SuzukiSavage.com - Rear tire Scuff

Arizuno

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Rear tire Scuff
02/27/12 at 14:12:11

PO semi-permanently installed saddlebags over OEM 'bag guards. Removal of the 'bags reveals a problem they'd obscured: the tire is evidently rubbing against the guard mount bolts, enough to have shaved a few hundredths off the ridge where tread meets sidewall. (FWIW, that tire is a Dunlop (D404) 140/90 70H, also put there by the PO at less than 1300 miles (?)).

I tried searching the forum for similar reports, haven't found anything. So - why would this contact be occuring? There isn't much space in that neighborhood, of course, but evidently others using these guards haven't had any problem. Were longer, non stock bolts used to accomodate the guards? Is something else amiss?

Thanks, and if I can be more vague, just let me know...

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MotoBuddha Serious Thumper Offline Let's roll! Posts: 1416 Charlotte, NC	Re: Rear tire Scuff Reply #1 - 02/27/12 at 14:19:48 Isn't the stock size tire narrower?
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arteacher Serious Thumper Offline Ride as if your naked and invisable! Posts: 2581 London ontario Gender:	Re: Rear tire Scuff Reply #2 - 02/27/12 at 14:25:29 1/4" longer bolts are used to accommodate the guards. Stock tire size for the rear is 140/80-15, so there's your problem. Round head bolts might solve the problem, or you could counter sink the guards to accommodate flat head bolts, if you want to keep the oversized tire.
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Arizuno Full Member Offline SuzukiSavage.com Rocks! Posts: 227 Prescott, AZ Gender:	Re: Rear tire Scuff Reply #3 - 02/27/12 at 15:30:06 darn it! MotoBudda and arteacher are both right. I just (re)checked the owner's manual, which I was evidently incapable of reading correctly yesterday, and, indeed, the stocker is 140/80. Those 10mm are important! I'll start working on Plan B. But that brings up a point: What effect, if any, would the wider tire have on handling?
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justin_o_guy2 Serious Thumper Offline What happened? Posts: 55279 East Texas, 1/2 dallas/la.	Re: Rear tire Scuff Reply #4 - 02/27/12 at 17:57:25 Right up till the bolt heads eat thru, not much..
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Savage_Rob Serious Thumper Alliance Member Offline Mechanically Inclined Amateur Posts: 6972 Texas (Dallas area) Gender:	Re: Rear tire Scuff Reply #5 - 02/27/12 at 20:36:44 Do two things. First, replace the mounting bolts with stainless mushroom head allen bolts. Next, raise your shock presets. That's all you really need to do. My Dunlop 491 is the same size. I did the same. Later I put 12.5” Progressive shocks on and it has all kinds of clearance now.
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MotoBuddha Serious Thumper Offline Let's roll! Posts: 1416 Charlotte, NC	Re: Rear tire Scuff Reply #6 - 02/29/12 at 11:15:02 Savage_Rob wrote on 02/27/12 at 20:36:44: Do two things. First, replace the mounting bolts with stainless mushroom head allen bolts. Or get out the grinder and shorten the bolts he has.
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Boofer

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Re: Rear tire Scuff
Reply #7 - 03/01/12 at 19:31:56

Arizuno wrote on 02/27/12 at 15:30:06:

darn it! MotoBudda and arteacher are both right. I just (re)checked the owner's manual, which I was evidently incapable of reading correctly yesterday, and, indeed, the stocker is 140/80. Those 10mm are important! I'll start working on Plan B.

But that brings up a point: What effect, if any, would the wider tire have on handling?

Actually the 10mm difference is in the aspect ratio, which means that the sidewall height is 90% of the tread width. Many on here run 140mm (section width) 90 (aspect ratio) 15 (rim size) tires with no problems or alterations. The most reported problem is rubbing the bolt heads holding the sissy bar brackets. Serowbot also says running the taller tire helps correct an optomistic speedometer. Check to see that your belt guard is on straight and your tire is lined up right. Something is definitely wrong, but I doubt tire size is the problem.

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Savage_Rob

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Re: Rear tire Scuff
Reply #8 - 03/02/12 at 08:52:30

It is the size. The stock tire barely cleared with the saddlebag supports installed. The Dunlop 404 or 491 will rub slightly on the left side. If the saddlebag supports are removed, it will not rub. Otherwise, switching the bolts to mushroom-head allen bolts (I prefer stainless) allows it to barely clear but raising the shock preset helps a bit more. You could take MotoBuddha's suggestion and grind down the heads of the bolts but I already hate getting a wrench on these while the tire is on. The thinner grip surface would just piss me off. I went with the mushroom-head allens and they're fairly easy to access.

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