how big of a tire can i fit - Page 3 - Ford Truck Enthusiasts Forums

Go Back  Ford Truck Enthusiasts Forums > Diesel > 6.4L Power Stroke Diesel
Reload this Page >

how big of a tire can i fit

Notices
6.4L Power Stroke Diesel Engine fitted to 2008 - 2010 F250, F350 and F450 pickup trucks and F350 + Cab Chassis

how big of a tire can i fit

Reply

 
 
 
  #31  
Old 06-02-2011, 02:35 PM
bhalulko
bhalulko is offline
New User
Join Date: Sep 2009
Location: Pittsburgh, PA
Posts: 15
bhalulko is starting off with a positive reputation.
I have a 2008 F-250 6.4L. Came with 265-70-17". I am looking to do the 2.5" lift in the front (with new shocks) and a 2" block in the back.

I need to step up my tire size- I'm looking at 315x70x17" tires on new 17x8.5 rims. Does anyone know if these will fit with the lift kit? How about without the lift kit?
 
Reply With Quote
  #32  
Old 06-05-2011, 09:25 AM
Ronin 5729's Avatar
Ronin 5729
Ronin 5729 is offline
Senior User
Join Date: Mar 2006
Posts: 437
Ronin 5729 is gaining momentum as a positive member of FTE.
Ugghhh...I'm gonna sound like a broken record on this particular topic, kind of the way I do when it comes to tuning. Anyway, here goes...

Do NOT put 12.5 tires on a stock (8 inch wide) wheel. They are NOT the proper size, period. It doesn't matter how many people do it, that doesn't mean they're the right fit...sorry.

Just about every tire manufacturer has a "recommended rim/wheel width" specification on their website, and I couldn't fit a single one that recommended a 12.5 inch tire, never mind a 13.5 inch tire (?!?!?!) for an 8 inch rim.

Why does it matter? You may get it to fit (as obviously a whole lot of people here have) and it may look right, but you don't need to be a tire engineer to figure out you're putting a whole lot of sidewall stress on the tire by fitting it on a wheel that's too narrow. And if you tow (as I do with my '10 F250) you could be asking for all sorts of trouble.

That's definitely trouble I don't need, and although it seems a whole lot of tire shops don't seem to mind that they're fitting the wrong size tire on a rim they sure would care if there was a catastrophic malfunction/failure followed by a wreck...or worse...

That's when the "I read it was OK to do it on the internet" excuse would fall real short in a court, etc.

What will work? For stock 18s the Toyo Open Country A/T 285/75 R18 which, coincidentally, are double marked as 35x11.5 R18. The Open Country M/Ts are also available in the same size, and both tires are Load Range E rated, as they should be. I would not recommend a Load Range D tire on these trucks. That's a step down from stock and will give you all sorts of squirm with load. Not cool.

If you want a legit, unbiased, thoroughly researched and "court defensible" (!) answer to your question, call Tire Rack tech support @ 888-541-1777. They'll tell you exactly what you can (or can't use)...

Hope this helps...
 
Reply With Quote
  #33  
Old 02-20-2014, 08:11 AM
Grizzly4x4's Avatar
Grizzly4x4
Grizzly4x4 is offline
Senior User
Join Date: Dec 2013
Location: Conyers, Ga
Posts: 263
Grizzly4x4 is starting off with a positive reputation.
Does anyone know if you need a lift to clear 35" on an 04? I'm not sure if the wheel wells are the same size. It seems like I need a 4", does that sound right? I'm thinking of getting Toyo Open country m/ts 35/12.5/17. How much back spacing would I need with a 17x8.5?
 
Reply With Quote
  #34  
Old 02-27-2014, 01:55 PM
RM2738's Avatar
RM2738
RM2738 is offline
Posting Guru
Join Date: Sep 2010
Location: The Woodlands, TX
Posts: 2,200
RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.RM2738 has a very good reputation on FTE.
I'm running 37x13.50R22 with a 2-1/2" kit in front, 350 blocks in the rear. Occasional rub.
 
Reply With Quote
  #35  
Old 02-28-2014, 03:13 PM
finaddict's Avatar
finaddict
finaddict is offline
Freshman User
Join Date: Apr 2009
Posts: 37
finaddict is starting off with a positive reputation.
Originally Posted by Ronin 5729 View Post
Ugghhh...I'm gonna sound like a broken record on this particular topic, kind of the way I do when it comes to tuning. Anyway, here goes...

Do NOT put 12.5 tires on a stock (8 inch wide) wheel. They are NOT the proper size, period. It doesn't matter how many people do it, that doesn't mean they're the right fit...sorry.

Just about every tire manufacturer has a "recommended rim/wheel width" specification on their website, and I couldn't fit a single one that recommended a 12.5 inch tire, never mind a 13.5 inch tire (?!?!?!) for an 8 inch rim.

Why does it matter? You may get it to fit (as obviously a whole lot of people here have) and it may look right, but you don't need to be a tire engineer to figure out you're putting a whole lot of sidewall stress on the tire by fitting it on a wheel that's too narrow. And if you tow (as I do with my '10 F250) you could be asking for all sorts of trouble.

That's definitely trouble I don't need, and although it seems a whole lot of tire shops don't seem to mind that they're fitting the wrong size tire on a rim they sure would care if there was a catastrophic malfunction/failure followed by a wreck...or worse...

That's when the "I read it was OK to do it on the internet" excuse would fall real short in a court, etc.

What will work? For stock 18s the Toyo Open Country A/T 285/75 R18 which, coincidentally, are double marked as 35x11.5 R18. The Open Country M/Ts are also available in the same size, and both tires are Load Range E rated, as they should be. I would not recommend a Load Range D tire on these trucks. That's a step down from stock and will give you all sorts of squirm with load. Not cool.

If you want a legit, unbiased, thoroughly researched and "court defensible" (!) answer to your question, call Tire Rack tech support @ 888-541-1777. They'll tell you exactly what you can (or can't use)...

Hope this helps...
Ronin is right 12.5" wide tires on an 8" rim is not the correct match and not recommended. Even more so with a 20" rim vs. an 18" rim. Having said all that, I was not going to shell out and additional 2K plus for new rims and I like the stock aluminium rims so my combo is 35 x 12.5"x 20" Pro Comp Extreme all terrains on stock 8" x 20" rims and a 2.5" Ikon levelling kit, Firestone aribags and Torklift camper spring extensions in the rear.

I fit a 3000 lb. camper and tow a 7500 lb. boat on this rig and so far it has handled very well. No sway, some pretty rough terrain and tough roads in the wilds of B.C. and I am pretty happy with the results. They may not be the optimal (i.e. 10" wide rim with 12.5" tires), but it isn't far from optimal.
 
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
bigd02244
1994.5 - 1997 7.3L Power Stroke Diesel
4
10-03-2016 07:50 AM
MarkSpillane66
1999 to 2016 Super Duty
1
04-28-2016 09:45 PM
SeabastianMoroe
1987 - 1996 F150 & Larger F-Series Trucks
5
04-20-2016 11:00 AM
Polaris_88
Lightning, Harley-Davidson F-150, Roush F-150 & Saleen F-150
5
05-26-2003 08:00 PM
big block man
Brakes, Steering, Suspension, Tires, & Wheels
1
01-23-2003 07:36 PM


Thread Tools
Search this Thread
Quick Reply: how big of a tire can i fit


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: