Helium Wheels coming soon

  • New Design 18x10.5” wheels less than ~19 lbs…
  • Reduce weight by ~3 lbs per wheel vs Custom Machined Wheels
  • Lightest weight 18” wheel >= 10” width on the market

Wheel width = Grip

Every major circuit racing series has moved to wider front wheels in an effort to increase grip and reduce track times.  The only exception has been Formula 1, which reduced front wheel width in an effort to reduce grip and slow down the cars.  In 2012, DTM increased front wheel diameter from 11 to 12” wide.  A few years before that, Super GT moved from 12” to 13” wide wheels.  More recently several LMP1 cars moved up to 14.5” or 14.75” while maintaining a narrower 14” or 14.5” in the rear.  Who would have thought that top racing teams would have wider front wheels than rear on a rear wheel driven car.  This goes to show that front grip and braking capability is just as important as rear drive grip.  Over the past several years, the Porsche GT3 RSR has evolved from 11” to 12” and now 12.5” wide wheels.  In 2011 the 458 GT jumped to 12.5” from 11.5” front wheels.  From 2009 to 2011, all of the top time attack teams had 10.5” wheels, in 2012 all the records are falling on 11” wide wheels.  No one has seemed to find the law of diminishing returns, wider wheels equal more grip, better braking, less under steer and faster laps times.

1” of extra wheel width is worth ~ 1 sec per min of track time

Over the last decade the Miata racing scene has followed this trend of plus sizing their front wheels.  At first the fastest Miata’s where running 7” wide wheels.  When 8” wheels broke onto the scene many thought they would be too heavy, soon however, the fastest Miata’s were all on using 8” wheels.  When 9” wheels became available, doubt again set in about the weight penalty.  Within a year, all of the top Miata teams where running on 9” wide wheels.  Today, many are fitting 10” wide wheels on Miata’s and despite their lower engine torque, times are dropping further.

There does not seem to be a law of dimensioning returns as each extra inch of wheel width is worth roughly one second per one minute of track time.  For example on a track like Buttonwillow CW13 where competitive laps are around 2 minutes, you should see around a 2 second improvement.   Each extra 1” provides an increase in mechanical grip that improves both low speed as well as high speed grip.  A +1” in wheel width provides a similar improvement to moving up in tire classes, like an Extreme tire to R comps or R comps to Slicks.  Again the extra grip gained more than compensates for the increase wheel and tire weight.

18 x 10.5” GRIP wheels mounted with 265/35 tires; Maximum front end grip & response

Match your tires with a slight stretch

Another thing to consider is tire width.  Many people believe that wider tires improve grip.  However, this is not true.  You need to fit your tires to your wheels so they have a slight stretch.  Fitting the widest tires possible on specific wheel sizes will deaden response and cause the car to roll due to unsupported sidewalls.  Additionally this will decrease the performance and function of your dampers as you introduce a major damping mechanism into your system.  Extra tire width is not used as the tire is pinched; creating a muffin top close to the wheel lip that is not in consistent contact with the ground.  It’s important to note that none of the racing series above use tires that are wider than the wheels.  Every team has their tire widths matched to the wheel width.  On TV you will noticed a slight stretch of the tire as the wheel is slightly wider than the tire.

Good Fender clearance (+30mm front fender) with maximum stance

S2000 Fitment & Experience

URGE designs has experimented with multiple sets of 10.5” and 11” CCW’s to get the offsets and backspacing perfect for the S2000.  With little to no front fender modification you can run 9.5” front wheels with 245mm tires.  For S2000s that visit the track more often we recommend 10.5” wide front wheels mounted with 265mm tires.  You’ll need to modify the front fenders with a big flare or replace them with at least 25mm+ over fenders.  If you’re willing to go all in with 11” wheels, we recommend that you have at least +50mm front fenders and +25mm rear fenders and suggest running 295/30 tires

 

WHY 18” wheels?

For one, the 18” diameter compensates for the extra backspacing needed to fit 9.5”+ wide wheels, avoiding A-arm contact.  Also, 18” wheels have the optimal sidewall width as well; 35 series on 245-265mm and 30 series on 295mm+.  These tires tend to have the right amount of grip to stiffness ratio, bending enough to grip and stiff enough keep an optimal tire contact patch.  Also, the fastest circuit series in the world all use 18” wheels; Lemans prototypes, Super GT, DTM and FIA GT.  Yes, 18” tires have a 20-30% premium over 17”, but we feel the tire premium is worth the grip provided by the extra wheel width and optimal sidewalls.  More consistent grip can also improve tire longevity by providing more even wear and less overheating.

Grip Wheels

$3200

  • High Strength Aluminum Alloy
  • 19-22 lbs depending on Width and Spoke Design
  • Forged & Machined 1 Piece Design
  • Maximum BBK Clearance; Clears All S2000 BBK
  • Clears A-arms up to -2.5 degrees Camber

Helium Wheels Coming Soon

$TBD

  • 6016 T6 Aluminum Alloy
  • 8-16.3 lbs via Extreme Weight Optimization

18 x 9.5” Front and Rear

$ – email for quote

  • Designed for use with stock fenders

18 x 9.5” Front & 18 x 10.5” Rear

$ – email for quote

  • Designed for use with stock fenders

18 x 10.5” Front & Rear

 $ – email for quote

  • Designed with +30mm front over front fender or fender pull, OEM rear fenders fit

18 x 11” Front & Rear

 $ – email for quote

  • Designed for use with a minimum +50mm front & +25mm rear over fenders

Ask about custom wheel finishes

$200 – $400

Recommend Tire Sizes

  • 245/35 on 9.5”
  • 255/35 on 10”
  • 265/35 on 10.5”
  • 295/30 on 11”

We are more than just products on a website, reach out to us with any inquiries, ideas or suggestions.

URGEdesigns@gmail.com