bigger tires - 2003-04 Mach 1 Registry Owners Club

Rich · 02-25-2015, 03:09 PM

Whats the widest tire size we can put on the stock 17" rims. without messing up the spedo. I would like to fill out the rear wheel wells. I have a tunner so I can make tire size chenges.
Stock are 245/45r/17
Thanks for any info
Rich

DSG2003Mach1 · 02-25-2015, 03:19 PM

i dont think you can go too much wider without it just bulging, to really feel up the wheel wells you need to move to like 10.5" wheel imho. A change in width wont require changing anything in the tuner as long you as go with the right aspect ration for the sidewall.

Bmeagher · 02-25-2015, 09:23 PM

275/40r17 needs a 9" rim
315/35r17 needs a 10.5" rim.
Afs will sell just 2 17x9's

JDraper · 02-26-2015, 07:40 AM

I've been running 275/40's on my stock rears for years without issues. Here's a pix of how they look on the rims.

Rich · 02-26-2015, 10:47 AM

thanks for information. I like the look of the 275 40 17

02-25-2015, 03:09 PM	#1
Rich Registered User Join Date: Aug 2014 Location: Belleville, MI. Posts: 46	bigger tires Whats the widest tire size we can put on the stock 17" rims. without messing up the spedo. I would like to fill out the rear wheel wells. I have a tunner so I can make tire size chenges. Stock are 245/45r/17 Thanks for any info Rich

02-25-2015, 03:19 PM	#2
DSG2003Mach1 700 HP Mach Join Date: Nov 2003 Location: Orlando, FL Posts: 8,384	Re: bigger tires i dont think you can go too much wider without it just bulging, to really feel up the wheel wells you need to move to like 10.5" wheel imho. A change in width wont require changing anything in the tuner as long you as go with the right aspect ration for the sidewall. __________________ 03 dsg mach1 - MPR built 9.5:1 motor, D1, cams, ported intake, full exhaust, magnum t56, built rear, E85 etc... '12 F150 FX2 Supercrew with Ecoboost daily beater

02-25-2015, 09:23 PM	#3
Bmeagher Registered User Join Date: Feb 2008 Location: Cowtown, Alberta Posts: 1,261	Re: bigger tires 275/40r17 needs a 9" rim 315/35r17 needs a 10.5" rim. Afs will sell just 2 17x9's __________________ Maximum Motorsports race series shocks/struts, coilovers front and rear, K member, bump steer kit, solid steering shaft, Panhard bar. Built Rear End with 4.30's, Hooker longtubes, Comp 106100's, Fidanza Aluminum Flywheel, Centerforce DF, *FR500 intaked 1/2" Spacer, Livernois Springs, Ford GT Followers in the works.* *SAE 378RWHP ,302 ft/lbs* 70-120mph run http://www.youtube.com/watch?v=1hqjiOeYWAE

02-26-2015, 07:40 AM	#4
JDraper On Permanant Vacation Join Date: Feb 2004 Location: McVeytown, PA Posts: 5,015	Re: bigger tires I've been running 275/40's on my stock rears for years without issues. Here's a pix of how they look on the rims. __________________ And then one day you find, 10 years have got behind you, no one told you when to run, you missed the starting gun.. 18 Shelby GT 350 04 Mach 1 (Sold 9/1/2018 ) 18 Ford Explorer XLT 17 Mustang GT/CS Convertible 16 Fusion SE AWD Ecoboost 10 Fusion SE V6 66 289 Mustang Hardtop Restomod

02-26-2015, 10:47 AM	#5
Rich Registered User Join Date: Aug 2014 Location: Belleville, MI. Posts: 46	Re: bigger tires thanks for information. I like the look of the 275 40 17

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