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Old 02-12-2010, 11:25 PM   #21
Tojo92
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Quote:
Originally Posted by Bagwell View Post
Hows that 450 Yamaha doin? We need to go ride some dirt. Let me know when you are ready.

Continue Threadjack...

Long story, but I am trading tomorrow for a street legal DRZ250 and an offroad only DRZ400 with extras. They fit my original intent a little better, and I will have a spare for friends. I had a CRF450R a while back and was lucky I didn't get hurt bad, the DR's will be better for me I hope. Ready to ride after this weekend.


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Old 02-13-2010, 12:19 AM   #22
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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.
That is why I went and bought 5mm longer bolts. BAM, full lock nut engagement.
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Old 02-13-2010, 03:55 AM   #23
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Jason,
Yes we can offset the wheel, and if you're intent on running the tire set up you have it's likely your best option.

A couple of comments, I'll speak generically here;
Offsetting the sprockets can be an option but there's some things to watch out for; on some models the countershaft nut may not engage the locking section anymore, the chain may rub on the inside of frame or on the chain block or the chain may drag on the chain guide / wear strip on the swing arm. None of which are good things.
As Hutch stated, make sure you use long enough rear sprocket bolts.
Also make sure that whatever you use to space the C/S with fits tightly on the shaft and does not rub the case machining a hole into it, also bad.


If the clearance issue is minimal you can run a non o-ring chain, or DID makes a narrow o-ring chain. Make sure you have more than just enough clearance. Wire wheels will flex a bit when loaded in corners.

Shaving the tire is also an option, just don't get carried away.

I would not recommend running the chain hitting the tire; it puts a drag on the engine and a load on the output shaft of the transmission, neither of which are good things either.

If possible the least expensive / best option is usually to simply go to a narrower tire, either a 150 or a brand that has a narrower overall width, but since you've got a 5" rim it limits your options.

My 2 cents, YMMV.
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Old 02-13-2010, 08:48 AM   #24
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Quote:
Originally Posted by SCRC John View Post
That is why I went and bought 5mm longer bolts. BAM, full lock nut engagement.
Ah yes, your Kung Fu is good.

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Old 02-13-2010, 08:51 AM   #25
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[QUOTE=Patrick;2428834]
If the clearance issue is minimal you can run a non o-ring chain, or DID makes a narrow o-ring chain.
[QUOTE]

I did not know this. Good info.

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Old 02-13-2010, 09:20 AM   #26
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Thanks again for all in the input, everyone. I've now got a few options to try.
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Old 02-14-2010, 11:40 AM   #27
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Jason, if you still have a problem or two (my WR rubs terribly on a 4.5 rim) there is some extensive info over on the "Super Motojunkie site. There are even some pictures as to how some of the racers/ riders have fixed this problem. You may choose to take a look over on that site as well.
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Old 03-23-2010, 09:00 PM   #28
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..
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Old 03-23-2010, 09:13 PM   #29
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Thats a great idea. Nice write up. What size rear wheel are you running?
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Old 03-23-2010, 09:30 PM   #30
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160 mich pilot on a 4.5"
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Old 03-23-2010, 09:45 PM   #31
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i have a drz chain guide sitting in my garage, but no tools to tap the swing arm. i saw a writeup like this before
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Old 03-23-2010, 10:14 PM   #32
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i also posted this on SMJ a long while ago.

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Old 03-23-2010, 11:26 PM   #33
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then you sir are the one who made me go out and order a drz chain guide
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Old 03-23-2010, 11:34 PM   #34
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did you email me a while back? with the WR?
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