Aftemarket wheels and tires for roadracing

[pwpanas]

Originally Posted by JPDsupra

Which are the most lightweight wheels available on the market. There are some carbon fiber wheels from Dymag which weigh 14lbs but ive heard there are lighter wheels on the market?

As strange as this sounds, and for what it's worth, I'd recommend that you should not use weight as your primary criteria for rim selection. Imho, rim width is far more important, for an MKIV Toyota Supra Turbo (especially one that has been, or will soon be, upgraded). As you know, the Mkiv Supra Turbo, generally speaking, is a high-horsepower rwd vehicle, and the wheels that need to be on this type of vehicle need to be appropriate for that design. The widest rim that will fit on the oem Mkiv Supra body (jza80), without modification, and with the correct offset, is 11.5" wide. This will allow you to run 315s, which will actually have a chance of 'hooking up' all of that horsepower. If you go and (for example) put some skinny 9" wide rims on the car, you'll just sit there and spin, even at modest 'bpu' horsepower levels. In other words, lighter rims can make you slower (not faster) if they're an inappropriate width. Now, the trouble is that if you limit your wheel/rim brand/model selections to those you can get in an 11.5" width, you'll find it to be somewhat limited. A few of the brands I'm aware of that do come in that width are Fikse, Forgeline, Kinesis, CCW, and HRE. Although I personally have no experience with "Dymag" carbon-fiber rims, it's probably unlikely that they come in an 11.5" width...

Of course, after you do find a few choices for 11.5" width rims, with the correct offsets for the jza80, and rims strong enough for your application, weight can & should be one of the criteria that you use to select among them. Just mho fwiw, and ymmv...

[JPDsupra]

thanx but i know the thing about width and traction and how skinny tires can make you slow but i was just wonderin what were the most lightweigt rims

[pwpanas]

Originally Posted by JPDsupra

thanx but i know the thing about width and traction and how skinny tires can make you slow but i was just wonderin what were the most lightweigt rims

Fwiw, I've heard that magnesium wheels are among the lightest, although generally not ideal for street use. Apparently the magnesium alloy, although very light, also tends to be brittle and will (for example) break/crack rather than bend if you hit a pothole too hard.
http://www.buywheelstoday.com/images_products/1279.jpg

Unfortunately, I doubt that these Enkei magnesium rims (or any ultra-light magnesium rims) are available in the correct width/offset combo for the jza80 chassis.

Update: I've heard that Forgeline and iForged also have ultralightweight magnesium rims. Since I know Forgeline does make an 11.5" wide rim, this might be an optimal choice for overall performance (if their magnesium alloy rim is available in that width).