98 WR400 Tire ?????

I just bought a 98 wr400. And I am going to get it street legal. I'll be riding it to school and work in Rexburg, ID. I am looking at the Maxxis M6006. Read some great reviews on the tire. I am wondering can I run a 140/80-18 on the rear? It has a 120/90-18 on it right now. Is that two wide for a stock swing arm? Will my chain eat the side of it?:thumbsup:

Oh and since I have the tires off should I put in new tubes?

Thanks

I just bought a 98 wr400. And I am going to get it street legal. I'll be riding it to school and work in Rexburg, ID. I am looking at the Maxxis M6006. Read some great reviews on the tire. I am wondering can I run a 140/80-18 on the rear? It has a 120/90-18 on it right now. Is that two wide for a stock swing arm? Will my chain eat the side of it?:thumbsup:

Dont you think the chain will touch the tire with 140:s?

Thats what i was wondering. I think I am going to go with the 120 just to be safe. The only size this website offered was a 120 or a 140

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