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Old 05-27-2009, 12:38 PM   #1
The Griz OP
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F800GS TKC80 front wheel question...

I'm looking at the front wheel on the F800GS, and it seems to me that if I start getting some cupping and wanted to even out the wear on my front TKC80 I could simply remove the front wheel and flip it, and reinstall it. Is this true? Will I screw something up doing so?

P.S. No, I don't need to worry about ABS because I didn't get mine with it!
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The Griz screwed with this post 05-27-2009 at 02:26 PM
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Old 05-27-2009, 02:50 PM   #2
johngil
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I flipped mine @ about 3,000 miles. Things got quiet again.
I did re-mount the tire. Are you under the impression that you can simply flip the wheel? I could swear the spacer/bushings are different from side to side.
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Old 05-27-2009, 05:35 PM   #3
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Quote:
Originally Posted by johngil
I flipped mine @ about 3,000 miles. Things got quiet again.
I did re-mount the tire. Are you under the impression that you can simply flip the wheel? I could swear the spacer/bushings are different from side to side.
Yeah. Aren't the spacers and bushings separate pieces from the wheel itself?
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Old 05-28-2009, 01:49 PM   #4
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Griz, tire yes, wheel no. Grease that seal while you have it out too.
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Old 05-28-2009, 02:18 PM   #5
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Quote:
Originally Posted by DockingPilot
Griz, tire yes, wheel no. Grease that seal while you have it out too.
Sweet. Good to know! Thanks!
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The Griz screwed with this post 09-30-2009 at 09:42 AM
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Old 09-30-2009, 09:41 AM   #6
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Those of you who have flipped a front 90/90-21 TKC80 due to cupping, are things still ok? Any problems? The reason I asked is because I just called my local shop and asked if they would do that for me. They said no because "the belt is designed to rotate one way." He also said "the belt could then come apart inside the tire if you run it flipped." If you guys are running flipped TKC80's to combat cupping without any problems, I'll do it. But please chime in here guys, as I don't want a front end blowout while riding the freeway! Thanks!
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Old 09-30-2009, 11:17 AM   #7
EnderTheX
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The tires are directional and I personally would not risk it.

I haven't had experience flipping directional tires but I have accidentally put a few buffing and grinding wheels on backwards... These begin to literally explode during normal use.

There is probably a good reason it is directional, the reason the tire knobs cup is because it sees forces in predominantly one direction (from coasting and braking).
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Old 09-30-2009, 11:27 AM   #8
EnderTheX
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Ok, I was intrigued by the need for directional tires on a motorcycle so I did some research. Came up with this from the American Motorcycle Association:

Quote:
One of the more critical marks on a motorcycle tire is the rotation arrow, or arrows. Today's specialized tires generally have a tread pattern that must go in only one direction. Some manufacturers even state that their tread patterns are designed to disperse water, and by mounting the tire backwards, they won't work.

The other big reason for noting wheel direction has to do with the manufacturing process. The tread rubber is initially a flat strip that's cut to length, at an angle, and then spliced together with the two ends overlapping, creating a hoop. Under acceleration, a tire mounted backwards will try to peel back this splice. The opposite is true for the front wheel, where directional forces are reversed under hard braking.
from here : http://www.amadirectlink.com/roadrid...resc/tires.asp
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Old 09-30-2009, 11:52 AM   #9
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Thanks, man. Anyone else have any thoughts? I'm leaning towards flipping it. Given the fact that the tread pattern on the TKC80 is definitely not directional.

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Old 09-30-2009, 12:16 PM   #10
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I know it's been discussed in GSpot.
I've never done it. Good info above about the process of creating the tire.
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Old 10-01-2009, 08:01 AM   #11
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johngil? Docking Pilot?
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Old 10-01-2009, 08:20 AM   #12
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I prefer an A-cup :-)

To help reduce Cupping and premature wear

Increase the PSI when riding on pavement to somewhere near two-up specs.


low tire pressure elongates the tire (it does not make it wider) creating more surface area. More surface area means more friction (which is great off road) but reduces tire life severely.

I run on dry road
34 Front
41 Rear


I can still drag peg, and I get about 7000 miles out of a rear tire, 10k out of the front.
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Old 10-01-2009, 12:17 PM   #13
Byrdman
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Quote:
Originally Posted by Maddaddy
I can still drag peg, and I get about 7000 miles out of a rear tire, 10k out of the front.
With TKC80's?
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Old 10-02-2009, 02:30 AM   #14
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I have run Avon Gripsters and Distanzia's backwards for the life of the tire with no ill effects and ran them in wet, as I'm sure others here have too. In fact I remember the Gripster being mounted at a Reputable dealer on my KLR backwards from the start and 16000kms later no bad results.
I will be turning my E09's backwards soon for this very reason, maybe today actually. So, stupid question but what if the tire is bias ply, do you guys stick to the same conclusion?
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Old 10-02-2009, 09:15 AM   #15
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Mine isn't cupped yet, so haven't had to cross that bridge.

I ran the IRC GP-110 front tire backwards on my KLR with no ill effects. If/when I swap my front TKC around, I'd reduce sustained speeds to below 80 and make sure there's good air pressure while on the highway to prevent heat build-up.

I've read that hard use of the front brake exacerbates cupping so I've been avoiding that to see what happens. 2.5k miles on the front TKC and no evidence of cupping...yet.
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