im staying with have a new, 110/90-80, marked as a rear tire....he's going to give it to me which would save me some serious coin. $150 is like 10 fill-ups (about 1600-2000 miles of travel) and being a teacher that is significant for me.

So two questions....

1) It appears the tire height shouldn't be a problem. 90 vs the spec'd 80...so should it fit?

2) What "real" difference is there between front and rear?

Seems to me as long as the tire fits the rim properly, then into the frame and fork properly there should not be an issue. Mind you, I like the twisties but I'm no where near as aggressive as the olden days.

The tire is the Shinko 712 street/cruiser. Before some of you flame on me about shinko's....I run the 705 series on my KLR and get as good as or better mileage out of them than the metzlers and Conti's I was running and have NEVER had a single issue with them....so I'm happy with them...

Also I have a Metzler Lazer on my K11 right now and only got 6000 miles out of it (80% highway) and am VERY disappointed by that.
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Old 07-04-2013, 09:29 AM   #2
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Offroad tires are a whole different story from street tires. I wouldn't recommend a Shinko to my exwife. The size is fine , although it will slow your steering slightly being a taller tire. The tread pattern front and rear are opposite , so put the direction arrow backwards.
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Old 07-04-2013, 09:42 AM   #3
lbyvik OP
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Quote:
Originally Posted by joexr View Post
Offroad tires are a whole different story from street tires. I wouldn't recommend a Shinko to my exwife. The size is fine , although it will slow your steering slightly being a taller tire. The tread pattern front and rear are opposite , so put the direction arrow backwards.
Great thanks! I sorta thought that about the handling..but Im running mostly interstate and some secondary roads....so that shouldnt be a big deal.

I know! I know! re the shinko's! I hear that all the time...except that I've run the Podiums on my SV650 on the track with excellent performance....and I was surprised at how many guys were running some version of them at Summit Point....

I've never had a delam, crack or other issue with them...My $300 Conti peeled after about 300 track miles and 500 road miles....WTF???
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Old 07-04-2013, 09:43 AM   #4
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90 won't work and will rub against the fork brace.

If you REALLY want to run a 90 then you can use washers on the fork brace bolts to shim the fork brace up a tad.

Edit: And I wouldn't put a rear on the front either. Tread designs are different.
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Old 07-04-2013, 09:44 AM   #5
lbyvik OP
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Originally Posted by duck View Post
90 won't work and will rub against the fork brace.

If you REALLY want to run a 90 then you can use washers on the fork brace bolts to shim the fork brace up a tad.
Crap! I was afraid it would be tight.....

hmmmmm??
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Old 07-04-2013, 10:06 AM   #6
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The free tire will be about 11mm (about 1/2") taller than stock so it probably won't clear the fender as was said....(90% of 110 mm vs. 80% of 110mm)....
check out http://www.avontyres.com/motorcycle/roadrider to get an idea on the size difference, the Roadriders come in both.

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Old 07-04-2013, 10:30 AM   #7
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I'm thinking it's 5mm on top,10 overall. :) happy 4th started early.
I have been running shinko's on my last three bikes
Run the canyon to the edge of the tread.
Used them on a gs550,a sv650, and now on my bonneville.
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Old 07-04-2013, 10:32 AM   #8
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Shinko 712 is a $60 tire. Personally I wouldn't consider running a tire that does doesn't fit correctly unless I didn't have a choice.

Your trips sounds amazing, and I would want the bike well-sorted to do it.
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Old 07-04-2013, 11:05 AM   #9
joexr
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Quote:
Originally Posted by doxiedog View Post
I'm thinking it's 5mm on top,10 overall. :) happy 4th started early.
I have been running shinko's on my last three bikes
Run the canyon to the edge of the tread.
Used them on a gs550,a sv650, and now on my bonneville.
11mm of sidewall height from rim per side. About 3/8''.
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Old 07-04-2013, 11:06 AM   #10
CycleDoc59
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The 712 is a good choice for old K bikes. The
110/90-18 is 10mm wider (5mm each side) than a 100, but pretty
much the same height. If it clears ok, and you mount it
backward, it should do just fine.... (tire friction is reversed on
the front, so a rear tire mounted on the front should be reversed)
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Old 07-04-2013, 11:14 AM   #11
joexr
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Quote:
Originally Posted by CycleDoc59 View Post
The 712 is a good choice for old K bikes. The
110/90-18 is 10mm wider (5mm each side) than a 100, but pretty
much the same height. If it clears ok, and you mount it
backward, it should do just fine.... (tire friction is reversed on
the front, so a rear tire mounted on the front should be reversed)
Same width , 10% taller profile. First # is width , second # is sidewall height percentage of width. 110/90 is 90% as tall as its width.Look it up.
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Old 07-04-2013, 12:04 PM   #12
Bigger Al
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The bias of the fabric plies on a rear tire are designed to absorb the forces of acceleration, while the plies of the front are designed to absorb the forces of heavy braking. Hence, if you really must run that tire, then install it reverse rotation from the rear.
Another thing to consider is the age of the tire. Check the DOT code for that info.
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Old 07-04-2013, 12:08 PM   #13
CycleDoc59
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Quote:
Originally Posted by joexr View Post
Same width , 10% taller profile. First # is width , second # is sidewall height percentage of width. 110/90 is 90% as tall as its width.Look it up.

Yep, I was looking at K100 specs..! Thanks.

Anyway, the height of a 110/90 from the bead seat to
the tread top is 7.77", and a 110/80 is 6.91"

So, 18" (rim size) plus 7.77" = 25.77" D for 90 profile
and 18" plus 6.91 = 24.91" D for 80 profile. A total height diff of
.86", or .43" at the top, and .43" at the bottom; about 11mm
more room needed in the fender.

More here: http://www.stevenott.com/tyresizes.htm
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Old 07-04-2013, 12:11 PM   #14
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Quote:
Originally Posted by joexr View Post
Same width , 10% taller profile. First # is width , second # is sidewall height percentage of width. 110/90 is 90% as tall as its width.Look it up.
Not exactly true. Going from an 80 to 90 aspect ratio means the 90 tire is 12.5% taller than an 80.

(90-80)/80

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Old 07-04-2013, 12:28 PM   #15
joexr
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Not exactly true. Going from an 80 to 90 aspect ration means the 90 tire is 12.5% taller than an 80.

(90-80)/80
Right you are , but I still made my point. I should have said 10% of the 110mm width.
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