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-   -   After I mounted my Continental Road Attack I noticed something... (http://forums.pelicanparts.com/bmw-r1100s-r1200s-tech-forum/324834-after-i-mounted-my-continental-road-attack-i-noticed-something.html)

powert 01-14-2007 01:07 PM

After I mounted my Continental Road Attack I noticed something...
 
...on the front. There are direction arrows on the sidewall and tread to indicate the direction of rotation. The rear is fine but on the front the direction arrow on the sidewall is pointing in the opposite direction as the arrow on the tread and the tread pattern itself is in the opposite direction as the rear. I think there has been an oops with this and I am going to have to remove and reinstall the tire. Any thoughts or similar experiences?
http://f-22raptor.smugmug.com/photos/122933030-M.jpg
http://f-22raptor.smugmug.com/photos/122933098-M.jpg

wswartzwel 01-14-2007 01:43 PM

The arrow on the side wall is the one you use for front tire rotation.


I have seen this on other brands as well.. Side wall arrow pointing the same on the rear as tread arrow, and opposite on the front. Not sure what the arrow in the tread means. I think it has something to do with the directional forces applied to the tire, and the tread splices in manufacturing.... The front and rear tire forces would be opposite, since the rear tire mostly pushes the bike, while the front has its greatest forces slowing the bike when on the brakes..
Would love to know why they do it, as it can be confusing... Again you use the arrows on the sidewall of the tire for rotational direction.

boxercup 01-14-2007 02:25 PM

Short Explanation
 
Greetings,

There is one short explanation.

Don't do this at home! :-))!

Web find:

Rotation and balance marks
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.

Another mark to look for when mounting a tire is a painted balance dot, or dots. Most tires are pre-balanced by the manufacturer. They will then put a mark on the tire indicating where the valve stem should line up.

mullerjd 01-14-2007 02:30 PM

That's weird.. I've never seen a tire with the writing up-side-down either

ckcarr 01-14-2007 04:21 PM

The Road Attacks are not for amateurs!

Bob Hancock 01-14-2007 04:38 PM

Reference the front tire....either you have a bad one or I have a bad one cos on my Conti Road Attack the arrow on the side and the arrow in the tread go the same direction and both align with the pointy end of the tread. In your case, the arrow in the tread and the tread are properly aligned. The side arrow is pointing backwards. Continental owes you a new tire although you may be able to keep it for a collectors item. Kinda like a two headed coin.

ckcarr 01-14-2007 05:00 PM

Road Attack or Sport Attack?

My road attacks had proper arrows. The Sport Attacks I installed have the same similar reversed arrows.

wswartzwel 01-14-2007 05:05 PM

My Pirellis have reversed arrows too...

http://forums.pelicanparts.com/uploa...1168826703.jpg

tominator 01-14-2007 05:26 PM

You brake with the front and accelerate with the rear...Sportecs are the same weird directional business.

Tomas

powert 01-14-2007 06:19 PM

Quote:

Originally posted by ckcarr
Road Attack or Sport Attack?

My road attacks had proper arrows. The Sport Attacks I installed have the same similar reversed arrows.

Road Attack

On a seperate note what pressure should be a good starting point? The sidewall indicates a max of 42 psi. That seems a little high but I know it can differ between manufacturers.

mullerjd 01-14-2007 06:27 PM

I run 34 34 on all my sprotbikes and so far it's been a great combo.

Bob Hancock 01-14-2007 06:32 PM

I've always ran 34/36 on everything until I got the Conti's. The manufacturer strongly recommends 42/42 which sure seems high. So I've been inching up and now am running 38/40 and the tires do fine...no issues best I can tell. I'm hoping the higher pressures will give better mileage.

Rocklee 01-15-2007 04:59 AM

Got up this morning to post the very same post about the Road Attacks and the differing arrows on the front tire. The tread pattern also makes contact in the reverse when only the sidewall directional arrow is used.

Bob Hancock 01-15-2007 05:15 AM

Quote:

Originally posted by Rocklee
Got up this morning to post the very same post about the Road Attacks and the differing arrows on the front tire. The tread pattern also makes contact in the reverse when only the sidewall directional arrow is used.
This is strange. Both side and tread arrows on my tires point forward, as does the pointy part of the tread when viewed from the top.
PS...go here and look at which way the pointy ends point. This pic tells me they're supposed to both point the same way. Am I right?
http://www.conti-online.com/generator/www/de/en/continental/motorcycle/themes/motorcycletires/sport/sportattack/contisportattack_en.html

Rocklee 01-15-2007 05:24 AM

The rear pattern flow is as the website photo depicts but my front tire (sidewall directional arrow observed) would be opposite.

Bob Hancock 01-15-2007 05:27 AM

Well then one of us has our front tire mounted the wrong way. Like you, I followed the side arrows for both ends, but the front points the same way as the rear....both as the pic at the Conti site.

Rocklee 01-15-2007 05:32 AM

I think mounting a directional tire backwards might be hazardous to my health!

Rocklee 01-15-2007 05:34 AM

Bob, maybe this is a Conti tire construction mishap. I would like to nail this issue down with them as well.

Bob Hancock 01-15-2007 05:34 AM

If what we have surmised is correct, then Conti has messed up. Who did you buy your tires from? Unless this strangeness is sorted out, I've just mounted my last set of Conti Road Attacks.

Rocklee 01-15-2007 05:43 AM

Got mine from Competition Accessories. Powert seems to have the same issue as mine but I'm not sure whether his front tire would roll in the reverse pattern flow in comparison to the rear tire tread flow.


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