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Old 02-12-2010, 05:41 PM   #1
Jason_Canuck
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Chain Rub

Just mounted up my rear on my KTM SMR, and the chain rivets (o-ring chain)are rubbing tire ever so slightly. So your thoughts,

1. Ride the way it is and let chain cut down tire
2. Shave tire
3. Offset rim
4. Drop down to 150 rear


Wheel is pretty much centered perfectly as I measured from swingarm pivot point to center of axle and didn't use the notches in swingarm, so I feel its centered.
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Old 02-12-2010, 05:43 PM   #2
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I'm no expert but I wouldn't go with 1, or 2.
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Old 02-12-2010, 05:44 PM   #3
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I used ever so slightly longer sprocket bolts and shimmed my sprocket out with some washers. It was enough to clear the 160 on my bike. I rode it all day at GSS and no chain rub. With that said I rode it before with some chain rub, it didn't really effect the bike any, but I was trying to fix it to see if I could. I really prefer the 160 rear on a 5" rim.
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Old 02-12-2010, 05:58 PM   #4
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Quote:
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I used ever so slightly longer sprocket bolts and shimmed my sprocket out with some washers. It was enough to clear the 160 on my bike. I rode it all day at GSS and no chain rub. With that said I rode it before with some chain rub, it didn't really effect the bike any, but I was trying to fix it to see if I could. I really prefer the 160 rear on a 5" rim.
I really don't wanna drop tire size. I'm gonna take her for a spin around the block tomorrow and see what it feels like. I should have added washers to the list cause that is another option.
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Old 02-12-2010, 06:07 PM   #5
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Buy a non O ring chain, problem solved.

I have the same problem with my o ring chain, but no issues with my non o ring chain.

Best bet if you dont want to replace the chain is to do like John said, and use a spacer between the rear sprocket and hub. You will also need to space the front sprocket, so the chain isnt out of alignment. Not sure if the KTM's have a chain guide on the bottom side of the swinger. If they do you will need to remove it. That was the problem with running the spacer on my bike.

Non O ring chain is the way to go though!
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Old 02-12-2010, 06:09 PM   #6
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Quote:
Originally Posted by Jason_Canuck View Post
Just mounted up my rear on my KTM SMR, and the chain rivets (o-ring chain)are rubbing tire ever so slightly. So your thoughts,

1. Ride the way it is and let chain cut down tire
2. Shave tire
3. Offset rim
4. Drop down to 150 rear


Wheel is pretty much centered perfectly as I measured from swingarm pivot point to center of axle and didn't use the notches in swingarm, so I feel its centered.
3. Offset rim or
4. Drop down to 150 rear
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Old 02-12-2010, 06:10 PM   #7
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Any idea what the width difference is? I'm short about 1mm with chain under load.
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Old 02-12-2010, 07:22 PM   #8
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Quote:
Originally Posted by Jason_Canuck View Post
Any idea what the width difference is? I'm short about 1mm with chain under load.
Difference in tire width or chain width?

I am not sure the actual measurements, but an O ring chain made slap marks on my rim, and the non O ring chain doesn't rub the tire.
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Old 02-12-2010, 07:57 PM   #9
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Any particular brand off non O-ring chain better than others?
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Old 02-12-2010, 08:14 PM   #10
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Try option 1 or 2. Make sure you tell everyone you love them.
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Old 02-12-2010, 08:23 PM   #11
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I have always ran a non-Oring chain, I just put a new one on there, I believe it is a RK
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Old 02-12-2010, 08:25 PM   #12
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This is the one I have.

http://www.rkexcelamerica.com/rk_chain_520mxz4.html
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Old 02-12-2010, 09:40 PM   #13
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I am no expert, but I would do the 150 rear tire size. It will have pleanty of rear contact patch im sure. What size is your SMR? Is that the 620 or more motor? Most motards have 4.5 rear rims dont they? What size rear rim is on the bike?
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Old 02-12-2010, 11:04 PM   #14
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5 inch rear, that's why I'm shying away from 150

Gonna try the chain, and if I don't get the clearance I need, offset rim.

