Tire size help? - 2003-04 Mach 1 Registry Owners Club

04shkr · 12-31-2008, 05:22 PM

Looking to by some new tires for the rear and wondering what you folks recommend! The rear wheels are 18x10 and it has Pro Kit springs. right now it has 275/ 35/18 on it and i have about 2 1/2" from top of tire to fender. wanting to fill in gap some but not rub and would also like some more width without rubbing pipes. going to try to order this weekend so any help would be great.

wiz_of_wuz · 12-31-2008, 05:35 PM

Just from a cost perspective for 18's I would jump to the 295's and call it good!

04shkr · 12-31-2008, 05:38 PM

Quote:

Originally Posted by wiz_of_wuz

Just from a cost perspective for 18's I would jump to the 295's and call it good!

Thanks for the response! Are the 305s alot higher?

wiz_of_wuz · 12-31-2008, 05:46 PM

I dont know that they are alot higher but you cant find that size in 18 in many choices. Go to tirerack.com and get a idea of sizes and prices.

PCPRO · 12-31-2008, 06:36 PM

A 305/35/18 will be approximately .820" taller in diameter, and 1.18" wider. Numers are approximate due to variations from manufacturer to manufacturer. This size would be a much better fit for the 10" rims that you are running. I used to work at a tire/wheel shop.

04shkr · 12-31-2008, 06:56 PM

Quote:

Originally Posted by PCPRO

A 305/35/18 will be approximately .820" taller in diameter, and 1.18" wider. Numers are approximate due to variations from manufacturer to manufacturer. This size would be a much better fit for the 10" rims that you are running. I used to work at a tire/wheel shop.

saw some pics of 315/35s that looked real nice on the cars but they were all on 17" wheels! So would the 315s be too large for the 18s?

frisko4one5 · 12-31-2008, 07:17 PM

I'm running 295/35/18s on my Bbs rks 18x10 rims and I think they are perfect. 315s are nice I had them on 17s before but they are also about 40 bucks more. I think 295s are perfect 315s if u can afford it and want your rears alot wider

04shkr · 12-31-2008, 07:25 PM

Quote:

Originally Posted by frisko4one5

I'm running 295/35/18s on my Bbs rks 18x10 rims and I think they are perfect. 315s are nice I had them on 17s before but they are also about 40 bucks more. I think 295s are perfect 315s if u can afford it and want your rears alot wider

Do you have any pics? What brand tire are you running? I was just on Nittos site and they arent showing 295/35 18 in the 555s only in the Invos. They are only showing 285/40 18s in the 555s

PCPRO · 12-31-2008, 07:34 PM

A 275/35/18 is app. 25.58" in diameter and 10.82" wide.
A 305/35/18 is app. 26.40" in diameter and 12.01" wide.
A 315/35/18 is app. 26.68" in diameter and 12.40" wide.

A 305/35/18 is perfect for a 10" rim. You can run a 315/35/18 but I wouldn't go any bigger.

Hope this helps.

GOTdaBLUE1 · 12-31-2008, 08:21 PM

The optimum tire size for an 18X10 rim is 285/35/18. Only a +0.66 diameter difference from OEM, and fits a 10" rim perfectly. FYI, all the suggested tire sizes (mine included) will not fill any of the gap in question. Theoretically, one wants to provide an aftermarket tire size as close to OEM diameter as possible. H&R Super Sport springs should remedy your gap issue.

12-31-2008, 05:22 PM	#1
04shkr 04SHKR Join Date: Nov 2008 Location: Rutledge, TN Posts: 146	Tire size help? Looking to by some new tires for the rear and wondering what you folks recommend! The rear wheels are 18x10 and it has Pro Kit springs. right now it has 275/ 35/18 on it and i have about 2 1/2" from top of tire to fender. wanting to fill in gap some but not rub and would also like some more width without rubbing pipes. going to try to order this weekend so any help would be great. __________________ In the shop for pro charger install...STEEDA RAI; Polished C&L Inlet Pipe; BBK OffRoad X Pipe; Super 40 Series Flowmasters; 3 1/2" black chrome tips; Eibach Pro Kit; FRPP 4.10 Gear; SCT Performance Tune By Noe's Performance; Optima Red Top; FR500 Black Chrome Wheels 18x9 w/ 245/40/18 ; 18x10 w/295/35/18 Goodyear F1 D3's; STEEDA Wing; UPR Fuel Door; Top & Trunk Striping; Flamed Pony Grill Emblem; CO MRT Shift Knob; Embroidered Headrests; TBS 8" Sub; Concept Amp; Mach 1 Floor Mats;

12-31-2008, 05:35 PM	#2
wiz_of_wuz chillin' by the Lake Join Date: Dec 2007 Location: Holland,MI Posts: 502	Re: Tire size help? Just from a cost perspective for 18's I would jump to the 295's and call it good! __________________ "Hell Yes your Fast! You were hauling a$$ when i passed you!" B-Day 4/13/04 MRT H Mid with Cats Magnaflow Cat back Steeda Triax Shifter FRPP Aluminum Driveshaft FRPP 4:10 Rears http://i12.photobucket.com/albums/a2...z/DSC05124.jpg

