Fast Tommy V

I have the Thuren's 3" lift with all the goodies (Trackbar steering stabalizer ect...) on it. I want to run 37" Toyo MTs on 20" Diamo 17 karat on my 06 QC LB CTD. I emailed Thuren and he said that the 37" toyos will be a difficult fit, but not sure about specifics. The Diamo 17 karat rims are 20" x 10" and have a -12mm ofset and 5.03" backspace. Do you guys think this will work on my truck? Is there anything I can do to make them fit if not?

I am not really sure about how backspacing and offset work, but from what I have gathered, I would want less backspace and a higher negative offset to make the wheels stick out more and reduce the chance of rubbing on the control arms. (I am guessing that is where the fitment problems would be) For what its worth, I also have the bushwacker pocket style fender flares installed....

Also is there enough sidewall on the 37" & 20's to maintain offroad performance, or would I be better off running the 18" rims?

Thanks for your help,

Tom

ptgarcia

Won't fit. They'll probably work on the stock wheels, but those Diamos are a definite no-go. While less backspacing makes it easier to clear the control arms, it also makes it easier to rub on the fender, body and bumper. You want the tire as close to the control arm as possible. Even then it's a tight squeeze. Fiberglass fenders may give enough clearance to make them work, but you may have to "message" around the pinch weld.

chipmonk

wheels with 4.5"-5" b/s run the risk of rubbing the rear of the front fender well. with 17x8.5" wheels (5" b/s, +6mm offset), running toyo 35x12.50x17 toyo mt's, with 3 1/2" lift, i just clear the fender well. i think most people who are running 37's without a big lift, go with 5.5" or more b/s, but i'm sure someone who is currently running 37's can tell you how they did it. btw, i don't think a 10" wide wheel, with a 13.50" tire will help your cause any- wider wheel and tire will increase chance of rubbing fender well and control arm.

Fast Tommy V

Thanks for the reply. What are the specs on the stock rims? I am running 35" toyo Mts on the stock rim right now and the stock 17s look borderline too small. Definitley to small on a 37".

So if I understand you correctley, the real problem is not rubbing on the control arms, but contact with the fender/body/bumper under compression. That kind of seems odd to me as there looks like plenty of clearance to fit an extra inch of tire in the fender wells.

If I were to get a taller lift, would those diamo's work with respect to the control arms clearance?

ptgarcia

Turn the wheel to where the tire is closest to the corner of the fender/body. Then turn the wheel the other way to where the tire is closest to the end of the bumper. Can you fit another inch of tire in there?


Stock rims are 17x8.5 with 6.25" b.s. and roughly 41mm offset.

enafzige

As Pauly and others said above, you won't be able to fit that combo.

I just mounted up a set of 37x13.50 Toyo M/Ts on 17x9's with 5.71" backspacing and +18mm offset. I've got the Lorenz 2.25 kit w/ DP leafs, giving about 3" lift front and 1" rear.

Here's what mine looked like when I mounted them up.



Granted, the fender flares reduce clearance by 1/8" or so, but I couldn't even turn the steering wheel a quarter of a turn. A wheel with less backspacing is even going to be worse when you try to turn.

I made mine fit, but it's not something everyone would want to do...







It's kinda tough to see in these pics, but I had to take the fender back 1 1/2" or so to get enough clearance when flexing.



Bob4x4 is running 37's on stock wheels (6.17" backspacing), but even that seems to be hit and miss depending on the truck. Nriver is also running 37's and had to do some trimming/massaging of the fenders.

Your best bet would be to stick with 35's or find some wheels with more than 5.5" backspacing.

--Eric

Fast Tommy V

Thanks for all the help. This is sounding to be too much work then it is worth. Is this something that can be cured with an extra inch or 2 of lift? If so, I can talk to Don and see what can be worked out.

Also, is there any problems with the rear tires fitting?

Tom

ptgarcia

Tom,

The problem is those wheels. They're just all wrong for the application. You're going to need around 6" of lift, maybe more, to clear the Diamos and 37s with no rub.

jamesbfishin

Just give you an idea, this is a pic of a 305/65/17 (32.6 x 12) mounted on a 17x9 with 4.75" backspacing, not much room there. Truck has the Lorenz 2" leveling kit. The 37's with that kind of backspacing will most likely be a problem.

chipmonk

yup...... that's exactly it. i'm trying to remember how many people (including pauly) told me to just get rid of my moto's (4.53" b/s), and get different wheels, when i was having grief fitting my 35" toyo's.

Fast Tommy V

Thanks for the help guys. This is looking like it is going to be way too much trouble to get it to work. I really liked the look of the diamo wheels though. Too bad they couldnt make those rims with better/easier to fit specs. Just out of curiosity, what specs would I need to have the toyo 37" MTs fit the thuren lift with with little/no work?

BlackSunShyne

I have seen people mount the Toyo 37s on the stocker wheels, fit wise it seems to work OK, but I think an 8" wheel is a bit too skinny for a 13.50" tire. It might work with a 9" wide wheel, with close to a 6" backspacing...maybe.