[DeTomaso] Tires

Tue Apr 4 00:41:45 EDT 2006

I run about 35 in the front and 30 in the rear.  No real tire wear
problems.  Note, these are street pressures for normal speeds.

Dave "55psi is a little rough riding' D

At 10:06 AM 4/3/2006 -0500, you wrote:
>I'm also running the 335/35-17 rear and 245/40-17 front. What PSI is
>generally recommended for the street (not track). I have tried several &
>really watch for rear wear. I have about 2,200 miles on the set & no
>noticeable wear. Dave "Michelin Pilots" M
>
>-----Original Message-----
>From: Dave Doddek [mailto:pantera at pobox.com] 
>Sent: Sunday, April 02, 2006 11:40 PM
>To: detomaso at realbig.com
>Subject: Re: [DeTomaso] Tires
>
>I have the 335-245 combo with stock sway bars and the car actually runs
>pretty well. Little understeer but not bad.  I have also not had any
>unusual wear problems on the rear.  In fact, I have went through 2 sets of
>fronts to one set on the rear.  I am now about ready for new tires all
>around and wondering what I will buy since the MXX3 is no longer made.
>
>Dave "yes, tires are expensive" D
>
>At 01:30 AM 4/2/2006 -0500, you wrote:
>>I don't think there's a simple answer to this question.   I did an 
>>analysis of other high performance cars as to their front to rear 
>>weight ratios, tire width ratios, car weight, and horsepower, and 
>>concluded that something like 285 rear and 215 front were probably what 
>>would be fitted if the car were being made today.  So I'm running those 
>>sizes on 10 and 8 inch wheels with the same offsets as Campies of those 
>>widths.
>>
>>Most people get 335/35-17 rear and 245/40-17 front (although it seemed 
>>that the cars i saw at PI had 225 fronts), mainly because they like the 
>>look of the rear 335's.  There are problems with that:
>>
>>335 is too wide for an 11" rim. Yes, it will fit, but it makes the tire 
>>wear in the center very fast unless you run it at very low pressure 
>>(mid-20's).
>>
>>The extra 1" of rim width of an 11" compared to a 10" is all inboard, 
>>which moves the tire quite close to the suspension and body metal.  
>>Since this also narrows the track, the extra tire width is of less 
>>benefit than it would be if the width were outboard.
>>
>>The 335-245 tires are WAY more expensive than the 285-215, partly 
>>because you are very limited as to choice.  Since tires are technically 
>>only good for 7 years, it can add up after a while.
>>
>>Wider front tires means heavier steering.
>>
>>Those wide rear tires mean the car will understeer more.  I believe the 
>>GTS cars had 285 rear, 225 front tires and were pretty well balanced 
>>with the 7/8" rear bar.  So obviously if you add another 50mm to the 
>>rear and only 20 to the front in tire width, you're upsetting the 
>>balance toward understeer in a big way.
>>
>>If you use all the cornering power of those wide tires, you'll 
>>DEFINITELY put way more torsional load on the car than it was designed 
>>for, and you'll crack the body.  Whether the various body stiffener 
>>kits will prevent this, it's too early to say.
>>
>>Some racers like the 335 rears because it keeps the rear planted, which 
>>I'm sure I'd want to at high speed. But those cars have also been 
>>dialed in with special springs and shocks, body stiffening up the 
>>wazoo, etc, etc.  So I'm not sure it means much to those of us with 
>>otherwise stock suspensions.
>>
>>I totally respect the viewpoints of those who love the look of the 
>>335's, but thought I'd post another opinion.
>>
>>Donning my flame suit,
>>
>>Jim
>>
>>
>>
>>
>>
>>
>>
>>
>>-----Original Message-----
>>From: MikeLDrew at aol.com
>>To: jmontero at fcmat.org; detomaso at realbig.com
>>Sent:   Sat, 1 Apr 2006 21:06:03 EST
>>Subject: Re: [DeTomaso] Tires
>>
>>
>>In a message dated 4/1/06 17:05:31, jmontero at fcmat.org writes:
>>
>><< For a stock, narrow bodied
>>car with 17" rims front and back, what are the most common tire sizes.
>>I am assuming that the rears are 335/35/17.  What are the fronts?  >>
>>
>>>>>You want a 245/40-17.  Not all makers have a 245 tire that short.
>>Whatever you do, do NOT get a 245/45-17.  It will be substantially 
>>taller than
>>your
>>rear tire and will really look weird.
>>
>>Cheers!
>>
>>Mike
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