[Kaos Andy]

Does anyone know the ofset of the standard wheels, The speedo seems to read a little low (8km) and it has the stock size tyres. Anyway the tyres are about 15 years old and not much tread. (good year NCT) These were crap when new and now very bad in the wet. Do other model wheels fit without spacers? found a set of 18x8 and 18x9 wheels both 55mm ofset. Might be ok? Or maybe other tyres on orignal wheels??

Many thanks for advice..

Andy

[carguy]

The factory stock Testarossa wheels specs are:
Front: 16" x 8" (inches) Offset 34.2mm (millimeters)
Rears: 16" x 10" (inches) Offset 59.6mm (millimeters)

[Kaos Andy]

Anyone got a pair of rear tyres?

[360 Modena]

Hi Andy,
I upgraded the brakes (F40 Brembo kit) and wheels to 18" on my TR, don't know the offsets. If you jump to 18" wheels, you ought to upgrade the brakes as well IMHO.

HRE Type 547 18" wheel, front fully polished 2 @ $2,908.00
HRE Type 547 18" wheel, rear fully polished 2 @ $3,093.99
Tire Rack Pirelli 235/40-18 PZero 2 @ $424.01
Tire Rack Pirelli 295/35-18 PZero 2 @ $ 598.00
Race-Tech Brembo brake kit 1 @ $7,000.00

[tazandjan]

Andy- Those wheels are an inch too narrow in the rear and will tend to make your TR scarey at the limit. TRs already have a fairly good dose of trailing throttle and power on oversteer with that high CG. You do not want to make it any worse.

The best looking upgrade I have seen for TRs is a set of the OEM 512 TR wheels, which are 18", bolt on, and offer multiple good tire choices.

If you keep your OEM wheels, or upgrade to the 512 wheels, I would recommend Michelin Pilot Sport 2 (PS2) tires if they have the correct sizes.

There are three different wheels for 5 bolt TRs offered here:

http://www.carobu.com/catalog/assets...st_2011-3-.pdf

[360 Modena]

The 3 Piece 19” Trepezzo Racing Wheels look similar to my 18" HRE 547s.

Unless he upgrades to bigger brakes, it will leave a huge void behind 18 or 19-inch wheels and look silly in my opinion.

[tazandjan]

One step at a time. Have to have bigger wheels before you can have bigger brakes. Unless of course, you want to have a car with big brakes on jack stands. The brakes on the 512 TR are not huge at 315 mm F and 310 mm R, and they do not look silly with 18" wheels. The TR brakes are not that much smaller at 309 mm F and 310 mm R.

[Kaos Andy]

Thanks guys,
I really dont like the idea of 9" rears so.
I think the best would be standard replacment rear tyres and sell it and get a 512TR. Maybe?
I do agree it is not fun at the limit with the current NCT goodyear tyres that are old and hard.
Andy

[carguy]

Where are you guys getting this idea of "9 inch rears" from? Mr. 360 Modena's post listed his tire sizes as 235 front and 295 rear, which are about the same as the 512TR tire sizes? Am I missing something?

On my TR I'm running a set of 360 Wheels with 225 fronts and 275 rears. I think it modernizes the look of the car.

[tazandjan]

CG- We read Andy's original post and answered it. 360 wheels are 7.5" F and 10" R vs TR wheels at 8" F and 10" R, like you noted above, so your set-up will tend to increase understeer and lower overall cornering power, but probably not enough to notice. Personally, I would go for wider than stock wheels rather than narrower. Have done that on my V12.

Thanks for the offset info on the TR. Will have to add that to my list. Do you know what it is for the 512 TR and the F512M?

[carguy]

Hi TAZANDJAN....I run 225 wide tires on the fronts, so the contact patch is the same as the original Testarossa tires. Below is the offset information you asked about....

Testarossa:
Front Wheel Size: 16" X 8" (inches) Offset: 34.2mm (Millimeters)
Rear Wheel Size: 16" X 10" (inches) Offset: 59.6mm (Millimeters)

512TR and F512M:
Front Wheel Size: 18" X 8" (inches) Offset: 46.0mm (Millimeters)
Rear Wheel Size: 18" X 10.5" (inches) Offset: 81.75mm (Millimeters)

[tazandjan]

CG- Thanks, I will add them to my list.