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Widest rear tire that will fit on stock 03 crf450?

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Why widest? That's not always best. A 160 will fit on a 5" rim and a 150 is best on a 4.25-5. You want to match the tire to the rim that you have. Otherwise you'll throw off the handling and the life of the tire.

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what do you do with the bike? street riding? if so stick with either a 150 or maybe a 160 on a 4.25. The 150 should be fine with no rub assuming you have a chain guide. 160 will probably get some rub even with a guide.

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Different tires have different widths too. I went from 160/60/17 Pirreli slicks which didnt rub at all to 160/60/17 Qualifiers that rubbed on the chain and had less than 1/8" clearance on the swingarm; then back to 160/60/17 Power Pures that again fit with no rubbing. BTW highly recommend the pures for street. these were on my XR650R, im sure the swingarm is close to the same width.

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