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Discussion Starter #1
So I recently bought some warp 9 wheels for my crf250x. I am new to this and now need help figuring out what tire size. I'm most likely going with Michelin pilot powers or powers2ct. I was planning on a 120/70/17 in front and a 150/70/17 in back. I know some people run 160/70/17 in back but I want to minimize chain rubbing. Does this setup sound good? What are some other recommendations. This is for 95% street riding. Thanks!
 

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With my old dunlop I had chain rub with the 160, but I'm running 160 avon's now and I have about a 1 1/2 cm of clearance
 

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Discussion Starter #3
so do you think it would be a safe bet to just run a 150? Is there a way that i can measure before i buy the tires if i will get chain rub or not? Thanks for your reply.
 

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Thank you very much! I am pretty set on a 150/60/17 Pilot Power on the rear but I am still undecided on the front size 120/60/17, 120/65/17, or 120/70/17? Any advice on the fronts would be great!
 

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The 150 looks good, on the front I have a 120/70/17 and I like it a lot I had to cut down the fork guards but it shouldn't be a problem :thumbup:
 

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I have a crf 250 converted to sm and im running a 150 on a 4.25 rim, i get chain rub and its pretty close to my tyre.

I can post some pictures of how close it runs to the chain if you want?

Jake
 

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Discussion Starter #8
I have a crf 250 converted to sm and im running a 150 on a 4.25 rim, i get chain rub and its pretty close to my tyre.

I can post some pictures of how close it runs to the chain if you want?

Jake
some pictures would be good if you could. Thanks
 

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some pictures would be good if you could. Thanks
This is with a 150/60 bridgestone battlax,



Sorry pictures didn't turn out as well as i though, let me know if you need any more.
Jake
 

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sorry didnt see you asked about the front tyre size, im running a 120 60 17 bridgestone, just have to trim the fork guards a little.
 

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Heres my crf250r with a 150 shinko mounted on a 5" rear rim. Ive got a 120 on the front. The actual width of the 150 tires will vary among manufacturers. You should be alright with a 150 but to be safe you may want to make up a chain slider to keep the chain from slapping your tire.

 

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O, and my front is a 120/70-17, thats what most supermoto guys run on the front. The 60 will turn quicker but the 70 will get more grip in the corners. Since your bike is a very light 250, I would suggest the 70. Another good mod for your bike is to swap out the long bolts from your lower chain guide (the one near your sprocket), with countersunk bolts. You put the countersunk bolts on from the inside and put the nuts on the outside. This will make installing and removing the rear rim much easier.
 

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Discussion Starter #13
Heres my crf250r with a 150 shinko mounted on a 5" rear rim. Ive got a 120 on the front. The actual width of the 150 tires will vary among manufacturers. You should be alright with a 150 but to be safe you may want to make up a chain slider to keep the chain from slapping your tire.

Do you happen to have a picture or suggestions on how to make a chain slider and where it goes? Thanks for your help.
 

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Do you happen to have a picture or suggestions on how to make a chain slider and where it goes? Thanks for your help.
It is the black block in the top middle of the above picture. Heres a link to a picture of what I tried to make mine look like. Epic Chain Slider I bought a delrin block on ebay and cut it to fit onto a bracket that I made out of aluminum sheetmetal.
 
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