12-31-2008, 05:46 PM	#4
wiz_of_wuz chillin' by the Lake Join Date: Dec 2007 Location: Holland,MI Posts: 502	Re: Tire size help? I dont know that they are alot higher but you cant find that size in 18 in many choices. Go to tirerack.com and get a idea of sizes and prices. __________________ "Hell Yes your Fast! You were hauling a$$ when i passed you!" B-Day 4/13/04 MRT H Mid with Cats Magnaflow Cat back Steeda Triax Shifter FRPP Aluminum Driveshaft FRPP 4:10 Rears http://i12.photobucket.com/albums/a2...z/DSC05124.jpg

12-31-2008, 06:36 PM	#5
PCPRO Big Daddy Join Date: Sep 2007 Location: Lawrenceburg, Ky. Posts: 322	Re: Tire size help? A 305/35/18 will be approximately .820" taller in diameter, and 1.18" wider. Numers are approximate due to variations from manufacturer to manufacturer. This size would be a much better fit for the 10" rims that you are running. I used to work at a tire/wheel shop. __________________ Custom cams spec'd by nasvt,Accufab t-body, ported short runner by nasvt,Roy's 3/4" intake spacer,JLT RAI,AFM 10" filter,PMAS 95mm Velocity Maf,Stewart water pump,Even-flow cooling mod,Steeda UD damper,Steeda wp pulley,Cobra R alt. & p/s pulleys,ARH 1.750" Lt's & off road X-pipe,Magnaflow catback,Fidanza aluminum flywheel,fidanza 2.1 clutch and lightweight billet pressure plate, FRPP aluminum d/s. 345rwhp & 340rwtq with 98 cobra cams.....numbers with new cams coming soon!

12-31-2008, 07:17 PM	#7
frisko4one5 2K3MACH Join Date: Nov 2007 Location: San francisco california Posts: 1,707	Re: Tire size help? I'm running 295/35/18s on my Bbs rks 18x10 rims and I think they are perfect. 315s are nice I had them on 17s before but they are also about 40 bucks more. I think 295s are perfect 315s if u can afford it and want your rears alot wider __________________ 03 Torch Red Auto IUP 1 of 528 MODS: PERFORMANCE: Pypes M80 muffler exhaust ,Roush Subframe Connectors, Stock h-pipe(for now), Eibach Prokit, Bilstien shocks/struts APPERANCE: Mach 1 ID PLATE,"Ram Air" Shaker Emblems, Tinted Tail Lights,18x9/10 Matt Black FR500's, UPR auto shift ball w/ OD, Stock look for now

12-31-2008, 07:34 PM	#9
PCPRO Big Daddy Join Date: Sep 2007 Location: Lawrenceburg, Ky. Posts: 322	Re: Tire size help? A 275/35/18 is app. 25.58" in diameter and 10.82" wide. A 305/35/18 is app. 26.40" in diameter and 12.01" wide. A 315/35/18 is app. 26.68" in diameter and 12.40" wide. A 305/35/18 is perfect for a 10" rim. You can run a 315/35/18 but I wouldn't go any bigger. Hope this helps. __________________ Custom cams spec'd by nasvt,Accufab t-body, ported short runner by nasvt,Roy's 3/4" intake spacer,JLT RAI,AFM 10" filter,PMAS 95mm Velocity Maf,Stewart water pump,Even-flow cooling mod,Steeda UD damper,Steeda wp pulley,Cobra R alt. & p/s pulleys,ARH 1.750" Lt's & off road X-pipe,Magnaflow catback,Fidanza aluminum flywheel,fidanza 2.1 clutch and lightweight billet pressure plate, FRPP aluminum d/s. 345rwhp & 340rwtq with 98 cobra cams.....numbers with new cams coming soon!

12-31-2008, 08:21 PM	#10
GOTdaBLUE1 "Can you hear me now?!?" Join Date: Aug 2003 Location: San Rafael, CA Posts: 1,048	Re: Tire size help? The optimum tire size for an 18X10 rim is 285/35/18. Only a +0.66 diameter difference from OEM, and fits a 10" rim perfectly. FYI, all the suggested tire sizes (mine included) will not fill any of the gap in question. Theoretically, one wants to provide an aftermarket tire size as close to OEM diameter as possible. H&R Super Sport springs should remedy your gap issue. __________________ 2003 Azure Blue 5-speed IUP born 01/24/03 378277 SOLD* ________________________________ 1997 Lincoln Towncar Signature Series Light Cypress Metallic Clearcoat SOLD ________________________________ Current stable includes: Silver W210 E55 AMG; Black 996 Carrera w/GT3 aero kit

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