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Sooooooooo.....building my wife a supermoto.

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So I'm building my wife a supermoto. We are primarily dirt riders. But last year I picked up a KLX450R for dirt riding that came with some warp 9s and ContiAttacks. Well after tearing up the city hauling between breweries last summer I am hooked. I love tearing up the town on my dirt bike with street bike grip.

But enough about that. My wife's got a CRF250X for dirt riding that is street legal and she was really jealous of my set up. So for her birthday a couple months ago I got her some wheels. Just hubs and rims at the time since it was still winter. They are just the no name fleabay ones, I know I know, but she is new to dirt and even newer to street riding. Just got her license last summer. She definitely won't be on the track, and is still very timid on the street so no high speed or hard turns. Just wants to follow me on the urban assault around town. Its time to finish the wheels now though. I'm looking at getting some Shinko 006 Podiums for them cause they seemed to be liked by the less serious riders and I can get the set for under $200. Unless people start to say they are terrible.

I'm really not sure on tire size though since I'm new to SM. I have a 150/60 on my rear and a 120/70 on the front but don't know my rim widths. I was afraid of fitment on the small bike so I went with a 4.25 rear rim and 3.5 front. Are the tire sizes on my bike good for these rims? Anyone with this bike and know about fitment? I can also get a 120/60 for the front and don't know if 60 or 70 would be better. I can also get a 110/70 for the front and a 140/60 for the rear. Would the narrower tires be better for the smaller 250? Will occasionally be running 50-60mph for short stints. Also for the sprocket, I can get a 48t and the next option down is a 42t I think. Haven't found any in between yet. I think 48t is low enough though cause it'll do 55mph with her on it now with a 53t and dirt tires, but wanted to get some opinions on that too.

Thanks for the help.

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150 rear and 120 front are the proper sizes for the 4.25 and 3.5 rims.  I would stick with those.  Some DOT tires can be really wide so you will have to watch for clearance issues or offset the rear.  Remember gearing will be effectively lower with the 17" wheels.  You want to gear pretty tall so it is not screaming to cruise at 50 or 60.

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OK so I should prolly go with the 42t? Unless someone knows where to get something between 42t and 48t . Also any good place for tubes? I'm having trouble finding a front. I may have to buy a 4-4.5in. 

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call sprocket specialists.  anything you want that can fit the flange.  I have bought my wife lots of bikes over the years.  Best part is she doesn't ride.  (She has lots of guns too!)

Edited by ossagp

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On 4/19/2017 at 11:31 AM, ossagp said:

call sprocket specialists.  anything you want that can fit the flange.  I have bought my wife lots of bikes over the years.  Best part is she doesn't ride.  (She has lots of guns too!)

Wish I could pull that off. Lol. I found a 44t finally. I think that's gonna be perfect. Still having trouble finding a tube for the front wheel. 

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