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my buddy has a 300sx its nice!he blew out a tire and doesn't have alot of moneyheres the big ? for yallhe has 255/40/18 tires on the front. the rim is a 18x8.5 can we put a 245/40/18 on that rim??? if it will work he can save like $60 a tirei know someone knows this stuff i need to know asaphit me up on here or email me Raivisdaddy2@aol.comthanks guys

The 255's are 9.9 inches across and the 245's are 9.5 inches across so they should work. I hope he is replacing them in pairs.

he will be thats one yes i need a few more so he will feel comfortablewhere did you get ur info at???

Calculator255 mm / 25.6 = 9.9 inches rounded off245 mm / 25.6 = 9.5 inches rounded offThe actual width of the tires is usually close to those number especially when you get down to 40 series tires.

The 245/40/18's are recommended for the 8.5 rim.So,he should be fine.

So long as he replaces it in pairs, he should be fine. I might notice some rubbing on the wheel wells as he approaches the bump stops, but he should be fine.

Quote, originally posted by chevelle_lover »Calculator255 mm / 25.6 = 9.9 inches rounded off245 mm / 25.6 = 9.5 inches rounded offThe actual width of the tires is usually close to those number especially when you get down to 40 series tires.I believe you divide by 25.4.

DjbWhy do I think that you are right. I have really gotten math lazy since I bought a scientific calculator a few years ago. Please forgive the conversion error. Damn college chemistry.

Quote, originally posted by engineertwin2 »He might notice some rubbing on the wheel wells as he approaches the bump stops, but he should be fine.The new tires would be a tad smaller than the old ones. No trouble with clearance, methinks.