Suspension-- Tire wear issue - Page 2 - Sportbike Addicts

Drew13 · 08-25-2008, 08:29 PM

Saw this posted on this site. The second one is my tire!! So it says:

SHOCK SPRING TEAR
When the shock spring is too soft or too hard, the tire carcass is put under extreme duress to the point where the tire shreds and melts. This can be determined by measuring sag to see if the target number cannot be reached firstly, without considerably adding preload to the spring or secondly, if all the preload is off the spring.

Now what does that mean? haha.

RCM78 · 08-26-2008, 11:45 AM

http://www.sportrider.com/tech/146_0308_geek/index.html

CORNBREAD · 08-26-2008, 12:47 PM

The link rcm provided is a great resource.

WCW will always get my business. Not only are they knowledgable but great guys as well.

FDNYDANO18 · 08-26-2008, 12:47 PM

Quote:

Originally Posted by drew231506

Saw this posted on this site. The second one is my tire!! So it says:

SHOCK SPRING TEAR
When the shock spring is too soft or too hard, the tire carcass is put under extreme duress to the point where the tire shreds and melts. This can be determined by measuring sag to see if the target number cannot be reached firstly, without considerably adding preload to the spring or secondly, if all the preload is off the spring.

Now what does that mean? haha.

It means.... see if you have the correct rate/strength spring to properly set sag.... if you are not able to properly set sag with the spring you have then all the rest of the adjustments count for nothing. Setting sag is the starting point. If your spring is wrong your tire becomes your suspension and the tire ends up looking like yours.

Trackdaze · 08-26-2008, 03:23 PM

Quote:

Originally Posted by drew231506

Hey guys, I read the thread in this section on sending the forks out and I may do that. Defan told me that the stock suspension isnt cutting it. The bike should hold its line in the turn but mine wants to run wide and I'm forcing it to hold. Which results in a front tire like this: (one day on the tire)

What do you guys think? Could it have been tire pressure instead? I don't know much about suspension and I've only ridden my stock bike so I wouldn't even know what to look for. Except I can't be buying a new tire every track day.

How difficult is it to remove your forks? I can take my wheels off now, which is pretty sweet.

Any idea on turnaround when you send them out? I guess I'll shoot them an email as well.

GUess the track from the tire and pic??

To me, that looks more like hot tear than spring tear. But I would still check sag front and back as well as have someone with knowledge like Dafan look at the suspension.

But I would bet that is hot tear MORE than spring tear.

Drew13 · 08-26-2008, 11:07 PM

Okay I had suspension set up by Rick at RNR Cycles, he was nearby and fit me in today. He said my suspension was set up to firm but the spring would be decent for my weight. He set the sag with 35mm front 36mm rear...seems like a lot to me if i remember correctly. Ill prolly redo it with a buddy to double check after doing some research. He also changed the fork oil. I went for a short ride tonight and i think i noticed a difference...it felt taller and a bit more nimble...but who the hell knows I may be making that up.

I'm a little nervous my suspension is going to be all jacked up now.

I'm going to try to flip that tire for this weekend to see what kind of wear I will get out of it. Should be interesting...

RCM78 · 08-27-2008, 07:39 AM

35mm up front is the norm. 36mm out back is more then usual. 25-30 is the norm.

Drew13 · 08-27-2008, 09:03 AM

Quote:

To me, that looks more like hot tear than spring tear. But I would still check sag front and back as well as have someone with knowledge like Dafan look at the suspension.

But I would bet that is hot tear MORE than spring tear.

Yea you could be right. I'll keep a better eye on tire pressure this time as well.

***Cakes206*** · 08-27-2008, 10:34 AM

What were your sag #'s to start off with before it got changed to 35mm-f and 36mm-r? Thats opposite of what you'd ultimately want to accomplish. They way they put it now the front end is sitting higher than the rear, which might feel "nimble" on the street(because the front is up higher changing CoG) but won't want to turn at higher speeds.

Drew13 · 08-28-2008, 10:33 AM

I'm going to redo the sag and double check what he did. It feels squishy, I think I'm going to set it between 25-30mm to start and do what you said Cakes.

SO has anyone flipped a front Supercorsa Pro?? I just had the one pictured flipped since I'll be at Shenny this weekend again. They also put these Dyna Beads into the tire to balance it?? I'll have to do some research...not real thrilled they did that.

Jake · 08-28-2008, 11:13 AM

I've ridden with a front SC pro flipped. No big deal.

lateapex · 08-28-2008, 12:19 PM

Quote:

Originally Posted by Jake

I've ridden with a front SC pro flipped. No big deal.

Do it all the time, no problem.

Trackdaze · 08-28-2008, 01:06 PM

You also have a rebound issue

You will notice the leading edge of the sipe is high while the trailing edge is chamfered also you see how the hot tear below each sipe is a bit cleaner. The tire is skipping over each sipe.

acronut · 08-28-2008, 01:45 PM

If you're to far to go see Ron at WCW at least give him a call. He can probably give you the best place to start. (908) 835-0043

Drew13 · 08-28-2008, 11:36 PM

Quote:

Originally Posted by acronut

If you're to far to go see Ron at WCW at least give him a call. He can probably give you the best place to start. (908) 835-0043

Ok I will if it continues.

The rider sag is set for 36mm Front/ 24mm Rear, that should be fine. I'm now leaning more towards the hot tear than the spring tear. I have tire warmers for this weekend and I'll be checking the pressure. I'll let you know the results...

Thanks for the help!