Patrick, can you guys offset rim?
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Old 02-12-2010, 11:05 PM   #15
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Wow, thats a wide rear rim. That is designed for a 170 tire.
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Old 02-12-2010, 11:15 PM   #16
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I've got a 2006 KTM SMR450. I run a 150 with Conti's and no problem with clearance at all and I bet a 160 Conti would fit no problem. I did add BT003RS, same size (150), and they rub due to a different profile. The tires were great though.

I would caution spacing. When I had my 150 BT003RS's installed, the shop spaced the sprocket out a bit with washers. I ran a full LSTD track session at Cresson, then another. The last one in, I noticed some bolts on the ground and thought "Some poor is gonna get hurt out there." The I couldn't push the bike backwards. Any guesses why? The spacer was just enough to keep the bolt from locking down and they had backed out.

End result is I missed a bunch of sessions, replaced the bolts without the washers, and althought the tire rubbed it was all good. A non-O ring chain is fine, but you do run the risk of some serious chain slap on the rim as it gets worn out. See pics of my extra set for sale right now.

A lot of people think shaving the side wall down or allowing it run ends in disaster.

Example: "Try option 1 or 2. Make sure you tell everyone you love them."


It doesn't. I still recall seeing Ronnie Haye's CRF450 motard that looked like a bunch of rubber had been shaved off. He did just fine on it.

Run a 150 if you can, but even then, the profile might be different enough to cause a rub. I can tell you that if my extra wheel set doesn't sell, I will run them with no worries. Of course, I do crash on occassion.
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Old 02-12-2010, 11:16 PM   #17
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Quote:
Originally Posted by Jason_Canuck View Post
5 inch rear, that's why I'm shying away from 150

Gonna try the chain, and if I don't get the clearance I need, offset rim.

Patrick, can you guys offset rim?
Sorry, didn't see this. Maybe a different brand tire in 160?
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Old 02-12-2010, 11:20 PM   #18
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Hows that 450 Yamaha doin? We need to go ride some dirt. Let me know when you are ready.

Quote:
Originally Posted by Tojo92 View Post
I've got a 2006 KTM SMR450. I run a 150 with Conti's and no problem with clearance at all and I bet a 160 Conti would fit no problem. I did add BT003RS, same size (150), and they rub due to a different profile. The tires were great though.

I would caution spacing. When I had my 150 BT003RS's installed, the shop spaced the sprocket out a bit with washers. I ran a full LSTD track session at Cresson, then another. The last one in, I noticed some bolts on the ground and thought "Some poor is gonna get hurt out there." The I couldn't push the bike backwards. Any guesses why? The spacer was just enough to keep the bolt from locking down and they had backed out.

End result is I missed a bunch of sessions, replaced the bolts without the washers, and althought the tire rubbed it was all good. A non-O ring chain is fine, but you do run the risk of some serious chain slap on the rim as it gets worn out. See pics of my extra set for sale right now.

A lot of people think shaving the side wall down or allowing it run ends in disaster.

Example: "Try option 1 or 2. Make sure you tell everyone you love them."


It doesn't. I still recall seeing Ronnie Haye's CRF450 motard that looked like a bunch of rubber had been shaved off. He did just fine on it.

Run a 150 if you can, but even then, the profile might be different enough to cause a rub. I can tell you that if my extra wheel set doesn't sell, I will run them with no worries. Of course, I do crash on occassion.
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Old 02-12-2010, 11:24 PM   #19
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Shaving tire appears to be a common option, when researching on SMJ. if GSS builds the dirt section, gonna have to lose the O-Ring anyways, so I figure I'll try that first and it doesn't require me driving from the coast to north houston to have rim offset.
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Old 02-12-2010, 11:25 PM   #20
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As other have stated, options 1 & 2 are not the safest choice.
Double check your swing arm clearance for option 3.
I went with option 4 myself, still some rub but every so slightly.
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